Problems with RPR-220

[cwe-skov-dk]

Hi,

sorry, I did not find an e-mail address to contact, therefor I open this issue (which is not a real issue with your hardware).

I designed my own board with the same resistors connected to the RPR-220 and a Wemos D1 mini as controller.

The LED is faintly visible when pointing a mobile phone camera at it, not at all for the naked eye. Is this expected?

When my clock hand is over the RPR-220, I do see a minimal drop in the ADC reading, but nothing really significant, so in daylight indoors when hanging the clock on a wall looking at several windows, my calibration does not work any longer.

My question (I'm a software engineer, not a hardware guy): What could be wrong here, what voltage should I measure across the LED, what voltage drop should I expect on the photo sensor?

Thanks a lot for any hints!

[chwdt]

Never mind, I found the issue:

The device I used from some library had pins 3 and 4 reversed, so the photo sensor was connected wrong. I could fix this in my prototype by reinserting the photo sensor in reverse into the RPR-220 housing ;)

Always be careful when using libraries from other sources...