Two-Way People Counter Kit – Expansion Pack (IR Sensors, TM1637)
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Prices updated: 13 Oct 2026
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About this product
An expansion pack for a door people counter. Two IR obstacle avoidance sensors placed side by side detect which way someone crosses, so the Arduino can tell whether a person entered or left. The number of people inside is shown on a TM1637 4-digit LED display. An Arduino Uno is required and is not included. Suited to learning state machines and event timing.
Specifications
- Sensors
- 2 × IR obstacle avoidance module (LM393)
- Detection range
- 2–30 cm
- Display
- TM1637 4-digit LED display with clock
- Controller
- Arduino Uno (not included)
- Breadboard
- 400 tie points
- Recommended age
- 12–14 years
- Level
- Medium
- Soldering
- Not required
Frequently asked questions
What else do I need besides this expansion pack?
An Arduino Uno and a USB A-to-B cable, since the expansion pack includes neither. The full kit version includes both.
How are the sensors and display connected?
Connect each IR sensor's digital output to a digital input pin on the Arduino, and connect the TM1637's CLK and DIO pins to two more digital pins. Check the exact pins in the sketch you upload.
