the temp gauge mod

[slobodan]

A simple LCD display calibrated as a voltmeter, and then configured with a voltage divider to convert the input voltage to your conventional gauge to a direct reading of temp should work, and should be fairly straightforward to implement - if not to calibrate.

Yeah, that word 'simple' is in the wrong instance, sorry.

[Apache]

Yeah, that word 'simple' is in the wrong instance, sorry.

Haha sorry. I meant a basic one. You can get them from RS and probably Maplin as a bare LCD display that just requires a couple of resistors to configure as a voltmeter with a 0-2V, 0-20V, or 0-200mV display. The 0-200mV range would work fine as it will display 001 to 200, which means if you make a voltage divider suitable to display, say, 090 when the engine temp is 90 degrees, you've cracked it. It would be easier to do than describe.

[GBV8]

Cheers email sent.

Got that.

[dieselboy]

It goes better after the beer, i was thinking of doing this but as i got an aftermarket gauge i thought "sod it"

I think the better setup is to have an additional guage like you have it and leave the factory one at factory spec. That way you know what temp Toyota are determining as "Normal running temp" and what the engine is actually running at. On my guage normal seems to be from 50c to 90c (haven't seen it hotter yet).

[Albannach]

That way you know what temp Toyota are determining as "Normal running temp"

That's the problem though, they don't. They have a massive range that they have deemed to be 'normal'.

[dieselboy]

That's the problem though, they don't. They have a massive range that they have deemed to be 'normal'.

That's fine by me. I have an aux gauge to know when to clench my back door (or not).

[spacast]

Gary, the resistors arrived this morning.
Thanks very much.

[GBV8]

Gary, the resistors arrived this morning.
Thanks very much.

Great stuff!

All where posted together so the others should have theirs soon.

[Bayside]

Haha sorry. I meant a basic one. You can get them from RS and probably Maplin as a bare LCD display that just requires a couple of resistors to configure as a voltmeter with a 0-2V, 0-20V, or 0-200mV display. The 0-200mV range would work fine as it will display 001 to 200, which means if you make a voltage divider suitable to display, say, 090 when the engine temp is 90 degrees, you've cracked it. It would be easier to do than describe.

Cheers Andy

So if I measure the water temperature with a probe or thermometer or something at the same time as measuring the voltage being sent in relation to that temperature sent to the guage to make the needle move then if taken at various tempratures from cold to operating temp that will give me the current per deg C and can calibrate it from there?

[Deadeye Si]

No problem Boss!
I'll stick them in the post for ya.





Certainly, email me your details.

Cheers Gary parts arrived on sat morn thanx.
now i just need sum time to get it sorted.

[Apache]

Cheers Andy

So if I measure the water temperature with a probe or thermometer or something at the same time as measuring the voltage being sent in relation to that temperature sent to the guage to make the needle move then if taken at various tempratures from cold to operating temp that will give me the current per deg C and can calibrate it from there?

More or less yes, but it will be mV/deg C rather than a current measurement.

[Bayside]

Cool Ill see if I can get my brain around a simple circuit to achieve this.