Serial console
Serial output from the firmware.
Schematic
Wire up the hardware accordingly
Measure the battery voltage for Arduino Zero with SAMD21G microcontroller.
VBAT is connected to the battery or voltage source you wish to measure the voltage of.
#define VBATPIN 6
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
SerialUSB.begin(9600);
while (!SerialUSB) {}
delay(1000);
SerialUSB.println("Start battery voltage measurement!");
}
void loop() {
// SerialUSB.println("HIGH");
digitalWrite(LED_BUILTIN, HIGH);
delay(200);
// SerialUSB.println("LOW");
digitalWrite(LED_BUILTIN, LOW);
delay(200);
float measuredvbat = analogRead(VBATPIN);
for (int i = 0; i < 10; i++) {
measuredvbat += analogRead(VBATPIN);
delay(10);
}
measuredvbat /= 10;
measuredvbat *= 2;
measuredvbat *= 4.5; // Or the reference voltage E.g. 2.8V, 3.3V
measuredvbat /= 1024;
SerialUSB.print("VBat: ");
SerialUSB.print(measuredvbat);
SerialUSB.println("V");
}BOARD?=arduino:samd:arduino_zero_native
PORT := $(shell ls /dev/cu.usbmodem*)
.PHONY: default lint all flash clean
default: lint all flash clean
lint:
cpplint --extensions=ino --filter=-legal/copyright,-whitespace/line_length,-readability/casting,-readability/todo *.ino
all:
# This custom PCB does not have a crytal on pins PA00 and PA01
# Hence, use -DCRYSTALLESS to replace the extra_flags in boards.txt
arduino-cli compile --fqbn $(BOARD) --build-properties build.extra_flags="-DCRYSTALLESS -D__SAMD21G18A__ {build.usb_flags}" ./
flash:
arduino-cli upload -p $(PORT) --fqbn $(BOARD)
clean:
rm -r buildSerial output from the firmware.
Wire up the hardware accordingly