This makes Taranis show the A2 voltage on the main display screen, instead of the normally shown receiver voltage (A1). Important thing is to choose A2 for “Volt source”. The telemetry config page for my Taranis in Companion9X looks like this: The A2 range (maximum value) needs to be set up correctly - in my case to 18.75V (3.3V max at A2 port divided by the voltage divider factor, which is 4,7/(22+4,7) = 0,176 3,3 / 0,176 = 18,75). The connection diagram looks like this:įinally, minimal settings are needed in the transmitter to process the A2 telemetry value correctly and accept it as the main model voltage, with the corresponding warnings for low and critical voltages. I’ve soldered the voltage divider on a servo cable, so it can be directly connected to the A2 port of my D8R-XP. The resistors R 1 and R 2 are chosen in such a way, that the maximum output voltage will be less or equal to 3.3V (the maximum voltage that can be directly applied to the A1/A2 ports): V in is the positive connection of out battery (+), and V out is the divided voltage. The electrical scheme for such a divider looks like this (source: Wikipedia): Using a simple voltage divider soldered from two resistors, one can monitor the main battery voltage of a model (or any other voltage).
It is measured internally (0-3.3V = 0-100%) and transmitted via the telemetry uplink to your transmitter. On those ports, a voltage of up to 3.3V can be connected. On some receivers both are freely accessible (D8R-XP, D8R-Plus), on others the A1 port is hardwired to the internal receiver voltage, but the A2 port is always accessible for external connections (D4R-II). The FrSky D-series receivers have a great feature: the analogue telemetry inputs, called A1 and A2. No sensors or other electronics are required - only a single servo cable and two resistors, total value of about 50c + some soldering. Here I’d like to share a simple Lipo voltage monitoring setup, that I’m using in my Bixler with an FrSky D8R-XP receiver.
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