Minty Mobile BBS | Meshtastic | Page 1

indigo oasis Sep 16, 2025, 4:20 PM

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Trying to build a node that runs a small BBS service to link two unconnected meshes. The goal is for it to be battery operated and contained in an altoid mints tin case

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The proof of concept is very much #notabomb candidate. Using a raspberry pi 3, seeed xiao s3 sx-1262 and 22500 mAh battery bank I had lying around. The bbs is fork of Hops https://github.com/booyaa/Hops

GitHub

GitHub - booyaa/Hops: Hops is a Meshtastic bot that responds to dot...

Hops is a Meshtastic bot that responds to dot commands. - booyaa/Hops

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I’ve just ordered a USB shim so I can plug the radio into a pi zero. We can look at proper battery UPS later on.

tacit heath Sep 17, 2025, 4:55 PM

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This is awesome!

indigo oasis Sep 17, 2025, 4:57 PM

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To be honest, I think I might have been inspired you or someone else 😆 definitely someone with a pi zero and radio.

tacit heath Sep 17, 2025, 4:58 PM

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There's a few around 😉

molten zenith Sep 17, 2025, 6:28 PM

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Forgive my ignorance, could you get it to send a message when it see's a node like "You have just passed Meshtastic9I03! See you later!" So passers by know that they have been in the vicinity of you?

indigo oasis Sep 17, 2025, 6:41 PM

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Could do, something but more passive is to set your long name. I’m reluctant to spam. Also noticed most mesh BBSes require you chat to them via DM rather than spamming the channel. I’ll probably set the long name as a hint it’s a BBS

tacit heath Sep 17, 2025, 8:04 PM

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molten zenith Forgive my ignorance, could you get it to send a message when it see's a node li...

Meshing around has a proximity sensor module

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basically watching position data to see if a node enters a particular place

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I had ideas for a treasure hunt using it

molten zenith Sep 17, 2025, 8:05 PM

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tacit heath basically watching position data to see if a node enters a particular place

That’s cool thanks. Also that’s tonight’s rabbit hole.

tacit heath Sep 17, 2025, 8:06 PM

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Yes, we have an entire field of rabbit holes.

molten zenith Sep 17, 2025, 8:07 PM

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tacit heath Yes, we have an entire field of rabbit holes.

Step 1. Find some hardware in the ‘hardware drawer’
Step 2. Start reading.

indigo oasis Sep 17, 2025, 8:10 PM

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This my favourite bit, under powered computers finding a new use as the brains for radios. I would love to do this in a Linux native form or even a custom firmware with the bbs on a mcu device.

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I seem to think that spuds meshing around and tc2bbs have the ability to sync with other BBS nodes. That appeals to me. Especially if said nodes are linked via MQTT

tacit heath Sep 17, 2025, 9:25 PM

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indigo oasis I seem to think that spuds meshing around and tc2bbs have the ability to sync wi...

yeah, we had big ideas at the end of last year for syncing mesh nodes, so the limits of the mesh protocol didn't limit the reach of the messages.

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there's still time for 2025 to be the Year of the Linux Node 😉

indigo oasis Sep 18, 2025, 7:59 PM

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Just got a USB shim (I would’ve bought the UPS but it lost out to the new RTL-SDR). Got an enclosure upgrade! #notabomb one of the boxes that my Heltec v3

tacit heath Sep 18, 2025, 8:02 PM

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Oh, that's a usb shim! I didn't know what that was called.

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Honestly, I have so many adaptors I could probably connect anything to anything.

indigo oasis Sep 18, 2025, 8:07 PM

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Probably super cheap at alib https://thepihut.com/products/usb-to-microusb-otg-converter-shim

The Pi Hut

USB to microUSB OTG Converter Shim

Possibly the perfect accessory for Raspberry Pi Zero hackers? This tiny little shim slots inside a full-sized USB connector and transforms it into a USB-On-The-Go compatible micro-USB connector. (USB Male to Micro USB male)

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The usb is too chunky though won’t fit the minty tin. I’ll have to see if I can do serial over the gpio. I wonder if can talk to the Meshtastic API over gpio? I suspect might need to use the serial module

tacit heath Sep 18, 2025, 8:45 PM

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It may be time to consider a hat.

indigo oasis Sep 27, 2025, 12:53 PM

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Bought a UPS hat. I think the pogos aren’t connecting well because the i2c battery monitoring isn’t working. Might try working up manually to GPIOs to verify it’s not a dodgy board. Seriously thinking about decoupling the Wio SX-1262 from the ESP there’s enough examples of pinouts in meshtasticd this would save a lot of battery usage and avoid this unseemly cable

indigo oasis Sep 28, 2025, 8:48 PM

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indigo oasis Bought a UPS hat. I think the pogos aren’t connecting well because the i2c batte...

