There are 4 analog input channels on the Main connector, that share the same external pin with digital channels. The MCU can select one of two external input ranges:

• Range = High (0 – 32 Volts)
• Range = Low (0 – 5 Volts)

Here below the simplified schematic of each analog channel:

Here is an example Arduino sketch that reads analog inputs AIO1 and AIO2 and prints out the measured voltage:

void setup() 

void loop() 

The same example with Zerynth:

from fortebit.polaris import polaris

polaris.init()

while True:
    print("AIO1 (V):", polaris.readAnalogInputVoltage(0, LOW))
    print("AIO2 (V):", polaris.readAnalogInputVoltage(1, HIGH))
    sleep(1000)