I asked a question on here a few weeks ago, and received a tremendous amount of help. In the interest of saving everyone's time, I'll ask if it's feasible before asking how.
My engine coolant temperature is monitored by a thermocouple, with resistances varying from around 300,000 ohms @ -40*F to around 400 ohms @ 250*F. This thermocouple has +5.1V on one side, and the other side goes to the engine control computer. I'm assuming the engine computer has another set resistance so it can tell how much the temperature varies, and thereby know the engine coolant temperature.
I'd like to know how plausible it would be to make a circuit that compares the voltage from this circuit with a preset value to activate the coil of a simple mechanical relay, which will turn on an electric fan. I'd simply like to turn on the fan @ 210*F, and run it for some predetermined amount of time.
How complicated is this, could anyone on here help me with it, and is it practical if there is an over-the-counter $60 option?
Thanks for any help/opinions!
My engine coolant temperature is monitored by a thermocouple, with resistances varying from around 300,000 ohms @ -40*F to around 400 ohms @ 250*F. This thermocouple has +5.1V on one side, and the other side goes to the engine control computer. I'm assuming the engine computer has another set resistance so it can tell how much the temperature varies, and thereby know the engine coolant temperature.
I'd like to know how plausible it would be to make a circuit that compares the voltage from this circuit with a preset value to activate the coil of a simple mechanical relay, which will turn on an electric fan. I'd simply like to turn on the fan @ 210*F, and run it for some predetermined amount of time.
How complicated is this, could anyone on here help me with it, and is it practical if there is an over-the-counter $60 option?
Thanks for any help/opinions!