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How to use more digital pins on Arduino Uno
I need more digital input/output pins on Arduino Uno. How to increase digital pins on Arduino Uno?
Answer
There are several way to add more digital input/output pin on Arduino Uno:
- Use analog pins as digital pin: pins A0 to A5 can be used as dogital input/output pin. For example:
void setup() {
pinMode(A5, OUTPUT); // sets the digital pin A5 as output
}
void loop() {
digitalWrite(A5, HIGH); // sets the digital pin A5 on
delay(1000); // waits for a second
digitalWrite(A5, LOW); // sets the digital pin A5 off
delay(1000); // waits for a second
}
- Use an IO Expander module: for example PCF8574
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