Fixed the i2c, dropped the pi and the hat on the floor and that seems to have caused the data pogos pins to make contact with the pi. Lol


Load Voltage:   3.728 V
Current:       -0.485 A
Power:          1.807 W
Percent:       60.7%

tacit heath Sep 28, 2025, 9:39 PM

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indigo oasis Fixed the i2c, dropped the pi and the hat on the floor and that seems to have ca...

Percussive maintenance

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https://tenor.com/view/monkey-badum-tss-drum-joke-unimpressed-gif-7770998

Tenor

indigo oasis Sep 29, 2025, 11:22 AM

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Really need to get this sx-1262 wired up to the pi directly. When it’s used with the ESP MCU via USB it can drain a 1000 mAh in less than 3 hours. Just doing a test without it plugged in I’m about to go pass 3 hour mark and there still over 50% battery capacity. (1 cpu core and no hdmi). Those ESP are very power hungry ( this is a known fact tho)

tacit heath Sep 29, 2025, 11:42 AM

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indigo oasis Really need to get this sx-1262 wired up to the pi directly. When it’s used with...

Yeah. You want a hat?

indigo oasis Sep 29, 2025, 11:43 AM

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tacit heath Yeah. You want a hat?

What like a protoyping hat?

tacit heath Sep 29, 2025, 11:44 AM

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Yes. Might have something incoming soon™

indigo oasis Sep 29, 2025, 11:44 AM

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Ooo yes please. Will there be soldering involved?

tacit heath Sep 29, 2025, 11:44 AM

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Only if you want.

indigo oasis Sep 29, 2025, 11:46 AM

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I’ll give it a miss, I haven’t done it for decades. I’d like to do it again but this stuff is so small I think I’d struggle to get the on done

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I take it this has happened because so many people keep asking which pi hat they can use?

tacit heath Sep 29, 2025, 11:48 AM

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Yes. There's not much about ATM, although I have it on good authority that there are "things in the works."

indigo oasis Sep 29, 2025, 11:48 AM

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Sweet

tacit heath Sep 29, 2025, 11:48 AM

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But yeah, I need to bang out a DIY design anyway, to scratch an itch.

indigo oasis Sep 29, 2025, 11:48 AM

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Excellent I will keep an eye out!

indigo oasis Sep 29, 2025, 1:38 PM

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indigo oasis Really need to get this sx-1262 wired up to the pi directly. When it’s used with...

4:41 hours without the power hungry xiao hanging off the end. 2 extra hours on a 1000 mAh battery

a very noddy data logger: watch -n 60 'echo $(date +"%F %H:%M:%S";uptime -p) >> uptime.log'

sand zenith Sep 30, 2025, 2:14 PM

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tom has pointed me at this thread because i am about to start making a pi node :p

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~5h on 1000mah is promising given i plan to put ~6000mah in

indigo oasis Sep 30, 2025, 2:16 PM

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Yeah my ups hat (c) looks like it’ll only take 1000 mah of you want it to fit the footprint of the pi zero. If you don’t mind a bigger battery hanging outside then you’re golden

sand zenith Sep 30, 2025, 2:18 PM

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#enclosures-discussion message so much room for activities

indigo oasis Sep 30, 2025, 2:23 PM

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Yeah I might have painted myself into a corner because I want it to fit a mint tin. I think I still can well see. If I can just use the radio rather than have an esp I can work with ~5 hours. Especially if I pair down the OS and use rust for the BBS software but that’s just yak shaving at the moment

indigo oasis Sep 30, 2025, 3:12 PM

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Inspired by mesh-bbs high ferric content I wanted to pull data from ups-c hat ina219 using rust. I hope to add this as a patch so the BBS carps about low power and then shutdowns gracefully https://gist.github.com/booyaa/5cf18e66b41e96ffba920c405c8414c0

Gist

Poking the INA219 battery monitor using something rusty

Poking the INA219 battery monitor using something rusty - hello-battery.rs

tacit heath Sep 30, 2025, 3:45 PM

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indigo oasis Inspired by mesh-bbs high ferric content I wanted to pull data from ups-c hat in...

