Arduino

openhab.conf , conenction to mosquitto

mqtt:mysensor.url=tcp://10.0.1.10:1883
mqtt:mysensor.clientId=MQTT
mqtt:mysensor.qos=0
mqtt:mysensor.retain=true
mqtt:mysensor.async=false

Some of these modules come with pins soldered in that top right corner, so you don’t have to solder anything. You would simply connect a jumper wire to that pin that is highlighted in red (see Figure below). With my particular sensor I had to solder a small wire.
Here’s how it looks, now if you supply 3.3V through that red wire your module works at 3.3V.

powered by power supply module (lm2596)

• 2x connectors for Dallas temperature sensor
• 1 - photocell connector (light sensor)
• 1 DHT-22 connector (humidity and temperature)
• 1 connector for pir sensor (HC-SR501 PIR Motion Sensor Module)
• 1 connector for Relay (led light controller )
• 1 conenctor for Magnetic Door Switch Sensor
• 1 conenctor for power out (5v)

(this version has a 1117 3.3v regulator and 7805 5.0v)

• -is connected directly to the battery
• 2x connectors for Dallas temperature sensor
• 1 - photocell (light sensor)

(this version is reporting the battery level)

• 2x connectors for Dallas temperature sensor
• 1 - photocell connector (light sensor)
• 1 DHT-22 connector (humidity and temperature)
• 1 connector for pir sensor (HC-SR501 PIR Motion Sensor Module)
• 1 connector for PWM IRF3205 (led light controller )
• 1 conenctor for Magnetic Door Switch Sensor
• 1 conenctor for power out (5v)

(this version has a 1117 3.3v regulator and 7805 5.0v)