Wednesday, April 25, 2018

Circuit Schematic of Upto 40KHz Frequency Counter using Arduino UNO

Eltronicschool. - Do you want to build by your self using Arduino UNO and also LCD screen in this time, Frequency counter? If you want do it, maybe you can design it using the circuit schematic look like shown in Figure 1 below.

Using this circuit schematic, frequency counter will count upto 40KHz and displayed in LCD screen 16 x 2. Maybe the circuit schematic of Upto 400KHz frequency counter is very simple and easy to build.

Circuit Schematic

Figure 1. Circuit schematic of upto 40KHz frequency counter using Arduino UNO and LCD screen 16x2 (Source:

Component Part
  1. Arduino UNO
  2. Resistor
  3. LCD screen 16x2
  4. Variable resistor

Circuit schematic like in Figure 1 above is upto 40KHz frequency counter using Arduino UNO. Using this circuit schematic completed with source code, will allow you to enjoy frequency counter displayed in LCD screen 16x2. Using this circuit we can minimize the external component to count the frequency.

How it works

According Circuitstoday site describe the frequency to be counted is connected to digital pin 12 of the arduino. pulseIn() function is used here for counting the frequency connected to pin 12. pulseIn() function counts the number of pulses (HIGH or LOW) coming to a particular pin of the arduino. The general syntax of this function is pulseIn(pin, value, time) where pin is the name of the pin, value is either HIGH or LOW and time is time for which the function to wait for a pulse. The function returns zero if there is no valid pulse with in the specified time. The pulseIn() function can count pulses with time period ranging from 10 μS to 3 minutes. For more about cource code here.

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