ok = open_serial(1, 2, 115200);      // port 2, baud rate 115200
if ok ~= 0 then error('Unable to open serial port, please check'); end
for i = 1:1000                     // Run for 1000 iterations
    val = cmd_digital_in(1, 12);  // Read the status of pin 12
    cmd_arduino_meter(val);
end
close_serial(1);                   // To close the connection safely