Arduino project #3 (love-o-meter)- no LED lights

THX.

I did not try looking closely at that picture first time round. Just didn't think to look! Iassumed there would be no legible markings.

@janosch1 has may well have destroyed any transistors that were ever part of a circuit that connects it directly across the power supply.

See page 9 in the book...

a7

Good morning guys, @oqibidipo @alto777 @Terrypin @build_1971

Sorry guys, why she? Any hint why :joy:? Nop, male. Anyway.

Thank you for support. :slightly_smiling_face:
So, what is the conclusion of the panel? What should I do next?

I suggest you find the black 3 legged thingy that has tmp written on it...

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janosch,

My TMP 36 arrived and the sketch works exactly as it should. Room temperature matches the 25.7 of an accurate thermometer alongside.

14:40:33.295 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68
14:40:33.389 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68
14:40:33.483 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68
14:40:33.576 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68
14:40:33.670 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68
14:40:33.811 -> sensor Value: 155, Volts: 0.76, degrees C: 25.68

I'm guessing I know why it didn't work for you.

When I first ran it I got almost identical results to yours, clearly wrong. I was sure I'd wired the sensor pins exactly as shown in the video tutorial. But a closer look revealed a crucial difference: the power rails are reversed. See the comparison below, with mine now correctly wired.

(Note: I didn't bother to complete the LED wiring after testing them during the earlier discussion.)

Alright! I ll do. Just give a sec.

@build_1971 Sorry mate. There is nothing in my kit like it with 3 pins. This must be the TMP.

What is 'this'???
The thingy with BC547 (on your photograph) is definitely not a tmp...

@build_1971 they misted to the TMP in the kit. You are right! It is marked with name
BCS47B

@build_1971 Its is transistor, like @oqibidipo showed in his post#39

BC547
Not S
It is one of the most common transistors...
Often together with its brother bc558 (or something close to that).

@build_1971 but you know what is def confusing? The TMP what @Terrypin is using and shown in his recent uploaded image, its looks, shape from above, absolute identical. :slightly_smiling_face:

Yes! Indeed! BC547 sorry! :grinning:

That is a standard housing...
There is maybe 20 common types of housings.
They are listed here:

https://www.matidavid.com/electronic_components/04.htm

@build_1971 I have found something. IRF520. Could be that the TMP or should the word TMP printed on the sensor?

No, that is a mos(?)fet.
Google is your ftiend...

Gotcha! Cheers! :smiley:

YES! I found the TMP! like in the post#39 from @oqibidipo. Amazing!

:partying_face: And guess what, the housing is the same as the BC547.

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Senor Value: 145, Volts: 0.71, degrees C: 20.80
Senor Value: 144, Volts: 0.70, degrees C: 20.31
Senor Value: 143, Volts: 0.70, degrees C: 19.82
Senor Value: 143, Volts: 0.70, degrees C: 19.82
Senor Value: 142, Volts: 0.69, degrees C: 19.34

:partying_face: :white_check_mark:

1 Like