ELRS firmware with PWM output | ExpressLRS Community | Page 1

warped gale Oct 15, 2023, 5:53 PM

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Hi, I'm looking to make a firmware build I can use without a flight controller for controlling fixed wings and other RC devices.

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Currently I have a 915MHz TTGO as a receiver and a esp32wroom + AIthinker-01 lora module as a transmitter, which will be added as a backpack to my radiomaster boxer.

sonic anvil Oct 15, 2023, 5:58 PM

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Use any of the PWM targets appropriate for your board. Eg: https://github.com/ExpressLRS/targets/blob/master/RX/Generic 900 PWMP.json

GitHub

targets/RX/Generic 900 PWMP.json at master · ExpressLRS/targets

ExpressLRS target hardware layout files. Contribute to ExpressLRS/targets development by creating an account on GitHub.

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Why not use existing designs or off the shelf hardware though?

warped gale Oct 15, 2023, 6:00 PM

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I do have one of those PWM radiomaster RXs, I can't easily get more electronics where I live and would like to use my stock to build more RCs

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sonic anvil Oct 15, 2023, 6:03 PM

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That is 2.4Ghz, isn't it?

warped gale Oct 15, 2023, 6:04 PM

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Yuea, it'll probably work right away with my boxer but I'm saving it for a fixed wing

warped gale Oct 15, 2023, 8:43 PM

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Soldered accordingly to generic PWM, the ttgo I had was 915, these are 433 apparently

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theres a build for esp8285 for the sx127x but only the "truediversity" for esp32

warped gale Oct 15, 2023, 9:52 PM

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I played around with the PWM receiver and it works well for servos, the only problem I have is that on the tank I'm trying to control it has 4 PWM channels for the 2 motors that control forwards/backwards for the 2 treads. I'd need some code that would take the directional channel input and remix it into the PWMs to drive it properly. is there anywhere in the code I should be looking for that?

sonic anvil Oct 15, 2023, 9:53 PM

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warped gale I played around with the PWM receiver and it works well for servos, the only pro...

You should do this on your radio

warped gale Oct 15, 2023, 9:54 PM

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by setting up a "model" for the tank specifically? I guess that'll be outside the scope of ELRS

sonic anvil Oct 15, 2023, 10:03 PM

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Yes

warped gale Oct 15, 2023, 10:04 PM

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alright well thats a problem for later, I got the diversity firmware on the Rx i have soldered but the wifi isn't turning on. is there a baud to use to see the bootloader to troubleshoot?

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-DAUTO_WIFI_ON_INTERVAL="60"

I might have made some problems with the wiring, the original build is for a esp8285 but theres isn't any options for esp32 with the sx1278

warped gale Oct 15, 2023, 11:39 PM

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alright so I got platformio all updated and I'm going through the files,I can't seem to find where it pulls the boardinfo from for the DIY_900_RX_PWMP_via_UART environment

warped gale Oct 16, 2023, 12:03 AM

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removing ESP32 from build_src_filter and adding -D PLATFORM_ESP32=1 to build_flags didn't change anything, any help?

#ELRS firmware with PWM output