With this project you will build a square wave generator and test it on Arduino UNO(or other boards)

For this project you will need:

-An Arduino board(I used UNO R3)

-Schmitt Trigger 74HC14(also called hex inverter)

-3 Wires

-100k Ohm resistor

-100nF capacitor



-Connect the 5V pin of the Arduino to Vcc on the 74HC14.

-Connect GND of Arduino to negative row of breadboard and to GND of 74HC14.

-Connect capacitor between GND of breadboard and pin 1 on 74HC14.

-Connect resistor between pin 1 and 2 of 74HC14.

-Finally connect a wire to pin 2 of 74HC14 and Analog pin A0 on Arduino.

Now you need to upload the following code to Arduino and run the Serial Monitor:

void setup() {

void loop() {
int sensorValue = analogRead(A0);
// print out the value you read:

Don't forget to change the baud rate in the serial monitor to 250000 baud!!!