Water Bottles

About this project

After we ran out of sparkling water twice in a row, I built a WiFi-connected scale that measures the amount of bottles based on the weight.

Build instructions

I wrote a blog post about this a while ago. You can find it here.

Code

esphome:

name: water_bottles

platform: ESP8266

board: d1_mini

wifi:

ssid: !secret wifi_ssid

password: !secret wifi_password

power_save_mode: none

# Enable fallback hotspot (captive portal) in case wifi connection fails

ap:

ssid: "Water Bottles"

password: !secret ap_fallback_password

captive_portal:

api:

ota:

logger:

sensor:

# Here we create a new sensor for the HX711 load cell amp.

- platform: hx711

name: "water_bottles_weight"

id: water_bottles_weight

dout_pin: D2

clk_pin: D1

gain: 128

update_interval: 60s # Defines how often the weight is sent to Home Assistant

filters: # We need to measure twice: once with 0g and once with

- calibrate_linear: # another known mass (12840g) and map these values to the

- 18595 -> 0 # readouts of the HX711 (see the logs and remove the filters: section)

- -296403 -> 12840

unit_of_measurement: g

# Create a new template sensor for the bottle count

- platform: template

name: "water_bottles_count"

# Get the weight and divide it by 1000 (because each bottle weights 1000g)

# We only return values >= 0, because obviously there can't be -1 bottles.

lambda: |-

auto n = floor(id(water_bottles_weight).state / 1000);

if (n > 0) return n;

return 0;

update_interval: 60s

accuracy_decimals: 0

# Uptime sensor

- platform: uptime

name: Water Bottles Uptime

# WiFi Signal sensor

- platform: wifi_signal

name: Water Bottles WiFi Signal

update_interval: 60s

switch:

# Switch to restart the node

- platform: restart

name: Water Bottles Restart