Before Arduino back in 2004, mate of mine was building a 4 cylinder engine for his scale loco and I built him a water temperature gauge with over-temp alarm.
Unit has an isolated analog voltmeter as the readout and all worked out fine. From memory I made the meter up from a VU meter but can't remember exactly.
Anyhow, plan changed and now there is a 3 cylinder engine as an alternative and almost ready to run ( yes, 14 years) but it seems my mate has gone and lost the meter. (*&^%$#@!)
I modded a miniature 3 wire digital Ebay cheapie to read 10.0v with 1.0v input and blacked out the decimal point BUT then realised these are 3 wire and common ground so no good. (10.0=1v=100degrees_C)
Cannot use the 2 wire version as they need at least 4.5v to start.
Any way of getting around this other than re-making a VU meter as before?
Unit has an isolated analog voltmeter as the readout and all worked out fine. From memory I made the meter up from a VU meter but can't remember exactly.
Anyhow, plan changed and now there is a 3 cylinder engine as an alternative and almost ready to run ( yes, 14 years) but it seems my mate has gone and lost the meter. (*&^%$#@!)
I modded a miniature 3 wire digital Ebay cheapie to read 10.0v with 1.0v input and blacked out the decimal point BUT then realised these are 3 wire and common ground so no good. (10.0=1v=100degrees_C)
Cannot use the 2 wire version as they need at least 4.5v to start.
Any way of getting around this other than re-making a VU meter as before?