User Manual

3/6/2018 Light Follower Module - Wiki

http://wiki.sunfounder.cc/index.php?title=Light_Follower_Module 1/4

Introduction

Phototransistor, or photo triode, is a photoelectric conversion component that senses the light intensity. The stronger light, the

larger currents, and better conductivity of the triode.

Based on this principle, we use it for light following. It works by converting the conductivity to voltage output, which means the

stronger light shone on it, the smaller voltage output. Then convert the voltage into digital values by the A/D converter on the

MCU. And we can tell the light intensity then by this value.

The module can be used to sense the ambient luminance. The blue potentiometer is to adjust the sensitivity – you can change it

to adapt to specific circumstances. There are two mounting holes of 3mm diameter on the module for easy installation on your

robot.

All in all, this Light Follower Module is a perfect choice for you to achieve a light following project!

Features

1.A three-way light following module uses the MCU STM8S003 as the controller and three 3du5c phototransistors for sensors

2.Sensitivity of the transistor adjustable by the blue potentiometer

3.Equipped with corresponding indicating lights (8 LEDs) – the strong light, the more brightened LEDs

4.Comes with anti-reverse plug and 5-pin anti-reverse cable, for easy and stable wiring

5.Working voltage: 5V; PCB size: 124 x 30 mm

Module Test

PAGE 1
3/6/2018 Light Follower Module - Wiki Introduction Phototransistor, or photo triode, is a photoelectric conversion component that senses the light intensity. The stronger light, the larger currents, and better conductivity of the triode. Based on this principle, we use it for light following. It works by converting the conductivity to voltage output, which means the stronger light shone on it, the smaller voltage output. Then convert the voltage into digital values by the A/D converter on the MCU.
PAGE 2
3/6/2018 Light Follower Module - Wiki Step 1. Install the Arduino IDE in your computer. For detailed steps, refer tohttp://wiki.sunfounder.cc/index.php? title=Install_Arduino_Software Step 2. Connect the Arduino Uno board. Wiring: Light Follower Module ------ Arduino Uno 5V ----------------------- VCC GND ----------------------- GND AD0 ----------------------- A0 AD1 ----------------------- A1 AD2 ----------------------- A2 Step 3. Upload the sketch.
PAGE 3
/6/2018 Light Follower Module - Wiki At the same time you can observe the three columns of indicator LEDs on the module, each column for one photo-sensor. When any of the sensors approaches the light source, the corresponding column of LEDs will brighten; the stronger light, the more LEDs on. When the sensor gets away from the source, the LEDs will dim out.
PAGE 4
3/6/2018 Light Follower Module - Wiki Light_Follower_Module schematic STM8S003_datasheet http://wiki.sunfounder.cc/index.