Global warming or....?????

[rudeguy]

 

[highland145]

Welcome to rudeguy's hell.

 

[Rubycon]

Most likely a sensor failure.
Many circuits use a counter with a diode bridge.
The counter starts at the upper limit (in this case it's what you see displayed) and count downward. The resulting value is the temperature. If the sensor is missing/damaged etc. the display will always show the starting value.

 

[ShawnD1]

Most likely a sensor failure.
Many circuits use a counter with a diode bridge.
The counter starts at the upper limit (in this case it's what you see displayed) and count downward. The resulting value is the temperature. If the sensor is missing/damaged etc. the display will always show the starting value.

Interesting. Thanks ruby!

 

[Ninjahedge]

I like the +


Maybe it should say "K" and not "F"........

 

[Jeff7]

Weird that it's >256. Guess they don't use 8-bit integers...or proper error-trapping.
(Sure it's great that it might be able to read temps that high, but if that was the outdoor temperature, I don't think anyone would give a damn about reading the sign. )


The temp sensor we use here at work puts out a linear 0-2.5V signal, which correlates to -40°F - 126.5°F. An ADC on a microcontroller reads the value and translates it to a temperature value, which is then sent to a display controller.

If there's no sensor hooked to the input, you can get weird values when the ADC reads the value of any noise on the input pin.

 

[hanoverphist]

generally, the ones we use are 4-20mA output, and are scaled from 0-250 deg. if the loop gets broken, it shows a -25% value, or -62.5 degrees. they also look like faces.