prometheus-esp8266-dht-expo.../README.md

# Prometheus ESP8266 DHT Exporter

[![GitHub release](https://img.shields.io/github/v/release/HON95/prometheus-esp8266-dht-exporter?label=Version)](https://github.com/HON95/prometheus-esp8266-dht-exporter/releases)

An IoT Prometheus exporter for measuring temperature and humidity, using an ESP8266 (Arduino-compatible) with a Wi-Fi module and a DHT (temperature + humidity) sensor.

## Metrics

| Metric | Description | Unit |
| - | - | - |
| `iot_info` | Metadata about the device. | |
| `iot_air_humidity_percent` | Air humidity. | `%` |
| `iot_air_temperature_celsius` | Air temperature. | `°C` |
| `iot_air_heat_index_celsius` | Apparent air temperature, based on temperature and humidity. | `°C` |

## Requirements

### Hardware

- ESP8266-based board (or some other appropriate Arduino-based board).
    - Tested with "Adafruit Feather HUZZAH ESP8266" and "WEMOS D1 Mini".
- DHT sensor.
    - Tested with a cheap DHT11 from eBay and "Wemos DHT Shield" (using pin 2).
    - DHT11 supports a maximum of 1Hz polling while DHT22 supports a maximum of 2Hz polling.
    - Both DHT11 and DHT22 support both 3V and 5V at 2.5mA max current.

### Software

- [Arduino IDE](https://www.arduino.cc/en/Main/Software)
    - Download and install.
- [esp8266 library for Arduino](https://github.com/esp8266/Arduino#installing-with-boards-manager)
    - See the instructions on the page.
- [DHT sensor library for ESPx](https://github.com/beegee-tokyo/DHTesp)
    - Install using the Arduino library manager.
    - You can also try the Adafruit one, but that one didn't work for me.

## Building

### Hardware

Using the "Adafruit Feather HUZZAH ESP8266".

Wire the DHT sensor power to the 3.3V and any GND on the ESP and wire the data output to e.g. pin 14 (aka D5).

### Software

Using the Arduino IDE.

1. Copy `config.default.h` to `config.h` and fill inn the details.
1. Open `src/src.ino` in the Arduino IDE.
1. Set the correct settings for the board.
    - WEMOS D1 Mini uses board "WeMoS D1 R2 & mini".
    - Adafruit Feather HUZZAH ESP8266 uses "Adafruit Feather HUZZAH ESP8266".
1. Build and upload using the Arduino IDE.

## Version

See `src/version.h`.

It's set manually since no build tools (or CI) other than the Arduino IDE is used.

## License

GNU General Public License version 3 (GPLv3).
Update README 2020-06-27 19:17:33 +00:00			`# Prometheus ESP8266 DHT Exporter`
Update README.md 2020-06-27 11:44:57 +00:00
Add info metric and prep release 2020-06-29 11:39:10 +00:00			`[![GitHub release](https://img.shields.io/github/v/release/HON95/prometheus-esp8266-dht-exporter?label=Version)](https://github.com/HON95/prometheus-esp8266-dht-exporter/releases)`

Update README.md 2021-06-12 16:54:38 +00:00			`An IoT Prometheus exporter for measuring temperature and humidity, using an ESP8266 (Arduino-compatible) with a Wi-Fi module and a DHT (temperature + humidity) sensor.`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
Add info metric and prep release 2020-06-29 11:39:10 +00:00			`## Metrics`

			`\| Metric \| Description \| Unit \|`
			`\| - \| - \| - \|`
Update README 2021-09-30 00:33:05 +00:00			\| `iot_info` \| Metadata about the device. \| \|
			\| `iot_air_humidity_percent` \| Air humidity. \| `%` \|
			\| `iot_air_temperature_celsius` \| Air temperature. \| `°C` \|
			\| `iot_air_heat_index_celsius` \| Apparent air temperature, based on temperature and humidity. \| `°C` \|
Add info metric and prep release 2020-06-29 11:39:10 +00:00
Update docs and config template 2020-09-29 14:24:01 +00:00			`## Requirements`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
Update docs and config template 2020-09-29 14:24:01 +00:00			`### Hardware`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
Update docs and config template 2020-09-29 14:24:01 +00:00			`- ESP8266-based board (or some other appropriate Arduino-based board).`
			`- Tested with "Adafruit Feather HUZZAH ESP8266" and "WEMOS D1 Mini".`
			`- DHT sensor.`
Update README 2021-09-30 00:33:05 +00:00			`- Tested with a cheap DHT11 from eBay and "Wemos DHT Shield" (using pin 2).`
Update docs and config template 2020-09-29 14:24:01 +00:00			`- DHT11 supports a maximum of 1Hz polling while DHT22 supports a maximum of 2Hz polling.`
			`- Both DHT11 and DHT22 support both 3V and 5V at 2.5mA max current.`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
Update docs and config template 2020-09-29 14:24:01 +00:00			`### Software`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
Improve initial code, but my sensor seems to be broken 2020-06-27 17:50:42 +00:00			`- [Arduino IDE](https://www.arduino.cc/en/Main/Software)`
			`- Download and install.`
			`- [esp8266 library for Arduino](https://github.com/esp8266/Arduino#installing-with-boards-manager)`
			`- See the instructions on the page.`
Replace DHT sensor library 2020-06-27 18:21:31 +00:00			`- [DHT sensor library for ESPx](https://github.com/beegee-tokyo/DHTesp)`
			`- Install using the Arduino library manager.`
Update docs and config template 2020-09-29 14:24:01 +00:00			`- You can also try the Adafruit one, but that one didn't work for me.`
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00
			`## Building`

Update docs and config template 2020-09-29 14:24:01 +00:00			`### Hardware`

			`Using the "Adafruit Feather HUZZAH ESP8266".`

			`Wire the DHT sensor power to the 3.3V and any GND on the ESP and wire the data output to e.g. pin 14 (aka D5).`

			`### Software`

			`Using the Arduino IDE.`
Improve initial code, but my sensor seems to be broken 2020-06-27 17:50:42 +00:00
Update README and clone similar project as starting point 2020-06-27 12:20:19 +00:00			1. Copy `config.default.h` to `config.h` and fill inn the details.
Update docs and config template 2020-09-29 14:24:01 +00:00			1. Open `src/src.ino` in the Arduino IDE.
Improve initial code, but my sensor seems to be broken 2020-06-27 17:50:42 +00:00			`1. Set the correct settings for the board.`
			`- WEMOS D1 Mini uses board "WeMoS D1 R2 & mini".`
Update docs and config template 2020-09-29 14:24:01 +00:00			`- Adafruit Feather HUZZAH ESP8266 uses "Adafruit Feather HUZZAH ESP8266".`
Improve initial code, but my sensor seems to be broken 2020-06-27 17:50:42 +00:00			`1. Build and upload using the Arduino IDE.`
Add OpenMetrics output 2020-06-27 19:16:23 +00:00
Add info metric and prep release 2020-06-29 11:39:10 +00:00			`## Version`
Add OpenMetrics output 2020-06-27 19:16:23 +00:00
Add info metric and prep release 2020-06-29 11:39:10 +00:00			See `src/version.h`.

			`It's set manually since no build tools (or CI) other than the Arduino IDE is used.`

			`## License`

			`GNU General Public License version 3 (GPLv3).`