Reading VBAT on imp002 EVB

read_vbat_imp002-evb.device.nut

vbat_sns <- hardware.pinB;
vbat_sns_en <- hardware.pin2;

vbat_sns.configure(ANALOG_IN);
vbat_sns_en.configure(DIGITAL_OUT, 0);

function getVbat() {
	// enable the monitoring circuit
	vbat_sns_en.write(1);

	// average 10 readings to reduce noise
	local vpin = 0;
	for (local i = 0; i < 10; i++) {
		vpin += vbat_sns.read();
	}
	vpin = (vpin * 1.0) / 10.0;

	// disable the monitoring circuit to save power
	vbat_sns_en.write(0);

	// convert ADC output to voltage
	vpin = (vpin / 65535.0) * hardware.voltage();

	// calculate VBAT from Vpin
	local vbat = vpin * (6.9 / 4.7);
	return vbat;
}


server.log(format("Battery Voltage: %0.2fV", getVbat()));