PIR motion sensors, albeit called sensors, are configured as switches in Tasmota since they basically report motion (1) or no motion (0) to the device.
Most PIR's are single wire and they require connecting to VCC, GND and one GPIO. In this guide we will use GPIO15 as the pin that the PIR output is connected to.
Tasmota Configuration
In Configuration -> Configure Module menu change GPIO15 to Switch1.
If there already is a Switch1 simply choose the next in line. Same applies if you're connecting more than 1 PIR on a single device.
A configured PIR will not appear in the web UI in any form. To make it report like a sensor we need a rule that will send movement triggers to an MQTT topic.
SwitchMode1 1
SwitchTopic 0
Rule1 on switch1#state=1 do publish stat/%topic%/PIR1 ON endon on switch1#state=0 do publish stat/%topic%/PIR1 OFF endon
Rule1 1
You can change (PIR1) and the message (ON/OFF) to whatever suits your needs. %topic% is the configured device topic.
Look in console for motion detection messages [20:24:03] stat/%topic%/PIR1 ON to verify everything is working
optional:
Before using rules configure any GPIO that doesn't have anything connected to it as
Relay1.
This creates a dummy relay which is triggered by the PIR so you can see the changes in the web UI. This method is not recommended for daily use and should only be used for testing.
A more advanced example of rules with PIRs.
AM312
AM312 works even on 3.3v instead of 5v (like HC-SR501) which makes it perfect for ESP8266 devices without a 5V line (like Sonoff Basic). It is also less prone to false triggers due to Wi-Fi interference.
Pinout
Pin marked VOUT is connected to a free GPIO pin on the device.
This PIR goes to off state after a few seconds so we need to use this rule instead of the one in the example.
Rule1 on switch1#state=1 do backlog publish stat/%topic%/PIR1 ON; RuleTimer1 30 endon on Rules#Timer=1 do publish stat/%topic%/PIR1 OFF endon
With this it will stay ON for 30 seconds then send OFF message and the timer restarts every time there's an ON trigger.
Another use case as a hand wave switch.
HC-SR501
Pinout
