If you're interested in building your frequency reader using an Arduino and a PC817 optocoupler, you've come to the right place! In this guide, we'll walk you through the process step-by-step, so you can easily follow along even if you're a beginner.
A PC817 optocoupler is an electronic component that helps isolate the input signal from the output signal. This means it protects the circuit, preventing electrical noise or interference from affecting the input signal. It's a critical component in this project because it helps to ensure accurate frequency measurement.
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| Frequency reader using Arduino. |
Components:
- Arduino UNO
- Resistor
- Capacitor
- PC817 optocoupler
- Virtual terminal
- LCD 1602
- I2C interface
Steps
- Open Proteus 8 software and add ARDUINO UNO R3, CAPACITOR, DIODE, LM016L, PC817, PCF8574, RESISTOR, and VSINE components to the workspace.
Add components to the workspace - Wiring all the components according to the figure below.
Wiring the circuit - Copy the Hex file, then paste it to the project file Arduino board.
Copy and paste the code - Set the AC voltage source to a frequency of 50 Hz and an amplitude of 220-240V and start the simulation.
Set the AC voltage and frequency at VSINE 
Simulation result 1
The results indicate that the frequency instability is caused by noise at the input side of the PC817. We can neglect this issue because only the error percentage is not small. - Let's try setting the AC voltage source to a frequency of 60 Hz and an amplitude of 120V, as these are the typical settings used in North America for household electrical systems.
Set the AC voltage and frequency at VSINE 
Simulation result 2
It's working great, as it can easily detect the 60 Hz frequency.
Video:
We'd love to hear your thoughts on this project! If you have any suggestions or questions, feel free to leave them in the comments section below. We appreciate your time and feedback! Happy building! 👷
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