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Add low pass filter information for ghost switching.

Michael Ingraham 2019-05-28 10:13:39 -04:00
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commit 102eb6f952
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FAQ.md

@ -196,6 +196,8 @@ Backlog LedPower 0; SetOption31 1
### My device randomly switches on and off. Do I have ghosts in my house?
Most of the issues with random, or "ghost", switching are related to MQTT retain settings. In short, your MQTT broker is retaining a message with the POWER status of the device which gets applied on reboots. [Solution here](PowerOnState-Configuration#side-effects-with-using-mqtt-messages)
In some cases, adding a switch to a device causes ghost switching. In this case, you may need to add a [low pass filter](https://www.youtube.com/watch?v=aq8_os6g13s&ab_channel=DrZzs) to dampen any spikes on the input. In the case of the Sonoff T1, a modification to [change the filter capacitor](https://github.com/arendst/Sonoff-Tasmota/issues/5449#issuecomment-478471697) on the PCB may be required.
This short [10 minute video by TheHookUp](https://www.youtube.com/watch?v=31IyfM1gygo&t=15s) nicely explains what it is and how to prevent it.
Other cause can be of electrical nature. Ff you have connected an external switch using long wires they can pick up stray signals and cause the voltage on the GPIO to vary. [Solution here](https://github.com/arendst/Sonoff-Tasmota/wiki/Expanding-Sonoffs#electrical-considerations)