fluctuating temperature control?
suppose i build a simple temperature controller which would just work as a simple on/off switch using any temperature sensor attached to a buffer circuit... a relay is connected to the buffer and the relay performs the switching action at a temperature set by a potentiometer in the sensor circuit..
suppose a fan is switched on when temperature reaches 60degree celcius and the place starts cooling down to 59.9 (+/- some percent) d celcius...the sensor sees the change and switches off the fan even at .1 degree change...and when the temp rise by .1d it would switch on again...(just my theory..not sure)
question: how to make the fan be switched on until the temp drops till 55d celcius(or any other value)? (or some time gap like 15mins)?
thanks for bearing my long question but i wanted to clear myself... as i am a little new in electronics and want to start by making such simple things