Data Sheet

67
Lesson 28 Frequency Meter
Overview
In this lesson, you will learn to build a simple frequency meter with UNO R3 or MEGA 2560.
The frequency of square wave is generated by 555 timer, and then it will be sent to the Arduino
GPIO pin, the result to serial monitor through USB port.
Components Required
Name Qty Name Qty
UNO R3 or MEGA 2560 1 10KΩ Potentiometer 1
NE555 Timer 1 104 Capacitor 2
10KΩ Resistor 1 Breadboard 1
DuPont Wire 13
Component Introduction
The NE555 Timer is an integrated circuit (chip) used in a variety of
applications like timer, pulse generation, and oscillator.
Connection Schematic
AREF
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
GND
SDA
SCL/RESET
3V3
5V
A0
A1
A2
A3
A4
A5
GND1
GND2
VIN
Analog Input
Digi tal Input/Output
ARDUINO-NOHOLE
GND
TRIG
OUT
RESET CONT
THRES
DISCH
VCC
1 2 3
10K104
104
UNO R3/
Mega 2560
Potenti
ometer
NE555