Pi Home Temperature Monitoring System -- Episode 562

To enable analysis of temperatures around the house, Andy built a monitoring system consisting of remote sensors and a centralised dashboard using Mosquitto MQTT Broker, Influx DB a time series database, Node Red the visual programming tool for the Internet of Things, and Grafana for charting and graphs.

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Bill of Material:

Product Name	Manufacturer	Quantity	Buy Kit
Pi Pico	Raspberry Pi	4	Buy Now
ESP8266 WiFi Serial Transceiver Module Breakout Board	Seeed Studio	4	Buy Now
Lipo Shim	Pimoroni	4	Buy Now
DHT11	DF Robot	4	Buy Now
Tactile Switch	ALCOSWITCH - TE CONNECTIVITY	4	Buy Now
0.1" Pin Header, 20 Way, 10 Pack	Harwin	1	Buy Now
PCB Receptacle, Board-to-Board, 2.54 mm, 2 Rows, 8 Contacts, Through Hole Mount	MULTICOMP PRO / AMPHENOL COMMUNICATIONS SOLUTIONS	4	Buy Now
Lipo Battery	MIKROELEKTRONIKA / Adafruit	4	Buy Now
IP65 Polypropylene Enclosure - 110x110x65mm -	ETERNA	1	Buy Now
Raspberry Pi 4	Raspberry Pi	1	Buy Now

Additional Parts:

Pico Zero Expansion Board (4)

USB to Sata adapter

SDCard

ATX Powersupply

MDF

Metal Mesh

Paint

3D Printer Filament

element14 presents | Andy's Profile | Project Videos

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itpilot over 2 years ago

Very nice project

I need to connect 3 x DHT22 Temperature and Humidity Sensors to my Raspberry PI 4

Where in the Code do I add the Additional DHT22 Sensors as i have them connected to required GPIO Pins on the Raspberry PI 4
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Workshopshed over 2 years ago in reply to itpilot

The code is designed remote sensors attached to the PiPico not directly connected to the Pi4.

Looking at the Arduino DHT11 library code, I suggest allocating one pin per device. And then creating multiple DHT objects which you could read in turn. You'd also want to update the message to be unique for each sensor.

If you wanted to use directly attached sensors this could also work, you could either mash up a python example for the temperature sensors and Matt and have it work the same as existing sensors.

www.raspberrypi-spy.co.uk/.../

Or you could cut out a step and read the sensors directly in NodeRed. Although I think that might require running NodeRed directly on the Pi rather than in a docker container.

flows.nodered.org/.../node-red-contrib-dht-sensor
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Workshopshed over 2 years ago in reply to itpilot

The code is designed remote sensors attached to the PiPico not directly connected to the Pi4.

Looking at the Arduino DHT11 library code, I suggest allocating one pin per device. And then creating multiple DHT objects which you could read in turn. You'd also want to update the message to be unique for each sensor.

If you wanted to use directly attached sensors this could also work, you could either mash up a python example for the temperature sensors and Matt and have it work the same as existing sensors.

www.raspberrypi-spy.co.uk/.../

Or you could cut out a step and read the sensors directly in NodeRed. Although I think that might require running NodeRed directly on the Pi rather than in a docker container.

flows.nodered.org/.../node-red-contrib-dht-sensor
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