IoT multisensor

Parts list

Through the control network, 24V is available throughout the house.

To operate the ESP's I used a DC-DC switching regulator MP1584EN.

Install Arduino IDE

The Arduino IDE from my debian package repository is very old.

To get a newer version of the Arduino IDE got to the Official Website and download your package.

cd ./Downloads
sudo tar xvJf arduino-1.8.12-linux64.tar.xz -C /opt
ls -lh /opt/
sudo -E /opt/arduino-1.8.12/install.sh

Now, you have to add the Debian 10 login user to the dialout, tty, uucp and plugdev group. https://linuxhint.com/install_arduino_ide_debian_10/

ESP8266

LIBs

To enable the esp8266 libs at Arduino IDE

• Go to File > Preferences -> Additional Board Manager URLs: http://arduino.esp8266.com/stable/package_esp8266com_index.json
• Tools > Board -> Boards Manager -> Search for ESP8266 and install

Dependency libs:

• git clone https://github.com/knolleary/pubsubclient.git

• git clone https://github.com/adafruit/DHT-sensor-library.git

• copy to ~/Arduino/libraries

MQTT Interface

• subscription topics (start with prefix(v01/esp/) + esp_name + topic_type)

• e.g. v01/esp/nodeMCUIBS/config/get_status

topic	meaning
/config/echo	just send an reply
/config/get_status[value: ""; status; prozess; heap]
/config/set_name [new name]	change name of esp (with prefix for topics)
/config/send_intervall_sensor [new time in ms]	e.g. "10000" for 10s
/config/send_intervall_status	watchdog with status information
/config/reset [dht, setup, vars]

GPIO

-	-	-	-
VCC	RST	CH_PD	TXD
RXD	GPIO0	GPIO2	GND

NodeMCU - multisensor

Features

• read temperatur / humility and publish cyclic

• read light lux and publish cyclic

• detect motion and publish at detection (on rising edge)

Pinout

node gpio pinout

GPIO sensoric

pin	DHT22	AM312	KY-018
1	VCC	VCC	GND
2	DATA=D7	OUT=D2/D5	VCC
3	nc	GND	DATA=A0
4	GND

NODE mcu platine soldered

GPIO	platine-color	device
D2	orange	pir 1 -> pin_2 (stairs)
D5	yellow	pir 2 -> pin_2 (corridor)
3V	red	pir1/2 -> pin_1
3V	violett	pir1/2 -> pin_1
gnd	blue	pir1/2 -> pin_3
gnd	grey	pir1/2 -> pin_3
A0	green	S
g	yellow	middle
VV	orange	-
D7	grey	DHT_2
3V	black	DHT_1
g	white	DHT_4

NODE mcu general

GPIO	device	GPIO	device
A0	KY-S [black]	D0
G	KY-middle [brown]	D1
VV	KY - [red]	D2	pir middle [orange]
S3		D3
S2		D4
S1		3V
SC		G
S0		D5	pir middle [yellow]
SK		D6
G	pir 3 [red/grey]	D7	DHT22 2 (signal) [orange]
3V	pir 1 [blue/green]	D8
EN		RX
RST		TX
G		G	DHT22 4 [red]
VIN		3V	DHT22 1 [brown]
-	===	===	-

3D Case

This is the 3D model of the case

Natural environment

Here you can see the sensor in the wild and the inside of it.