The Linux native fw should be able to read the INA directly, but it doesn't get used as battery voltage yet, I think

tacit heath Sep 30, 2025, 3:45 PM

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indigo oasis Yeah I might have painted myself into a corner because I want it to fit a mint t...

What I like about the pi format is that it's ~business card size

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I have a project box that holds a huge number of business card boxes, and it's handy to be able to sort my unfinished business.

indigo oasis Sep 30, 2025, 3:48 PM

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Yeah I’m waiting for someone to do a DIY Meshtastic tracker using CM and crazy internal antenna using PCB shenanigans (probably impossible)

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Mind you it’s always the battery that’s gonna kill your builds practicality

tacit heath Sep 30, 2025, 3:51 PM

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indigo oasis Mind you it’s always the battery that’s gonna kill your builds practicality

So when we did tests on the Femtofox, it draws 0.3-0.5W

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Idk if there's much you can squeeze out of the pi0, but 1W sounds about right.

indigo oasis Sep 30, 2025, 3:54 PM

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Yeah I need to buy a proper reader will probably do once the main build is finished. Would like to be specific

tacit heath Sep 30, 2025, 3:55 PM

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Fnirsi

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Is a good one

indigo oasis Sep 30, 2025, 3:56 PM

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Is Femtofox is based on a micro controller rather soc? (not that I know the difference asides a pi can run an OS where as pico can do one thing). I seem to think someone has shoehorned Linux on a pico calc

tacit heath Sep 30, 2025, 4:00 PM

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indigo oasis Is Femtofox is based on a micro controller rather soc? (not that I know the diff...

Yes, Femtofox uses a luckfox Pico mini, which has an rv1103 soc, which just about runs python

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The Pico calc works with a luckfox Pico not-mini

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Although I'm not sure if Mark productionised his build

indigo oasis Oct 7, 2025, 11:13 AM

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Noticed that the radio USB connection kept dropping (the radio has its own MCU so appear active) . This meant the BBS stopped working. Turns out one of the USB cables must be causing electro magnetic interference (EMI). I’m blaming USB cable charging the UPS (plugged into yet another Pi). I’ve switched the USB cable to a dedicated socket on my extension cable and also stuck the Pi back in its travelling box. Never seen this before. I’ll have to find out the best way to shield the pi because once the Pi’s hub disconnects the device you can only resolve using a reboot.

spice dew Oct 7, 2025, 1:40 PM

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Setup a watchdog to reboot if PID is lost

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Or if tty lost

indigo oasis Oct 7, 2025, 2:04 PM

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Good idea thanks!

indigo oasis Oct 8, 2025, 8:08 AM

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Getting a little epaper screen today and more importantly some m/f jumper leads. Hoping to wire up the sx-1262 directly to the Pi (well via a bread board) this should hopefully mean a longer battery life.

indigo oasis Oct 8, 2025, 10:53 AM

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After a bit of jiggery poker I got my epaper display to work! Now time to write some helper to make it easier to display things on it. This is the demo app

indigo oasis Oct 8, 2025, 4:01 PM

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Minty Mobile BBS

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Spent the afternoon wrassling with pillow (pil’s successor). The mesh related stuff in place holder text but the rest is coming from the pi. I think I might need one of those IDE cables because the height of the pi plus ups and display hats is pretty tall now. Also need to wire the radio! That USB cable is causing all kinds of EMI.

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I’m gonna make a sleep screen so when the pi has been shutdown it’s on display with a QR contact or something.

sand zenith Oct 8, 2025, 4:06 PM

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nice!

indigo oasis Oct 8, 2025, 4:19 PM

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Thanks I love this ePaper/ink display especially since it stays on even when the pi is off !

spice dew Oct 8, 2025, 4:46 PM

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I got one of these somewhere

indigo oasis Oct 9, 2025, 3:36 PM

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Testing a new workflow to work on epaper graphics offline because refreshing the display can take up to 50s on a pi zero 2 https://github.com/booyaa/hello-waveshare-epaper-display/blob/main/README.md#creating-new-graphics-without-an-e-paper

GitHub

hello-waveshare-epaper-display/README.md at main · booyaa/hello-wa...

