Reverse engineering and replacing most of the innards of a LEGO dirt crusher
V0.5 Used the HC-12 serial radio module.
V1 Implements a 2 byte per frame radio link with a pair of NRF24L01+ modules.
First payload byte is transmitter readout, second payload byte is the automatic retransmission count, used as a makeshift rssi for the OSD on the analog FPV feed.
V2 Used a pair of SX1276 Lora modules.
V3 Uses a pair of ELRS radio modules
Also: The transmitters have a built in lipo battery that charges with a USB-C cable... And a little OLED to show telemetry that looks like this:
