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Description

A program to measure the current temperature(and relative humidity, if supported by the sensor) using an ESP32 or ESP8266.
This program has a default mode in which the ESP runs continuously and outputs data frequently.
And a Deep Sleep Mode in which it is off for most of the time and outputs data less frequently.

Web Interface

This program shows the measurements on a simple web interface.
This web interface updates its values every 2 seconds using javascript.

This is what the web interface looks like:
web interface

The web interface also has dark mode support:
web interface dark mode

Deep Sleep Mode

Deep Sleep Mode is a operating mode where the ESP pushes metrics once, and then sleeps for a predefined time.
After that it wakes up and pushes metrics again.
This cycle is repeated indefinitely.
In this mode the Web Server and ArduinoOTA support are disabled.
Note: For this to work on the ESP8266 you need to connect the GPIO 16 to the RST pin.

Hardware support

A list of supported microcontrollers and temperature sensors.

Microcontrollers

A list of supported microcontrollers.

  • ESP32DevKitC
  • ESP8266DevKitC

Temperature sensors

A list of supported temperature sensors along with their required pull up resistor.
Format: Sensor(Pull Up Resistor)

  • DHT22(10ḲΩ)
  • DS18B20(4.7KΩ)

Requirements

  1. A supported microcontroller
  2. A supported temperature sensor
  3. The Pull Up Resistor for said sensor
  4. USB-Micro-B to USB-A cable
  5. PC with a working platformio installation

Getting Started

The steps to compile this project and flash it onto an esp.

  • Connect your esp to your temperature sensor. Wiring for the DHT22:

    ESP Pin DHT22 Pin
    5V VCC
    5V(10KΩ),GPIO5 Data
    GND GND

  • Create a wifissid.txt file containing the SSID of the wifi to connect to.

  • Create a wifipass.txt file containing the Passphrase for the wifi to connect to.

  • Create a otapass.txt file containing the password for ArduinoOta, allowing your to upload modified versions over wifi.

  • Create a mqttuser.txt file containing the username to use to connect to the MQTT broker.
    For technical reasons this is required even if you do not use MQTT.

  • Create a mqttpass.txt file containing the password for the MWTT broker.
    For technical reasons this is required even if you do not use MQTT.

  • Make sure these five files don't end with an empty line.

  • Attach the ESP to your PC using a USB-Micro-B to USB-A cable.

  • Build this project and flash it to the ESP by running pio run -t upload -e esp32dev for ESP32 or pio run -t upload -e esp_wroom_02 for the ESP8266.

  • To upload over WiFi after this project is installed run pio run -t upload -e esp32dev_ota for an ESP32 or pio run -t upload -e esp_wroom_02_ota for an ESP8266.

  • Run pio device monitor to open a serial connection.

  • Wait a few seconds for the ESP to finish booting.

  • Enter ip and press return to get the device ip.

  • Enter the IPv4 ip(for example 192.168.2.101) returned by this into your browser to see the web interface, showing your current temperature and relative humidity.

Integration

Information on available integrations can be found in the integration directory.