[closed] Pin 1 investigated
Joerg-rw opened this issue · comments
I cut loose pin1 from PCB, powered up the module (worked unchanged!) and probed pin1:
1.4mV against GND - so definitely no output.
However it has changed mode to "not retriggerable" . in line with the "old" pin function, so pin1 description on https://github.com/jdesbonnet/RCWL-0516 could use an update
/jOERG
Hello,
I`m totally confused at the moment... can anyone tell me the correct way to power this thing?
-3.3V On pin 1
or
->4V on pin "VIN"?
At the moment I have connected 3.3V (from rpi) to Pin 1 and it looks like it work like it should... but I`ve read that there is a LED on the board... but I do not see any powered LED. Now I have concerns that I do not use it the right way and that probably the detection range etc. does not work like it should in my case...
thank you very much
carl
-3.3V On pin 1
or
->4V on pin "VIN"?
both should work (though chip pin1 is MODE pin, the input -normally output- pad on PCB is labeled "3V3" and connects to chip VDD pin11. Label "VIN" pad is connected to chip pin8). I'm not sure
option#2 4V maybe are not sufficient, might need 4.5 or 5V. Spec says 4V though.
Option#1 works but is "undocumented" and so doublecheck if any unexpected effects show, particularly power consumption >>3mA. Also take care when using 3V3 as power input, the power supply connected to this needs to be super stable and clean, the slightest noise on 3V3 may cause false triggers
I`ve read that there is a LED on the board... but I do not see any powered LED.
There's no LED
Thank you very much... will try to connect vin to 5v and than stick to that (because one of my devices indeed has many false triggers... perhaps this is related to a "not perfect clean" power supply through the gpio from raspi