ELRS PMW Receiver Wiring Issues | ExpressLRS Community | Page 1

quasi imp Oct 23, 2023, 4:06 AM

#

So I'm building a 3D printed rc boat, and decided to buy an ESLR controller (TX12MKii ELRS) so that I can later use it when I make an FPV drone. I'm using some emax eco II motors each connected to a HGLRC 30A ESC (https://www.amazon.com/dp/B07GTHDGCK), and because they have PMW pins, I decided to get the BetaFPV Micro ELRS Receiver, but that has been causing some problems. I plugged the ESC's black and white output into the receiver channels but the receiver LED hasn't turned on at all. I checked the 5S battery voltage which read 19v, and then each ESC had 3.2V, which is lower than the receivers 5-9V range. I'm thinking this could be the trouble, but I don't know a workaround or even if I'm wiring the ESCs to the receiver correctly. Thanks for the help, this is my first RC project and I'm very excited!

TLDR: I think insufficient voltage or incorrect wiring from the ESCs to the receiver is making the receiver LED not blink and unable to be powered up to pair to my transmitter.

main juniper Oct 23, 2023, 4:15 AM

#

quasi imp So I'm building a 3D printed rc boat, and decided to buy an ESLR controller (TX1...

Those ESC have no BEC

quasi imp Oct 23, 2023, 4:16 AM

#

main juniper Those ESC have no BEC

Ok, what's that mean? 😬😬 Thanks I'm a noob to this

main juniper Oct 23, 2023, 4:17 AM

#

Google BEC you need one anyway

#

BEC = battery eliminator = step down psu

quasi imp Oct 23, 2023, 4:25 AM

#

So would the wiring be something like this? Power going from the battery to the ESCs and to the BEC, and then the ESC and BEC outputs would go to the receiver?

quasi imp Oct 23, 2023, 4:25 AM

#

main juniper Google BEC you need one anyway

Thanks so much for the help btw, it really means a lot

main juniper Oct 23, 2023, 4:32 AM

#

Yup you've got it, thats exactly what you should end up with

quasi imp Oct 23, 2023, 1:52 PM

#

main juniper Yup you've got it, thats exactly what you should end up with

Great, thanks so much. I also found this, would using this and separate batteries also be a workaround?

main juniper Oct 23, 2023, 1:54 PM

#

quasi imp Great, thanks so much. I also found this, would using this and separate batterie...

No idea what that is, you'll want to look up the model number and check what input/output voltage and current it supports

#

Or is the little black box a switch?

quasi imp Oct 23, 2023, 1:55 PM

#

Yeah the box is a little switch

main juniper Oct 23, 2023, 1:57 PM

#

1.5v x2 = 3v so no

quasi imp Oct 23, 2023, 2:06 PM

#

There’s a hidden 2 underneath for a total of 4 batteries so if I used all 4 I could

main juniper Oct 23, 2023, 3:28 PM

#

From the product page https://betafpv.com/products/elrs-micro-receiver
the input voltage is Input voltage: 5V~9V DC @ "+" pad

#

So yes you could in theory, but I'd be concerned about what happens when the batteries start to run out

#

I missed your intended application, for some reason I thought it was a ground based vehicle but I see you say drone. Can you clarify?

fallen prism Oct 23, 2023, 4:38 PM

#

3d printed rc boat

main juniper Oct 23, 2023, 4:40 PM

#

fallen prism 3d printed rc boat

Double blind, I was right the first time. Nearly had a panic attack, I though he was going to try make a quadcopter with just a PWM receiver for a minute.... 🤣

main juniper Oct 23, 2023, 4:42 PM

#

fallen prism 3d printed rc boat

In that you should be fine to use that for testing in a small pond where you can easily retrieve it, but you really need a BEC before you go further

quasi imp Oct 23, 2023, 10:35 PM

#

main juniper In that you should be fine to use that for testing in a small pond where you can...

Ok that’s what I was concerned about

quasi imp Oct 23, 2023, 10:35 PM

#

main juniper Double blind, I was right the first time. Nearly had a panic attack, I though he...

That would be rough😬😬

#

do you think it would be fine using the AA batteries if I checked their power after each use? What would be the concern of using them otherwise?

main juniper Oct 23, 2023, 10:38 PM

#

Hard to say, you'd have to test and find out

#

You loose comms in the middle of the water

#

Voltage doesn't give a good idea of lifespan unless its under load, you could probably get a better idea from telem

#

Best to get a BEC or another stepdown power supply that provides 5V out and can handle the voltage from the LiPo in + at least 5v above this

fallen prism Oct 23, 2023, 11:12 PM

#

I would say don't even mess around with AAA batteries, lipe and a 5V step down

#ELRS PMW Receiver Wiring Issues