nodemcu-co2-temp-hum-grafana

Sensor that outputs:

• co2 from MH-Z19 sensor
• temperature and humidity from DHT11 sensor
• light from GL5528 resistor

This is modification of project http://www.crystalairfresh.ucoz.net

Wiring

• Connect MH-Z19 to pin 1 and 5v
• Connect DHT11 to pin 2 and 5v
• Connect light resistor to A0 (not so easy, don't want to explain)
• Connect PMS7003: SET to D6, RX to TX, TX to RX

Setup nodemcu

Flash firmware

Get firmware from https://nodemcu-build.com/ with modules:

• adc
• dht
• file
• gpio
• mqtt
• net
• node
• pwm
• tmr
• uart
• wifi

esptool.py --port COM3 write_flash 0x00000 /path/to/nodemcu_float.bin

Or compile it, using user_modules.h.

Set Wifi and MQTT credentials

Copy config-secrets.default.lua to config-secrets.lua and fill your credentials.

Upload

I am just open all lua files in ESPlorer and upload it, init.lua should be uploaded last.

Or you can install nodemcu-tool, change port address in Makefile and call make from project root:

make upload_all

Setup other

All docs below is obsolete after @418f481.

I am using it with Grafana, Telegraf and InfluxDB.

Generate json

Put file in cron:

#!/bin/bash

output_path="/path/to/co2-temp-hum-sensor.json"
location="room"

get_s() {
	echo "$1" | grep -oE "S$2=[0-9]+" | cut -d'=' -f2
}

line="$(nc -u -l 6650 -w 5 | grep -oE "S1=.+")"
echo '{"temp":'$(get_s "$line" 1)',"hum":'$(get_s "$line" 2)',"co2":'$(get_s "$line" 3)',"location":"$location"}' > "$output_path"

It should generate file such:

{"temp":25,"hum":32,"co2":452,"location":"room"}

Setup nginx

server {
   listen 80;
   server_name sensors.myhome;
   root /path/to/sensors/output_dir;
}

Setup Telegraf

Add to /etc/telegraf/telegraf.conf:

[[inputs.httpjson]]
    servers = [ "http://sensors.myhome/co2-temp-hum-sensor.json" ]
    name = "home"
    tag_keys = [ "location" ]

Setup Grafana

Import grafana-sensors-dashboard.json to Grafana.