GPIO testing
You may also want to test the other GPIOs of your DIY Moteino. Here are some simple analog pin tests. We can use a potentiometer as input to A6 and A7, and the onboard LED (on digital pin 9) to be PWM-ed as output depending on the pot position. Here is the test sketch for testing A6 input:
const int analogInPin = A6; // Analog input pin that the potentiometer is attached to const int analogOutPin = 9; // Analog output pin that the LED is attached to int sensorValue = 0; // value read from the pot int outputValue = 0; // value output to the PWM (analog out) void setup() { // initialize serial communications at 9600 bps: Serial.begin(9600); pinMode(0, OUTPUT); pinMode(A4, OUTPUT); digitalWrite(0, HIGH); digitalWrite(A4, LOW); } void loop() { // read the analog in value: sensorValue = analogRead(analogInPin); // map it to the range of the analog out: outputValue = map(sensorValue, 0, 1023, 0, 255); // change the analog out value: analogWrite(analogOutPin, outputValue); // print the results to the Serial Monitor: Serial.print("sensor = "); Serial.print(sensorValue); Serial.print("\t output = "); Serial.println(outputValue); // wait 2 milliseconds before the next loop for the analog-to-digital // converter to settle after the last reading: delay(2); }
And here’s a test sketch for testing A7 input:
const int analogInPin = A7; // Analog input pin that the potentiometer is attached to const int analogOutPin = 9; // Analog output pin that the LED is attached to int sensorValue = 0; // value read from the pot int outputValue = 0; // value output to the PWM (analog out) void setup() { // initialize serial communications at 9600 bps: Serial.begin(9600); pinMode(1, OUTPUT); pinMode(A5, OUTPUT); digitalWrite(1, HIGH); digitalWrite(A5, LOW); } void loop() { // read the analog in value: sensorValue = analogRead(analogInPin); // map it to the range of the analog out: outputValue = map(sensorValue, 0, 1023, 0, 255); // change the analog out value: analogWrite(analogOutPin, outputValue); // print the results to the Serial Monitor: Serial.print("sensor = "); Serial.print(sensorValue); Serial.print("\t output = "); Serial.println(outputValue); // wait 2 milliseconds before the next loop for the analog-to-digital // converter to settle after the last reading: delay(2); }
For both sketches you will need a potentiometer (any will work) as seen in pictures above. Here’s the LED output at low duty cycle:
Here is the same sketch with the pot turned all the way, the LED is now very bright:
And finally here’s a sketch for checking all other GPIO. This sketch outputs a ~100Hz square wave signal on every output except A6,A7:
void setup() { for(byte i=0;i<19;i++) { pinMode(i, OUTPUT); } } void loop() { for(byte i=0;i<19;i++) { digitalWrite(i, !digitalRead(i)); } delay(5); }
Congratulations, you have assembled and tested your own DIY Moteino, you are on the way to becoming an SMD soldering master!