18. Octopus Analog Photocell Brick OBPhotocell

18.1. Introduction

Photocells are sensors that allow you to detect light. They are small, inexpensive, low-power, easy to use and don’t wear out. For that reason they often appear in toys, gadgets and appliances.


18.2. Characteristics

  • Photocells are basically a resistor that changes its resistive value (in ohms Ω)

  • They have a low cost which is also friendly to the environment.

  • Each photocell sensor will act a little differently than the other, even if they are from the same batch.

  • For this reason, they shouldn’t be used to try to determine precise light levels in lux or millicandela. Instead, you can expect to only be able to determine basic light changes.

  • The 3-pins ports is easy to plug and play.

18.3. Specifications

Item | Parameter :-: | :-: SKU|EF04032 Power Supply|3V-5.5V Connector Type|Analog Pins Definition|1-Signal 2-VCC 3-GND Response|Quick response with high sensitivity Circuit|Simple Stability|Stable and durable

18.4. Outlook and Dimensions


18.5. Quick to Start

Materials used and connection diagram

  • Connect to the P1 port as the picture shows

    Take sensor:bit for example


Program as the picture shows



Links: https://makecode.microbit.org/_XsgKbLhb54MP](https://makecode.microbit.org/_XsgKbLhb54MP)

You can also download the links below:



  • While the light intensity is over 700, an icon is showing on the micro:bit; or a rectangle is showing on the micro:bit.

18.6. Relevant Cases

18.7. Technique Files