bensimmo
Posts: 1923
Joined: Sun Dec 28, 2014 3:02 pm
Location: East Yorkshire

SenseHAT as Light meter?

Wed Jun 07, 2017 8:56 am

Is it possible or has anyone managed to do it?
Use the LED array as a light sensor.

I know the micro:bit now does this with its LED array, have any of the AstroPi challenges or hobbyist managed to get something similar working, if it is possible on the SenseHAT.


(Edit to add a link to the concept since they have a nice explanation https://lancaster-university.github.io/ ... t-sensing/)

jdb
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 1704
Joined: Thu Jul 11, 2013 2:37 pm

Re: SenseHAT as Light meter?

Wed Jun 07, 2017 2:51 pm

The matrix LEDs are all connected to digital logic. The driver IC (that drives at constant-current) is an open-drain type input and the column selects are driven via FET to 5V. Basically, no the LEDs can't be used as photodiodes.
Rockets are loud.
https://astro-pi.org

mob-i-l
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Re: SenseHAT as Light meter?

Sat Aug 26, 2017 9:03 am

But if you configure PD0-7 of ATTINY88 as inputs and vary RGB maybe you could measure some interval on PD0-7.
https://www.raspberrypi.org/documentati ... T-V1_0.pdf
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