Question about digital thermometer circuit board

I have a very inexpensive digital thermometer/hygrometer that works well but the temperature only reads centigrade. The circuit board has some markings (R9 F; R7 C) and I have the feeling it can be done. Can anyone advise me on this? Here is a photo of the board:

formatting link

Thanks!

Reply to
m-m
Loading thread data ...

If you feel lucky, unsolder the resistor and move it over.

Reply to
gfretwell

The display is controlled by which resistor is shorted, thus the 0 ohm resi stor on R7. According to the printing, this displays temp in C. REmove that and short R9, you don't need to use the 0 ohm part, just a wire or solder blob. Looks like if you short R8 you'll displat temp and humidit y. R9 shorted will be in F and not shorted and R7 shorted will be C. Will s horting the other two display =/-5% of temp also?

Reply to
4ctestsystems

It already displays temp and humidity without R8 being shorted. That's where I'm confused- maybe it will alternate the display? Here is a photo of the display as it is now:

formatting link

Reply to
m-m

I did and it works! I had to do it twice though. After moving it over, nothing changed. Then I saw there were printed brackets on the board that showed the R9 lugs were oriented horizontally, not vertically like the R7.

Thanks for your help!

Reply to
m-m

Ah, looking close, I see the brackets.

Reply to
4ctestsystems

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.