External power for Vibration/Temperature Sensor

Hardware
1

Purchased unit with external power supply option. It works with batteries installed. Do the batteries need to be installed when external power is applied to work?

2

No, if you move the switch to external power(away from the wall of the enclosure) batteries do not have to be installed.

3

That does not appear to work either. Any voltage min level?

4

If I’m not mistaken it should run all the way down to 5VDC. Did you flip the switch inside? Any way you can provide a photo with the sensor lid open?

5

Looks like it works when I increase voltage to >=12VDC but less than 13VDC

6

@Bhaskar can you comment on this?

7

I started voltage @ 4VDC and increased until it showed up in Alpha Station. One node required 12.5VDC and the other ~12VDC.

8

I am using a 3 A buck xformer.

9
  • Mini MP1584EN DC to DC buck converter module with a wide operating range
  • Input voltage: 4.5 V to 28 V; Output voltage: 0.8 V to 20 V
  • Output current: 3 A (maximum); Conversion efficiency: 92% (maximum)
  • Output ripple: less than 30 mV; Switching frequency: 1.5 MHz (highest), typically 1 MHz
10

can you share a picture of the board