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On the sonoff TH10/TH16 version 2.1 devices, the r1 is wired to GPIO4. No soldering required.

epandi 2019-01-03 20:00:31 +01:00
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Expanding-Sonoffs.md

@ -64,6 +64,8 @@ Instead of connecting a switch, you could connect a 4-pin 2.5mm jack, with the p
You can then plug a sensor into the jack like you would to a Sonoff TH10/TH16 and define what sensor you have connected to GPIO14
On the sonoff TH10/TH16 version 2.1 devices, the r1 is wired to GPIO4. No soldering required.
## Electrical considerations
When you switch a GPIO pin to an input and hang a long wire off of it, that wire can pick up stray signals and cause the voltage on the GPIO pin to vary. This can cause the system to think the switch has changed.