Aeotec Sensor power modification.
Description
This is an external power supply modification for the Aeotec AEOEZWA005 TriSensor Z-wave sensor, the case design is common across other Aeotec products so will work for similar designs. The modification is non damaging, so if you want to return the sensor to battery operation, you can in seconds. There is a captive nut insert on the back so you can use the manufacturer's included adjustable mount with the modification. The sensor usually has a battery supply which limits how frequently you can send data back to your Z-wave hub, by default the sensor updates every 30 minutes, but you can set it as fast as every second, but this will drain your (expensive) battery very fast. By making this modification you can run the sensor off an external/USB power supply so you can configure fast updates without worrying about power usage. The modification makes use of an off the shelf Buck (voltage reduction) convertor that is available from Amazon, these are very easy to use, with clearly marked inputs and outputs, the output voltage can be adjusted by way of a small screw on top of the converter. You will need a multimeter to check the wiring of your USB to find the ground and power wires. These are typically the black and red wires, but it's best to check. I purchased some very cheap USB to 3.5 barrel connector cables and just cut the barrel connector off, but you can sacrifice any old USB cable you have lying around. The multimeter will also be needed to to adjust the Buck converter output, all mine came set to input 1:1 output so I could have damaged my sensors if I had used the buck converter without adjustment. If desired the Buck converter can reduce any voltage upto 40v down to the required 3v for this project. The converter will need to be readjusted if you change the input voltage. There is a print-in-place sliding latch on the replacement back, this may not come out properly if your printer is not super accurate. This should not be a problem as the print fits very snugly and should stay attached just by friction fit even if the sensor mount is used. The battery replacement part may need to be scaled depending on the size of the heads on your screws, I used dome cap screws where the head is about 1.5 mm tall. Bill of materials:- Aeotec Trisensor https://www.amazon.co.uk/gp/product/B07GPK2BKR 2x M3x10mm screws ~10 centimeters of 22 AWG cable. LM2596 DC to DC Buck Converter https://www.amazon.co.uk/gp/product/B07DYP6L35 USB power cable https://www.amazon.co.uk/gp/product/B009WJDR14
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