# Infrared Obstacle Avoidance Sensor with micro:bit

Let's take a closer look at the infrared obstacle avoidance sensor. It has three pins:

OUT: This is the signal output pin which will be connected to a GPIO pin on the micro:bit. The output signal will be '0' when there is an obstacle in its way, else it will be '1'.

GND: In electronics, we define a point in a circuit to be a kind of zero volts or 0V reference point, on which to base all other voltage measurements. This point is called  ground or GND.

3.3V  : While 'VCC' stands for Voltage Common Collector. We'll connect the VCC pin to 3.3V on the micro:bit


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wiki.linhkientot.vn/micro-bit-products/micro-bit-starter-kit-v1/infrared-obstacle-avoidance-sensor-with-micro-bit.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.