Waveshare e-Paper Display Experiments. Contribute to booyaa/hello-waveshare-epaper-display development by creating an account on GitHub.

tacit heath Oct 9, 2025, 4:49 PM

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50s? Oof....

sand zenith Oct 9, 2025, 4:51 PM

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huh? monochrome eink refresh is usually pretty quick

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and their table says 2s refresh

sand zenith Oct 9, 2025, 5:50 PM

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oof i'm seeing about 350mA on my pi zero 2 now with wifi up

indigo oasis Oct 9, 2025, 6:36 PM

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You can expect between 100 mA idling to 500 mA when all four cores are running. I really should’ve got that usb metre to get real readings. Pretty certain my UPS gives various power readings I know it tells me volts 😂

sand zenith Oct 9, 2025, 6:37 PM

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that was battery current off ina, so probably a bit lower 5v current

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maxcpus didn't seem to really change it, though, so not sure

indigo oasis Oct 9, 2025, 6:38 PM

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Should do according to Jeff https://www.jeffgeerling.com/blog/2021/disabling-cores-reduce-pi-zero-2-ws-power-consumption-half

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But as I’ve found out stuff can sometimes act weird on one core (MeshBBS needs at least 2 cores)

spice dew Oct 9, 2025, 6:45 PM

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So it can play doom? Or Tetris could be played at tea time 🫖

indigo oasis Oct 9, 2025, 6:45 PM

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Yeah I’m pretty certain someone has run doom on it. And made a minty box version

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Ah no it was the pico 🤣

indigo oasis Oct 10, 2025, 2:11 PM

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Need to wire this up to run before shutdown

indigo oasis Oct 11, 2025, 11:09 AM

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Not a mint box per se but I think it’s of a similar size. Time to see if it fits. I’m hoping I can do something clever with the display like sticking it on the lid. Need access to the pins for the radio otherwise I’d have left it as is

tacit heath Oct 11, 2025, 11:15 AM

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Remember a raspi is only 2mm wider than a standard business card

indigo oasis Oct 11, 2025, 3:20 PM

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Just a quick fit test nothing actually wired up. The screen or the UPS have to be detached a wired differently non hat or pogo pins. But it “fits”

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It will close if I remove either the display or ups. I could
Dremel the tin lid to make space for the display but it feels like cheating

indigo oasis Oct 13, 2025, 9:04 AM

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Really need a proper usb meter but according to the ina219 on ups hat I’m drawing 891 mAh irrespective of if I’m on 1 or 4 cores on the pi zero 2. I suspect Jeff’s measurements are way more accurate. The seed xiao is drawing over 500 mAh on top of just the pi.

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The ina219 is telling porkies cause I’m getting at least 2 hours with the radio on

tacit heath Oct 13, 2025, 10:49 AM

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indigo oasis The ina219 is telling porkies cause I’m getting at least 2 hours with the radio ...

Is it definitely a 100mohm shunt?

indigo oasis Oct 13, 2025, 11:31 AM

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How would I know? Presumably in the spec of the hat? Not really sure where to look https://www.waveshare.com/wiki/UPS_HAT_(C)

UPS HAT (C)

sand zenith Oct 13, 2025, 11:32 AM

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are you reading it yourself or from meshtastic

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schematic says 0.01R, which is 10 mohm

tacit heath Oct 13, 2025, 11:33 AM

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Oof

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Yeah, 90 mA sounds better than 900

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And 60 Vs 600

indigo oasis Oct 13, 2025, 11:58 AM

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Reading it myself using the i2c python script provided by wave share

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I’ll know who’s tell porkies when I get that meter. I like the rust interface cause it auto converts from Ah to mAh but both (rust and python) scripts are giving different current readings so taking it with a pinch of salt

sand zenith Oct 13, 2025, 12:04 PM

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mA (instantaneous current) or mAh (which is a charge unit) ?

