追光电路 Light following circuit

用一个2822功放芯片，两个光敏电阻，两个一千欧姆的电阻，连接它们，接上小马达和一个太阳能面板，用光源照射，就完成了一个简单的追光电路啦。

电路原理说明

追光电路是一个基于光电效应和信号放大原理的自动控制系统。它的核心工作原理如下：

光电检测：两个光敏电阻（LDR）分别安装在太阳能板的两侧，当光线照射时，光敏电阻的阻值会随光照强度变化。光照越强，电阻值越小。

信号比较：两个光敏电阻与两个1kΩ电阻组成分压电路，当两侧光照不均时，会产生不同的电压信号。

信号放大：2822功放芯片接收来自光敏电阻的微弱电压差信号，并将其放大到足以驱动马达的水平。

马达驱动：放大后的信号驱动小型直流马达转动，马达通过机械结构带动太阳能板旋转。

自动调节：当太阳能板正对光源时，两侧光敏电阻接收的光照相等，电路平衡，马达停止转动；当光源移动导致光照不均时，电路自动调整太阳能板方向，使其重新对准光源。

DIY制作指南

想要亲手制作一个追光电路吗？以下是简单步骤：

所需材料：

• 2822功放芯片 ×1
• 光敏电阻 ×2
• 1kΩ电阻 ×2
• 小型直流马达 ×1
• 小型太阳能板 ×1
• 面包板或电路板 ×1
• 连接导线若干
• 电池或电源（3-6V）

制作步骤：

1. 将两个光敏电阻和两个1kΩ电阻分别配对，组成两个分压电路
2. 将分压电路的输出连接到2822芯片的输入端
3. 将2822芯片的输出端连接到直流马达
4. 将太阳能板连接到电路供电部分
5. 将光敏电阻对称安装在太阳能板两侧
6. 将马达与太阳能板通过简单机械结构连接
7. 接通电源测试电路功能

调试技巧：

• 如果太阳能板转动方向错误，交换两个光敏电阻的连接
• 如果反应过于敏感，可适当增大电阻值
• 确保机械转动部分灵活顺畅

English Version

Circuit Principle Explanation

The light-tracking circuit is an automatic control system based on the photoelectric effect and signal amplification principles. Its core working principle is as follows:

Photoelectric Detection: Two photoresistors (LDRs) are installed on both sides of the solar panel. When light shines on them, the resistance of the photoresistors changes with light intensity. The stronger the light, the lower the resistance.

Signal Comparison: The two photoresistors and two 1kΩ resistors form voltage divider circuits. When light intensity is uneven on both sides, they generate different voltage signals.

Signal Amplification: The 2822 amplifier chip receives the weak voltage difference signals from the photoresistors and amplifies them to a level sufficient to drive the motor.

Motor Drive: The amplified signals drive a small DC motor to rotate, and the motor drives the solar panel to rotate through a mechanical structure.

Automatic Adjustment: When the solar panel faces the light source directly, both photoresistors receive equal light, the circuit is balanced, and the motor stops rotating. When the light source moves causing uneven illumination, the circuit automatically adjusts the direction of the solar panel to realign it with the light source.

DIY Guide

Want to build your own light-tracking circuit? Here are the simple steps:

Required Materials:

• 2822 amplifier chip ×1
• Photoresistors ×2
• 1kΩ resistors ×2
• Small DC motor ×1
• Small solar panel ×1
• Breadboard or circuit board ×1
• Connecting wires
• Battery or power supply (3-6V)

Construction Steps:

1. Pair the two photoresistors with the two 1kΩ resistors to form two voltage divider circuits
2. Connect the outputs of the voltage divider circuits to the input pins of the 2822 chip
3. Connect the output pins of the 2822 chip to the DC motor
4. Connect the solar panel to the power supply section of the circuit
5. Install the photoresistors symmetrically on both sides of the solar panel
6. Connect the motor to the solar panel through a simple mechanical structure
7. Connect the power supply and test the circuit function

Debugging Tips:

• If the solar panel rotates in the wrong direction, swap the connections of the two photoresistors
• If the response is too sensitive, appropriately increase the resistor values
• Ensure the mechanical rotation part is flexible and smooth