| Condition: | New |
|---|---|
| Customized: | Customized |
| Certification: | ISO9001 |
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Photoresistor and Application Demonstration Board Educational and DIY Projects
1, Purpose:
According to the requirements of the high school physics teaching equipment standards, this study explores the variation of thermistor size with temperature and the practical application of using the characteristics of thermistors for simple automation control devices.
2, The working principle and circuit schematic diagram of the instrument are as follows:
When the power is turned on, the resistance of the thermistor with negative temperature coefficient at room temperature is high, the output of the NOT gate circuit is low, the relay is in normally open conduction, and the motor works normally. If the temperature of the motor increases, the resistance of the thermistor with negative temperature coefficient is small, the output of the NOT gate circuit is high, the relay is in normally closed conduction, the motor is protected by heat and stops working, and the warning LED indicator red light is on.
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