WiFi curtain controller with rogue live wire

I was told about this exciting feature by Michael who had touched the antenna wire end while setting the device up. The button for programming it is right next to the wire, so it's easy to do.

Most devices like this have a bit of sleeve over the wire end to protect against accidental contact. With a bare live wire hanging out the risk of it coming into contact with adjacent metalwork is also high, and that could either short to ground, destroying the module, or potentially give someone a shock from random metal that shouldn't have posed a risk.

If you have one of these I would recommend adding a bit of insulating sleeve or tape to the end of the wire making sure the power is off when you do so. Even when used in a plastic enclosure there is a risk of getting a shock when changing the program settings.

Given that the rest of the module seems a relatively sensible design the omission of insulation seems a bit odd.

The unit is only intended to switch low current loads, so the circuitry looks relatively acceptable for that.

In hindsight, the resistor on the input circuitry may be to make it less sensitive to capacitively coupled current to the switch wires. By having a resistor there it poses a slight load that will shunt stray current. The zener may be purely to protect the capacitor from overvoltage.

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