Hello. I created a sensor to measure gas consumption according to several instructions on the Internet. With the help of a reed switch (magnetic sensor), esp8266 and UPS with measuring the battery charge in the event of a power failure.
What we need:
Required:
- ESP8266 or ESP32 (I used ESP8266 wemos D1 for)
-Magnetic sensor (no matter what you use I used the cheapest available on aliexpress.) - USB mini connector with charger
Optional:
- External antenna if necessary and the gas meter is far from the router and the internal antenna does not reach)
- IPEX to SMA connector (depending on antenna type)
- RGB LED
- 1000kohm resistor and 220kohm resistor
- UPS whit 18650 battery
- box and cabling
Approach:
- Flash ESP8266 to esphome.
- Connect reed switch conncet to GPIO12 and GND.
- attach the sensor to the gas meter.
(I tried different positions. The best is more to the right according to the picture)
I didn’t use a 3D printer but I cut a small module from polystyrene and I mounted a reed switch on it, I connected everything with electrical tape).
- Connect rgb led to GPIO5 status led and GPIO13 counter led.
- Create battery status whit 1000kohm and 220kohm resistor
(instructions) . - Connect the ESP to the UPS module (it doesn’t matter which one you use. Important that the output must be 5V or 3.3V for ESP).
ESPHome code: (If you have a suggestion for improving the code then write to me.)
substitutions:
friendly_name: ESP-Gas
device_description: "Measure your natural gas consumption with the magnetic pulse of gas meter."
status_led: GPIO5
pulse_pin: GPIO12
pulse_rate: '100' # imp/m3
esphome:
name: esp-gas
platform: ESP8266
board: d1_mini_pro
# Enable logging
logger:
# Enable Home Assistant API
api:
ota:
password: "...."
wifi:
ssid: "wifiname"
password: "wifipass"
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Gas Fallback Hotspot"
password: "pass"
captive_portal:
# Sensors for ESP WIFI information
# Status LED for connection
status_led:
pin:
# Blue LED
number: ${status_led}
text_sensor:
- platform: wifi_info
ip_address:
name: "${friendly_name} - IP Address"
icon: mdi:wifi
#binary_sensor:
light:
- platform: binary
internal: true
id: led_red
name: Red
output: output_red
output:
- platform: gpio
pin:
number: D7
id: output_red
sensor:
# Battery status
- platform: adc
pin: A0
name: "ESP-Gas Battery"
accuracy_decimals: 3
update_interval: 120s
filters:
- multiply: 9.6
# Wifi signal
- platform: wifi_signal
name: "ESP-Gas Signal"
update_interval: 120s
# Gas meter
- platform: pulse_meter
pin:
number: ${pulse_pin}
mode: INPUT_PULLUP
on_value:
then:
- light.turn_on:
id: led_red
- delay: 0.5s
- light.turn_off:
id: led_red
internal_filter: 400ms
name: "${friendly_name} - Gas consumption"
filters:
- multiply: 0.06
unit_of_measurement: "mÂł/ min"
id: gas
accuracy_decimals: 2
icon: 'mdi:fire'
total:
name: '${friendly_name} - Gas total'
state_class: total_increasing
device_class: gas
unit_of_measurement: "mÂł"
accuracy_decimals: 2
filters:
- lambda: return x * (1.0 / ${pulse_rate});
Picture:
In Home Assistant:
The output of daily monthly and yearly consumption shows me bad value. Can you advise how to produce code for displaying correct values in m3. Well thank you.
EDIT:
(I modified the code (incorrectly entered sensor)
Home Assistant configuration.yaml code:
# Ultility meter m3
utility_meter:
#Gas consumption (day, month, year)
gas_consumption_daily:
source: sensor.esp_gas_gas_total
cycle: daily
gas_consumption_monthly:
source: sensor.esp_gas_gas_total
cycle: monthly
gas_consumption_yearly:
source: sensor.esp_gas_gas_total
cycle: yearly
sensor:
- platform: template
sensors:
# Gas consumption (ESP sensor gas total after restart send zero value)
gas_consumption:
unit_of_measurement: 'mÂł'
value_template: "{{ (states('sensor.esp_gas_gas_total') | float * 1) | round(2) }}"
# Price eur
gas_month_pric:
unit_of_measurement: '€'
value_template: "{{ (states('sensor.gas_consumption_monthly') | float * 0.512) | round(2) }}"
gas_year_pric:
unit_of_measurement: '€'
value_template: "{{ (states('sensor.gas_consumption_yearly') | float * 0.512) | round(2) }}"
Other projects:
Energy meter whit zigbee and bluetooth gateway
