TMP36, odd readings...

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bentwookiee
 
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Re: TMP36, odd readings...

Post by bentwookiee »

A decoupling cap ~0.1uF between the TMP36 VCC and ground helps, too, and is recommended in the datasheet.
... 0.1 μF bypass capacitor on the input. This capacitor should be a ceramic type, have very short leads (surface-mount is preferable), and be located as close as possible in physical proximity to the temperature sensor supply pin.
It continues...
The effect of RFI on these temperature sensors specifically and on analog ICs in general is manifested as abnormal dc shifts in the output voltage due to the rectification of the high frequency ambient noise by the IC.
Anything you can do to minimize noise will help smooth the output. Combined with software averaging and the above suggestions, you should be able to get accurate readings.

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