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Using Receiver as transmitter
As all openLRS receivers are capable of transmission they can be used as 100mW transmitters.
9ch modules (Hawkeye/Flytron/OrangeRX)
output1(rssi) - passive buzzer (~speaker, multi freq support)
output2(ch1) - unused
output3(ch2) - active buzzer (single freq)
output4(ch3) - bind button (between signal and ground)
output5(ch4) - PPM input
output6(ch5) - RED led (between signal and ground, duplicates onboard LED)
output7(ch6) - GREEN led (between signal and ground, duplicates onboard LED)
output8(ch7) - unused
output9(ch8) - unused
4/6ch modules (DTF-UHF)
output1 - PPM input
output2 - bind button (between signal and ground)
output3 - passive buzzer (~speaker, multi freq support)
output4 - active buzzer (single freq)
output5 - RED led (between signal and ground, duplicates onboard LED)
output6 - GREEN led (between signal and ground, duplicates onboard LED)
As the receivers have fairly small voltage regulator it is not recommended to power them with more than 6V or so. Use a BEC to preregulate voltage to 5/6V before feeding to RX module (via servo connectors)
A normal single contact non locking push button should be used, as pullup is provided internally the button goes between GND and signal pin.
As the outputs have resistors on them it is necessary to have a transistor driver to be able to drive buzzer/speaker.
LED outputs are duplicated on IO pins to allow easily mount LEDs in visible location. There is 1kOhm resistors thus very limited current is provided so LEDs should be high efficiency ones (ultrabright).