SimpleTX support ELRS 3.0 in the way that gimbal data can be transfer to the TX moduel, because the communication between TX and the transmitter dosen't change since ELRS 1.0 (CRSF protocol). But the simpleTX do not support power or fresh rate config for 3.0 yet (plan to do that).

[tmb-ix]

          SimpleTX support ELRS 3.0 in the way that gimbal data can be transfer to the TX moduel, because the communication between TX and the transmitter dosen't change since ELRS 1.0 (CRSF protocol). But the simpleTX do not support power or fresh rate config for 3.0 yet (plan to do that). 

For the Happymodel moduel, do you follow every step in my readme file, I can not test because I use DIY module (JR, nano and super slim) all of them works fine, most importand thing is uncheck - uart invert, because simpleTX only support un inverted uart on avr micro controller I use.

Originally posted by @kkbin505 in https://github.com/kkbin505/Arduino-Transmitter-for-ELRS/issues/8#issuecomment-1259518158