Can you explain 'flash of small pcb chip' Do you mean a flash of light from a LED chip on a pcb? Or do you mean a spark from a failing IC?rajbuddy007 wrote: ↑Tue May 14, 2019 2:09 pmHello,
I want to detect a flash of small pcb chip for that i want to use photodiode with rapsberry pi. Please suggest me what to do.
Here's the diode i am using
https://www.digikey.de/product-detail/d ... R5EALw_wcB
Are you paying us for the advice we give you?
You noticed that too?
Indeed. But they don't realize that the response from the other members will not be "that" detailed at all (like I did) or they even don't replay to it at all.
You have also a good statement as well. So maybe is indeed a good idea to take those answers with a grain of salt.Burngate wrote: ↑Wed May 15, 2019 10:43 amOr maybe they're just not very good at writing English, or expressing their wishes coherently and politely.
I can read "Just tell me how to ..." as an abrupt demand, or as a plea for simplicity - many of us here are very good at waffling, but less good at the clear guidance required. Me included, which is why I wouldn't make a decent teacher.
Brandon92 wrote: ↑Thu May 16, 2019 9:56 amI assume you have the pcb in a test fixture (see the pictures here) or something like this. In that case you would have 4 options I would think:
I hope this will give you some information.
- You can use the photodiode, but this require "more" hardware and possible a little bit of fine tuning.
- You could use a LDR. Then you only need a comparator and some resistors (a opamp would also work).
- If you have some test points, you could measure the voltage across the led during the test. If the led is good, the forwards voltage is according to the datasheet and if not the supply voltage is pressend.
- A other option would be this. Someone is already testing the pcb. And that person could check if that led is blinking.