# Arduino Capacitance Meter

We have a cost-effective capacitance meter to measure capacitance using Arduino.

## Project info

Difficulty: Moderate

Platforms: Arduino

Estimated time: 1 hour

## Items used in this project

### Hardware components

 Standard Lcd 16x2 White On Blue x 1 Resistor 10k Ohm 1/4 Watt Pth - 20 Pk x 1 Resistor 1k Ohm 1/4 Watt Pth - 20 Pk x 2 555 Timer Ic Cmos x 1 Arduino Mkrfox 1200 x 1 Servo Trigger Trigger x 1 Sparkfun Capacitor Kit x 1 Sparkfun Capacitor Kit x 1

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### Software apps and online services

 Arduino IDE

## Story

555Timer IC

555 Timer IC Based Square Wave Generator 555 Timer IC Based Square Wave Generator

The output signal frequency relies on R1, R2 resistors, and capacitor C1. The equation is given as,

Frequency (F) = 1/ (Time period) = 1.44/ ((R1+R2*2)*C1).

By placing the resistance and capacitance values in the equation we will see the frequency of output square wave.

Frequency (F) = 1/ (Time period) = 1.44/ (21000*C).

From the above formula, we can find out the capacitance

Capacitance C = 1.44/ (21000*F)

The Uno has a specific function pulseIn, which allows us to ascertain the positive state duration or negative state duration of a precise rectangular wave.

After connecting the unknown capacitor to the 555 timer circuit which generates a square wave output and whose frequency is instantly associated with the capacitance of the capacitor. This signal is provided to UNO through the Schmitt Trigger gate. The UNO estimates the frequency. Using this frequency we program the UNO to estimate the capacitance with the above formula. IoT Course will give a thorough view of such IoT Applications.