PWM Cooling-FAN Control and Over Temperature Protection using LM35 and ATTiny13
Proper thermal dissipation is an essential rule for nowadays electronics. The best operating temperature for the electronic components is 25 degrees (standard room temperature). Thermal dissipation in some commercial devices is not done properly which affects the lifetime and performance of the devices. So, embedding a compact automatic cooling Fan controller board would be useful. Also, it can be used to protect your own designed circuits and their power components, such as regulators, Mosfets, power transistors … etc.
Previously, I had introduced a circuit to control the cooling fans, however, my intention was not to use any microcontroller and keep it as simple as possible. So, the device was a simple ON/OFF switch for the FAN, depending on the defined temperature threshold. This time, I decided to design a complete and more professional circuit to control the majority of the standard FANs (25KHz PWM) using an LM35 temperature sensor and an ATTiny13 microcontroller.
Specifications
Supply Voltage: 12VDC (See text)
Load Over-temperature Protection: Yes (above 60 degrees)
PWM Frequency: 25KHz
FAN Voltage: 12VDC
Maximum Load Voltage/Current: 250V-10A (AC/DC)
Active Temperature Thresholds: 25C to 60C
Over-temperature Warning: Yes (Flashing LED and Buzzer)
More information here:
PWM Cooling-FAN Control and Over Temperature Protection using LM35 and ATTiny13
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