Solar, Battery Temperature Logger

This was one of my first projects and the only battery powered one to date. This is actually build number three (V2.1).

As noted on my Weather Station project I will build the BME280 into that on the next build.

Build

Parts

My parts list was generally as follows:

Part	Description
ESP8266	V3 NodeMcu 4M bytes development board based ESP8266 ESP-12E for arduino CP2102
Charger	DFRobot Solar Lipo Charger (3.7V) V1.0
Sensor	BME280 5V 3.3V Digital Sensor Temperature Humidity Barometric Pressure Sensor Module I2C
Solar Panel	5VDC Solar Panel Power bank 840 mA
Battery	Lithium Ion Polymer Battery - 3.7v 2500mAh

In adddition I have a voltage divider between the battery output and pin A0 so I can measure the battery voltage.

ESPHome Code

I use ESPHome within my Home Assistant envirionment.

As this device goes into sleep mode I have used my mqtt broker to transport the data in lieu of the Home Assistant API:

esphome:
  name: e6_hillair
  platform: ESP8266
  board: nodemcuv2

wifi:
  ssid: !secret esp_wifi_ssid
  password: !secret esp_wifi_pword
  manual_ip:
    static_ip: 192.168.0.220
    gateway: 192.168.0.1
    subnet: 255.255.255.0

mqtt:
  broker: 192.168.0.10
  username: !secret mqtt_uname
  password: !secret mqtt_pword
  on_message:
    topic: e6_hillair/ota_mode
    payload: 'ON'
    then:
      - deep_sleep.prevent: deep_sleep_1

ota:

logger:

i2c:
#  sda: D2
#  scl: D1
#  scan: True

deep_sleep:
  run_duration: 15s
  sleep_duration: 10min
  id: deep_sleep_1

sensor:
  - platform: adc
    pin: A0
    name: "Battery"
    update_interval: 5s
    filters:
      - multiply: 13.6666667
  - platform: bme280
    temperature:
      name: "BME280_temperature"
      id: t1
    pressure:
      name: "BME280_pressure"
      id: p1
    humidity:
      name: "BME280_humidity"
      id: h1
    address:  0x76
    update_interval: 5s

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Last update: April 2, 2021