ExpressLRS-Hardware VS ExpressLRS

I want to design a 2.4GHz ExpressLRS receiver and will use as reference open-sourced projects like this board.

Here you go: ELRS module.

For those willing to semi DIY it (which most in this hobby are), here's my solution to getting X-Lite to accept HappyModel ES24TX-Lite. I 3d printed this case (https://github.com/ExpressLRS/ExpressLRS-Hardware/tree/master/PCB/2400MHz/TX_SX1280_Slimmer) You'll need to do a little modification after this is printed. You'll need to cut/break off the 2 post of the screws near the top of the module, this helps the module sit lower in the case. You'll also need to break off the back where the module pins will be. (attached image on google drive of what needs to be removed)https://drive.google.com/file/d/1P-rI2zjyh-zfX8_nWS-tvJQJicM86ICw/view?usp=sharing

Just put the firmware builds under https://github.com/ExpressLRS/ExpressLRS/releases

I didn't really find any reference material for setup, you can see it mentioned at #2060 here.

For receiver Zlyden3D said flashing 2.0 then 3 through Betaflight passthrough worked for them.

I think the controller is only going to have PPM output at best. There's a feature request for ppm input marked "not going to happen", so I think you are out of luck. https://github.com/ExpressLRS/ExpressLRS/issues/421

All you need to do is start sending Channels packets out a UART at 115200 baud and the TX will fire up and start sending them at whatever packet rate it is already configured for. You'll need to disable UART inversion on the TX though because external modules are half-duplex inverted (stupid legacy stuff!) The protocol I've documented here: https://github.com/ExpressLRS/ExpressLRS/wiki/CRSF-Protocol