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the python script looks sensible

indigo oasis Oct 13, 2025, 12:32 PM

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Cool thanks, still finding my way around this stuff

indigo oasis Oct 13, 2025, 3:00 PM

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Okay time to stop fannying around and try wiring up this Wio sx-1262 from my seeed xiao kit to the pi. Took a photo of the underside of the board I’m assuming these are the pin assignments. I’ll find the recommended meshtasticd configs that were suggested in #meshtasticd

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Immediately distracted but I think I can use this cable that came with my display to reposition my e-Paper display! There’s an alternate port I’m assuming for non 30 pin raspberry pies

indigo oasis Oct 16, 2025, 1:14 PM

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Damn I think I might have fried my display. My gpio hat go plugged in off by one. I’m assuming I might have exposed the odd pins for the hat to 5v (which is on the even pins on the pi)

indigo oasis Oct 16, 2025, 3:37 PM

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Good news the raspberry pi spi isn’t dead. Found this neat tool, compile it and join mosi (pin 19) and miso (pin 20) to make a loop back. So long as everything gets echoed back you’re golden https://github.com/rm-hull/spidev-test?tab=readme-ov-file

GitHub

GitHub - rm-hull/spidev-test

Contribute to rm-hull/spidev-test development by creating an account on GitHub.

tacit heath Oct 16, 2025, 3:39 PM

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indigo oasis Good news the raspberry pi spi isn’t dead. Found this neat tool, compile it and ...

Well, golden or have other problems ..

indigo oasis Oct 16, 2025, 3:40 PM

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lol nothing like a bit of random

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Well random to me, bleeding obvious to a electrical engineer

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As an eternal optometrist gonna try the 8 cable connector. In the hope that I only burnt out the gpio hat side 🤣

indigo oasis Oct 16, 2025, 4:05 PM

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https://tenor.com/view/spongebob-rip-sad-sponge-bob-stephen-hillenburg-crying-sponge-bob-squidward-gif-14099323662606620303

Tenor

tacit heath Oct 16, 2025, 4:16 PM

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Not good news?

indigo oasis Oct 16, 2025, 4:35 PM

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Fraid not

tacit heath Oct 16, 2025, 4:36 PM

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Oh dear.

indigo oasis Oct 16, 2025, 4:37 PM

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It wasn’t very expensive just annoyed first time I’ve fried something

sand zenith Oct 16, 2025, 4:37 PM

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yeah i fried one of my brand new radio hats plugging it in wrong while it was on >_>

indigo oasis Oct 16, 2025, 4:38 PM

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Oof

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Also something I learnt about my ups is that you want to keep it off (it’s got a proper off switch) so there’s no way power can come through. I think plugging in a hat is enough to wake a shutdown pi if you’ve got the ups / battery pack plugged in. Still error on my part for plugging in wrong, but having your pi go on randomly as you’re plugging in stuff is probably not good

indigo oasis Oct 22, 2025, 1:42 PM

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If you’re using Debian you know how old some version of software can get (unless you’re on testing). Useful repo with useful tools especially for raspberry pis https://packages.azlux.fr/

spice dew Oct 22, 2025, 1:51 PM

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Also if you haven’t seen https://pi-apps.io/about/

Pi-Apps - About

Raspberry Pi App Store for Open Source Projects.

indigo oasis Oct 22, 2025, 1:51 PM

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Ooo no that’s a new one on me!

indigo oasis Oct 22, 2025, 5:03 PM

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Egads that took a long time to get round to doing. Testing a “watchdog” script to shutdown the BBS if we’re about to run out of juice. It’ll eventually send out a message on the channels it’s watching and be wrapped up as a systemd service

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lol I really should rewrite the code to use the python libs, but I really love standalone binaries. Doesn’t make sense if you’re wrapping them in a python subprocess

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tacit heath Oct 22, 2025, 5:20 PM

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indigo oasis

Isn't systemd the modern way? I'm so confused

indigo oasis Oct 22, 2025, 5:37 PM

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Kinda want the bbs to be the sole systemd service should make it easier to install

spice dew Oct 22, 2025, 5:53 PM

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Assembly writers feel the same about Borland logo_ukpython

indigo oasis Oct 22, 2025, 6:07 PM

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I like to strike wires to push bits around the pi

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I think turbo pascal was my first compiler. Everything else was interpreted before then

indigo oasis Oct 25, 2025, 5:05 PM

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So my new kit arrived the usb dongle thing is a male (needed a female to connect my xiao s3 lora) and the usb-c uart (on the gpio) does want to play nice with my usb-c cable. I think this might be a seeedio xiao issue though

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I only needed one of them to work

tacit heath Oct 25, 2025, 6:29 PM

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indigo oasis So my new kit arrived the usb dongle thing is a male (needed a female to connect...

