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Update HoTT connection details

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Dominic Clifton 2015-01-17 19:51:11 +00:00
parent 7876530b0f
commit 01fb028fe4
1 changed files with 6 additions and 5 deletions
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docs/Telemetry.md
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@ -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.