How to Build a Temperature Switch Using Thermistor & Relay in Proteus | Thermal Control Circuit

This video demonstrates a temperature-controlled switch circuit using a thermistor (RT1) and transistor-based relay driver in Proteus Software. The circuit automatically activates a 9V motor when the ambient temperature exceeds a user-defined threshold, ideal for applications like cooling systems or overheating protection.

Key Features:

Thermistor (RT1): Detects temperature changes and adjusts resistance accordingly (resistance decreases as temperature rises).
Transistor Pair (Q1/Q2): Amplifies the thermistor signal to drive the relay coil.
Relay (RL1): Switches the 9V motor on/off based on temperature.
Adjustable Threshold: Use RV1 to set the temperature limit (e.g., 12°C as shown in the simulation).
Flyback Diode (D1): Protects transistors from voltage spikes during relay switching.
How It Works:

Temperature Sensing:
RT1’s resistance drops as temperature increases → Voltage divider (R1 + RT1) sends a higher voltage to Q1’s base.
Transistor Amplification:
Q1 turns on → Activates Q2 → Relay coil energizes → Motor turns ON.
Threshold Adjustment:
RV1 fine-tunes the temperature at which the motor activates (e.g., 12°C in this simulation).
What you’ll learn:

How thermistors work and interface with electronic circuits.
Role of transistors in signal amplification for relay control.
Importance of flyback diodes in inductive load circuits.
Simulating real-world temperature-controlled systems in Proteus.
⚠️ Safety Note: Always use isolation transformers and follow safety protocols when working with motors and relays.

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