Bidirectional Visitor Counter using CircuitPython on Maker Nano RP2040

Introduction

In this video I would like to share about a bidirectional visitor counter project that is programmed using CircuitPython on Maker Nano RP2040.

Video

Hardware Preparation

This is the list of items used in the video.

• Maker Nano RP2040
• IO Expansion for Nano
• Adjustable Infrared Sensor Switch
• I2C 1602 Serial LCD
• 12mm Momentary Push Button
• USB Micro B Cable
• 3D printing products

3D Printed Parts

You can download the STL file for casing here:

• Thingiverse - https://www.thingiverse.com/thing:5350543

Sample Program

This is CircuitPython sample program. You need to include this library in your CIRCUITPY/lib folder. You can download it from CircuitPython Library Bundle.

• simpleio.py

For lcd.py and i2c_pcf8574_interface.py, please save it in your CIRCUITPY/lib/lcd folder. Yes, you need to create the lcd folder in the lib folder.

Thank You

References:

• Rotary Encoder in CircuitPython
• CircuitPython library for I2C LCD by dhalbert

Thanks for reading this tutorial. If you have any technical inquiries, please post at Cytron Technical Forum.

"Please be reminded, this tutorial is prepared for you to try and learn.
You are encouraged to improve the code for a better application."