Thread: OLED/PICAXE Gauge Project - Finished

How did you do the oil temp gauge? I would love to do that for my coolant temp and water temp.

Originally Posted by MAZDABOY

How did you do the oil temp gauge? I would love to do that for my coolant temp and water temp.

Like how do I measure it? Thermocouple and AD595 opamp.

How did you wire it all up and everything? Link to the stuff you bought? How do you program it etc? Can you use a different thermostat?

Originally Posted by MAZDABOY

How did you wire it all up and everything? Link to the stuff you bought? How do you program it etc? Can you use a different thermostat?

Well, it takes alittle more than just buying some stuff and connecting the wires together.

In a nutshell, the brain is the PICAXE 18x, you can use any microcontroller you are comfortable with. OLED display comes from http://www.4dsystems.com.au/products.php Thermocouple is a type k. I used a thermocouple because it was the easiest way to read temp without drilling holes dealing with fittings etc. If you can figure out the output of a thermostat, sensor you might be able to use that (depends upon output, your microcontroller etc).

The OLED is sensitive to the startup sequence of a car so you have delay power on and further, when you turn off the car, you have to send a signal to the OLED display to turn itself off (if you don't, you could risk damaging it over time). So I built a timed power circuit and the PICAXE is interrupt driven to sense the car turning off and then sending the shut down signal to the display.

How much did everything cost you? Can you do a write up? Got any more pics?
I have a t-fitting that I can use for my oil temp which is no big deal. I can do wiring no problem but circuit boards and such is newish to me.

Also does the circuit board use a 12v input or 5v? What board did you use?

Any other info? I want to build one.