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jdesbonnet / RCWL-0516

Information about RCWL-0516 microwave proximity switch module (ICStation.com SKU 10630)
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R-CDS operation inverted? #3

Open JeffreyRodriguez opened 7 years ago

JeffreyRodriguez commented 7 years ago

From the Readme:

R-CDS the VCC is in parrel connection with CDS(RCWL-9196 pin 9) through R-CDS. Connect the LDR at the R-CDS to turn off the detecting function at night. (?? TODO: make sense of this)

Perhaps this is setup to turn the detector on at night? I have a few PIR-activated LEDs around, and they spend the day charging.

I could be wrong here, still waiting for my modules to arrive.

dhharker commented 6 years ago

Yes I think you are right. I have added an explanation in #19.

xuancong84 commented 3 years ago

My understanding of the table row

CDS LDR 10-20k RL, U_LDR > 0.7V = On

and PCB labels is that for CDS and R-CDS, one is for adjusting the luminance threshold for triggering output (I guess it's CDS), the other is for inverting luminance response (whether to trigger in brightness or in darkness) (I guess it's R-CDS). However, since the 2 resistors have one common pin, they will interfere with one another. Not sure whether this is correct.

Joerg-rw commented 3 years ago

mounting a LDR in R18-CDS will cause enabled-in-dark mounting a LDR in R16-R-CDS and a sufficiently small pulldown R (say, 1kR, or a 10k brightness adjust trimmer) in R18 will cause enabled-in-light.

with LDR in R18-CDS you may solder a 4.7MR brightness adjust trimmer to R16-R-CDS