From 1c0e0618e5e5c6e2856f37deadbcabc1555461fc Mon Sep 17 00:00:00 2001 From: Dominic Clifton Date: Mon, 7 Apr 2014 21:57:46 +0100 Subject: [PATCH] Update HoTT physical connection details (only one diode needed). --- src/telemetry_hott.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/src/telemetry_hott.c b/src/telemetry_hott.c index 60680bd1f4..664941e0cd 100644 --- a/src/telemetry_hott.c +++ b/src/telemetry_hott.c @@ -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.