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# temperature control circuit

Question asked by temperaturehelp in #Electronics on Feb 25, 2009
temperaturehelp · Feb 25, 2009
Rank E2 - BEGINNER
I have project in which i have to create a soultion which will mantain the temperature of a living space with a volume of 400m3 between 25-30 degrees centigrade.

I can use the following components

lm35 TEMPERATURE SENSOR
lm358 Operational amplifer
3 X lm311 compararators
74ls04 Hew NOT Gate
2 X 12 Volt Relays

If anybody could design us a circuit diagram this would be great!!! many thanks my friends Posted in: #Electronics
gohm · Feb 25, 2009
Rank A3 - PRO
Have you attempted to diagram yourselves yet? Any electrical students on your team?
ashuashi · Feb 25, 2009
Rank C3 - EXPERT
temperaturehelp
I have project in which i have to create a soultion which will mantain the temperature of a living space with a volume of 400m3 between 25-30 degrees centigrade.

I can use the following components

lm35 TEMPERATURE SENSOR
lm358 Operational amplifer
3 X lm311 compararators
74ls04 Hew NOT Gate
2 X 12 Volt Relays

If anybody could design us a circuit diagram this would be great!!! many thanks my friends
Hey Dear,

Control of temperature will depend on various parameters.

1. What is the ambient temperature. Its variations in summers & winters or the whole year.

2. Do you need to cool the space or heat the space.

3. What will you use to cool/heat the space.

4. Are you aware of PID controls.

Sorry to bombard you with questions. But these are important points required to control the temperature
raithrovers1 · Mar 9, 2009
Rank E1 - BEGINNER
I would probably start by saying you have two 12 volt relays. I would guess that these will control your output circuit.
If the temperature goes above 30 degrees then you will have to figure out how to send a 12 volt signal to the relay which will then turn on the cold air.
Also if the temperature goes below 25 degrees you send a 12V signal to the other relay which will switch on the heating.
All the other components are used to convert the small signal that the temperature sensor gives out to a 12v signal that switches on and off when required.