---
title: "PIR Sensor"
aliases:
    - tutorials/all/pir.html
    - tutorials/all/pir.md
    - chapter/tutorials/all/pir
---

This code reads PIR sensor triggers from this simple Passive Infrared (PIR) motion sensor and sends an HTTP request for every trigger, in this case to a [Domoticz](https://domoticz.com/) installation. When motion is constantly detected, this PIR sensor keeps the pin high, in which case this code will keep sending HTTP requests every 10 seconds (configurable with the hold_time variable).

## Main (`main.py`)

```python

import time
from network import WLAN
from machine import Pin
from domoticz import Domoticz

wl = WLAN(WLAN.STA)
d = Domoticz("<ip>", 8080 ,"<hash>")

#config
hold_time_sec = 10

#flags
last_trigger = -10

pir = Pin('G4',mode=Pin.IN, pull=Pin.PULL_UP)

# main loop
print("Starting main loop")
while True:
    if pir() == 1:
        if time.time() - last_trigger > hold_time_sec:
            last_trigger = time.time()
            print("Presence detected, sending HTTP request")
            try:
                return_code = d.setVariable('Presence:LivingRoom','1')
                print("Request result: "+str(return_code))
            except Exception as e:
                print("Request failed")
                print(e)
    else:
        last_trigger = 0
        print("No presence")

    time.sleep_ms(500)

print("Exited main loop")
```

## Boot (`boot.py`)

For more WiFi scripts, see the wlan step by step tutorial.

```python

import os
import machine

uart = machine.UART(0, 115200)
os.dupterm(uart)

known_nets = {
    'NetworkID':        {'pwd': '<password>', 'wlan_config':  ('10.0.0.8', '255.255.0.0', '10.0.0.1', '10.0.0.1')},
}

from network import WLAN
wl = WLAN()


if machine.reset_cause() != machine.SOFT_RESET:

    wl.mode(WLAN.STA)
    original_ssid = wl.ssid()
    original_auth = wl.auth()

    print("Scanning for known wifi nets")
    available_nets = wl.scan()
    nets = frozenset([e.ssid for e in available_nets])

    known_nets_names = frozenset([key for key in known_nets])
    net_to_use = list(nets & known_nets_names)
    try:
        net_to_use = net_to_use[0]
        net_properties = known_nets[net_to_use]
        pwd = net_properties['pwd']
        sec = [e.sec for e in available_nets if e.ssid == net_to_use][0]
        if 'wlan_config' in net_properties:
            wl.ifconfig(config=net_properties['wlan_config'])
        wl.connect(net_to_use, (sec, pwd), timeout=10000)
        while not wl.isconnected():
            machine.idle() # save power while waiting
        print("Connected to "+net_to_use+" with IP address:" + wl.ifconfig()[0])

    except Exception as e:
        print("Failed to connect to any known network, going into AP mode")
        wl.init(mode=WLAN.AP, ssid=original_ssid, auth=original_auth, channel=6, antenna=WLAN.INT_ANT)
```

## Domoticz Wrapper (`domoticz.py`)

```python

import socket
class Domoticz:

    def __init__(self, ip, port,  basic):
        self.basic = basic
        self.ip = ip
        self.port = port

    def setLight(self, idx, command):
        return self.sendRequest("type=command&param=switchlight&idx="+idx+"&switchcmd="+command)

    def setVariable(self, name, value):
        return self.sendRequest("type=command&param=updateuservariable&vtype=0&vname="+name+"&vvalue="+value)

    def sendRequest(self, path):
        try:
            s = socket.socket()
            s.connect((self.ip,self.port))
            s.send(b"GET /json.htm?"+path+" HTTP/1.1\r\nHost: pycom.io\r\nAuthorization: Basic "+self.basic+"\r\n\r\n")
            status = str(s.readline(), 'utf8')
            code = status.split(" ")[1]
            s.close()
            return code

        except Exception:
            print("HTTP request failed")
            return 0
```