hi everyone.. i have using PWM driver for a fan circuit (SgtWookie attachment) for my electronic project . how can i add lm35 temperature sensor into the circuit.. help me please.. give me solution. thank you.
That's how I'd do it also. You may want to use an op-amp to amplify the voltage slope, eg. use a gain of 20 to give 200mV/°C. You could also use another op-amp to provide an offset, for instance to give 0v at 20°C.The output of LM35 varies linearly in direct proportion to the temperature at 10mV/'C. So, you need to decide how you're going to reduce/increase duty cycle by reading the temperature-correspondent voltage.
by Duane Benson
by Duane Benson