What's going on in this stack?

indigo oasis Oct 25, 2025, 6:45 PM

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I just stacked the usb-c connector so I could have them in the same shot. Id prefer to use the usb one which looks like it reroutes the pi usb mini data to the other side cause it keeps the stack height low.

tacit heath Oct 25, 2025, 6:53 PM

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What are the different adaptors? Serial to usb?

indigo oasis Oct 25, 2025, 6:54 PM

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The usb-c is serial and power https://thepihut.com/products/adafruit-piuart-usb-console-and-power-add-on-for-raspberry-pi

The Pi Hut

Adafruit PiUART - USB Console and Power Add-on for Raspberry Pi (Mi...

Here's another super handy add-on for your Raspberry Pi computer, perfect for 'head-less' setups! The PiUART adds a USB Type-C to serial connection so you can use any serial port software to connect to the Pi's console. It plugs in and is fast and easy to add whenever you need to connect to your Pi. Two LEDs connect to RX and TX on the serial co...

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I’m just looking to not have a big usb (plus usb mini shim) sticking out of the side which make it’s impossible to fit in a mint box.

sand zenith Oct 25, 2025, 7:01 PM

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ooh

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i made one of those myself 😂

tacit heath Oct 25, 2025, 7:02 PM

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indigo oasis The usb-c is serial and power https://thepihut.com/products/adafruit-piuart-usb-...

This looks interesting

indigo oasis Oct 25, 2025, 7:59 PM

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Yeah other device is just too chunky and gets in the way of the ups. Oh well. Gonna just need to go for a slightly bigger case. Might be able to get a flat or L shape usb to usb c data cable to reduce the protrusion. But to be honest I just need a bigger case. Here’s the other dongle https://thepihut.com/products/solderless-zero-dongle-for-raspberry-pi-zero

The Pi Hut

Solderless Zero Dongle for Raspberry Pi Zero

Connect your Raspberry Pi Zero directly to your computer for use as a USB Gadget device (USB Ethernet / Serial / Ethernet+Serial / etc.) or just for power without any soldering!

tacit heath Oct 25, 2025, 8:12 PM

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There's really no easy way to hook up a pi, is there?

indigo oasis Oct 25, 2025, 8:12 PM

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This is the best I can do for now. Might go for a long cable so I can get a proper antenna on the side of the box . Yeah not unless it’s custom jobby

tacit heath Oct 25, 2025, 8:14 PM

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I've got an expander board that turns a pi zero into a pi4 layout

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Quite nifty

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The micro usb annoys me more than I remember

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I didn't used to mind them, but I've been spoiled with decent connectors.

indigo oasis Oct 25, 2025, 8:17 PM

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It definitely annoys a lot of people I’ve seen lots of designs to replace the data port with a full sized usb lol

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I love the pi zero form factor I think you’re golden if you can either use pogo pins and the gpio. It gets ugly when you have to use those infernal usb ports

tacit heath Oct 25, 2025, 8:26 PM

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Will it run ok off 3.3v?

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Just doing some mental arithmetic.

indigo oasis Oct 25, 2025, 8:56 PM

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Is the pi? TBH honest I’m not sure. The ups hat’s pogo pins covers the first 6 pins so that could be 3.3 or 5v. I really do like that use of the pins though. Keeps your gpios free for one more board like a fried epaper display 😭

indigo oasis Oct 27, 2025, 8:28 AM

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Rev 1 - ups hat (1000 mah battery, seeed xiao lora starter kit and stubby from a heltec v3 (which is my base node that got a recent antenna upgrade).

indigo oasis Oct 27, 2025, 3:02 PM

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Good news I didn’t fry my paper display. I think installing MeshtasticD may have clobbered the existing SPI bindings. I had to start with a new OS as part of the troubleshooting process with waveshare and that’s when I worked out what happened

#Minty Mobile BBS