From 01fb028fe4d2bf5ba257403a3485ee368318b4e3 Mon Sep 17 00:00:00 2001 From: Dominic Clifton Date: Sat, 17 Jan 2015 19:51:11 +0000 Subject: [PATCH] Update HoTT connection details --- docs/Telemetry.md | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/docs/Telemetry.md b/docs/Telemetry.md index 1358f25a06..27e5010555 100644 --- a/docs/Telemetry.md +++ b/docs/Telemetry.md @@ -64,17 +64,18 @@ Only Electric Air Modules and GPS Modules are emulated, remember to enable them 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. Connect as follows: -``` -HoTT TX/RX -> Serial RX (connect directly) -Serial TX -> 1N4148 Diode -(| )-> HoTT TX/RX (connect via diode) -``` + +* HoTT TX/RX `T` -> Serial RX (connect directly) +* HoTT TX/RX `T` -> Diode `-( |)-` > Serial TX (connect via diode) The diode should be arranged to allow the data signals to flow the right way ``` --(| )- == Diode, | indicates cathode marker. +-( |)- == Diode, | indicates cathode marker. ``` +1N4148 diodes have been tested and work with the GR-24. + 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 are not listed as 5V tolerant in the STM32F103xx data sheet pinouts and pin description section. Verify if you require a 5v/3.3v level shifters.