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Merge pull request #6176 from Scavanger/Add-single-wire-in-HoTT-Doc

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Added a hint of the HoTT single wire connection in Documentaion
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Michael Keller 2018-06-20 20:41:06 +12:00 • committed by GitHub
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8
docs/Telemetry.md
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@ -107,6 +107,9 @@ Use the latest Graupner firmware for your transmitter and receiver.
Older HoTT transmitters required the EAM and GPS modules to be enabled in the telemetry menu of the transmitter. (e.g. on MX-20)
You can connect HoTT-Telemetry in two ways:
#### Old way:
Serial ports use two wires but HoTT uses a single wire so some electronics are required so that the signals don't get mixed up. The TX and RX pins of
a serial port should be connected using a diode and a single wire to the `T` port on a HoTT receiver.
@ -123,6 +126,11 @@ The diode should be arranged to allow the data signals to flow the right way
1N4148 diodes have been tested and work with the GR-24.
When using the diode disable `tlm_halfduplex`, go to CLI and type `set tlm_halfduplex = OFF`, don't forget a `save` afterwards.
#### New way:
You can use a single connection, connect HoTT RX/TX only to serial TX, leave serial RX open and make sure `tlm_halfduplex` is ON.
As noticed by Skrebber the GR-12 (and probably GR-16/24, too) are based on a PIC 24FJ64GA-002, which has 5V tolerant digital pins.
Note: The SoftSerial ports may not be 5V tolerant on your board. Verify if you require a 5v/3.3v level shifters.