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Author Topic: Strange sensor module  (Read 251 times)

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Online Bealman

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Strange sensor module
« on: July 02, 2018, 03:43:40 am »
I was going through the bag of sensors which I got from China a few months ago, and while I can figure out what most of them are, there are a few weird ones.

Like this for example:



It appears to be an LED on the top of the PCB, with some strange rectangular thing on the other side.

I have no idea what this is. Any members got any ideas? Thanks!

« Last Edit: July 02, 2018, 03:45:51 am by Bealman »
Vision over visibility. Bono, U2.

Offline dodger

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Re: Strange sensor module
« Reply #1 on: July 02, 2018, 06:23:33 am »
It could be and infra red receiver with resistors to set the operating parameters. Unfortunately I cannot determine the pcb tracks to find the actual circuit.

Or it could be an infra red transmitter.

Dodger

Offline NinOz

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Re: Strange sensor module
« Reply #2 on: July 02, 2018, 06:25:55 am »
Looks like an opto coupler (most likely IR but could be visible band).  LED looking thing is an LED (Tx), opposing rectangular bit would be a photo transistor (Rx).  Would act as a simple on/off switch when something opaque is placed between.  Doesn't seem to be a reflective type as configured.
Sort of what one would use with a beam interruptor, say a rotating segmented disc or moving plate.
Of course could mount TX and Rx on leads and place across a track.
« Last Edit: July 02, 2018, 06:35:41 am by NinOz »
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Online Bealman

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Re: Strange sensor module
« Reply #3 on: July 03, 2018, 03:24:53 am »
Another couple of oddballs.... I apologise for the poor quality pics. The first appears to be a spring encased in a plastic box. The PCB calls it S1, so I assume it's some sort of switch, but can't see how it could work. There is also an SMD resistor on board.



The other has what appear to be mercury switches (small glass envelopes with a blob of mercury in them), but I cannot work out why they have LEDs alongside them.

I get the feeling that these are actually two sensors which have not been separated. However, I just can't imagine why the leds are there.

« Last Edit: July 03, 2018, 03:33:26 am by Bealman »
Vision over visibility. Bono, U2.

Offline NinOz

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Re: Strange sensor module
« Reply #4 on: July 03, 2018, 08:29:19 am »
First pic; can't see what it is but best guess from description is an accelerometer (crude type).
Second pic; best guess, without circuit diagram, is a mercury tilt switch (2 of) with indicating LED.
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Offline Fardap

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Re: Strange sensor module
« Reply #5 on: July 03, 2018, 08:36:35 am »
First one may be some sort of thermal switch?

Online Bealman

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Re: Strange sensor module
« Reply #6 on: July 03, 2018, 09:24:06 am »
Thanks for the input!  :thumbsup:

The thermal switch is a good suggestion, spring expands and makes or breaks a contact.

However the little plastic box worries me.

And, ah, the LED indicates conduction. Sounds good.

I've been testing these things  with raw 5V DC instead of instructions from an Arduino, and have managed to fry four.

LED output modules, that is.  :-[
Vision over visibility. Bono, U2.

Offline NinOz

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To be called pompous and arrogant - hell of a come down.
I tried so hard to be snobbish and haughty.

Online Bealman

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Re: Strange sensor module
« Reply #8 on: July 03, 2018, 10:32:42 am »
It does look like that, doesn't it.

Makes sense.... acceleration would be sensed as a voltage change that the Arduino could interpret with a PWM input.

Thanks!  :thumbsup:
Vision over visibility. Bono, U2.

 

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