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Code Issues Wiki Activity

Update HoTT physical connection details (only one diode needed).

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This commit is contained in:
Dominic Clifton 2014-04-07 21:57:46 +01:00
parent c73488b9a8
commit 1c0e0618e5
1 changed files with 4 additions and 8 deletions
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12
src/telemetry_hott.c
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@ -23,20 +23,16 @@
* the signals don't get mixed up. When baseflight transmits it should not receive it's own transmission.
*
* Connect as follows:
* HoTT TX/RX -> 1N4148 Diode -(| )- -> Serial RX
* Serial TX -> 1N4148 Diode -(| )- -> 10k Resistor -(||| |) -> HoTT TX/RX
* HoTT TX/RX -> Serial RX (connect directly)
* Serial TX -> 1N4148 Diode -(| )-> HoTT TX/RX (connect via diode)
*
* Diodes should be arranged to allow the data signals to flow the right way
* The diode should be arranged to allow the data signals to flow the right way
* -(| )- == Diode, | indicates cathode marker.
* 10k Resistor is Brown Black Orange, Gold (5%)
*
* Note the above connections are not 100% reliable, the signal at the HoTT port is not clean, perhaps a
* transistor on the serial RX line is needed?
*
* As noticed by Skrebber the GR-12 (and probably GR-16/24, too) are based on a PIC 24FJ64GA-002, which digitals pins are 5V tolerant.
*
* Note: The softserial ports are not listed as 5V tolerant in the STM32F103xx data sheet pinouts and pin description
* section. No 5v/3.3v level shifters are required. The softserial port should not be inverted.
* section. Verify if you require a 5v/3.3v level shifters. The softserial port should not be inverted.
*
* Technically it is possible to use less components and disable softserial RX when transmitting but that is
* not currently supported.