Search found 4 matches

by iae2101
Sun Jul 08, 2007 9:33 pm
Forum: General Discussion
Topic: Wheatstone bridge voltage drop: ME who doesnt know enough EE
Replies: 13
Views: 3071

my temp range is approx -20C to 50C. i found this which i think will work perfectly, http://www.analog.com/en/prod/0,,TMP36,00.html . no WSB, and i dont think it should cause any grounding inssues. But does anyone happen to know of any simular devices to this that measure (ambient) light intensity o...
by iae2101
Sun Jul 08, 2007 9:26 am
Forum: General Discussion
Topic: Wheatstone bridge voltage drop: ME who doesnt know enough EE
Replies: 13
Views: 3071

I just checked out National Semi and saw they had some useful temperature devices. The only problem with it is in order to use them we would need several components that i think we could do without. The chip we are using has 4 single point ADC inputs and a few digital I/O. I was trying to avoid usin...
by iae2101
Mon Jul 02, 2007 9:59 pm
Forum: General Discussion
Topic: Wheatstone bridge voltage drop: ME who doesnt know enough EE
Replies: 13
Views: 3071

my goal is to measure the temperature using an ADC. im building the temperature circuit that must use the LEAST amount of power and has the lowest cost possible. It will be powered off of batteries between 3V to 4.5 Volts. I have talked to friends who suggested using op amps, but considering they ha...
by iae2101
Sun Jul 01, 2007 6:56 pm
Forum: General Discussion
Topic: Wheatstone bridge voltage drop: ME who doesnt know enough EE
Replies: 13
Views: 3071

Wheatstone bridge voltage drop: ME who doesnt know enough EE

I'm trying to figure out the resistance of a thermistor using a wheatstone bridge by measuring the Vout and entering that into a program i created that tells me the resistance. im using three 220ohm resistors and one [email protected] thermistor. I set my voltage supply to 3.3V but as soon as i connect the ...