Electronics > Beginners

LM35: resistance is futile

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malagas_on_fire:
Hi i'm here to correct my previous assumption of my invention about the zener diode which is in fact a regular 1n4148 diode to protect the sensor from back EMF .

Follow the recomendation about the capacitor which is also present in my sensor. I'll add a humidity sensor later.

PerranOak:
Cheers spec.

So I could use a 100nF X7R both on the LM35 and to decouple the microcontroller itself?

malagas_on_fire:
Yeah two near the power rails on the uC and the lm35 . If you have some random readings or glitches put the addional diode 1n4148 in reverse between positve and negative rails in between uC and lm35, near to the lm35

spec:

--- Quote from: PerranOak on November 07, 2018, 03:50:41 pm ---Cheers spec.

So I could use a 100nF X7R both on the LM35 and to decouple the microcontroller itself?

--- End quote ---
No probs :)

Yes, 100nf X7R is the 'standard' decoupling capacitor, but as David Hess pointed out, some three-terminal voltage regulators tend to be unstable with low ESR capacitors on their outputs, the LM337 for example.

But, if you want the real deal go for polypropylene (PP).  They used to be large and hellish expensive but with the latest technology they are quite small and reasonably priced. For analogue circuits, apart from really cost sensitive applications, I  tend to specify PP now: lower noise, lower distortion, no aging to speak of, stable capacitance with  changes in DC voltage and temperature...

I have a couple with cornflakes and milk every morning for breakfast ;D

PerranOak:
Cheers mate.

I shall sprinkle some on my toast!

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