Documentation

DHT Legacy Extension

The DHT Legacy extension uses the deprecated Adafruit_DHT library to gather temperature and humidity readings from a DHT device.

Warning

Deprecated in v0.11.0 — will be removed in a future release. The Adafruit_DHT library this extension depends on has been abandoned by Adafruit and is incompatible with Python 3.9+. All users should migrate to the DHT extension, which uses the actively maintained adafruit-circuitpython-dht library.

Overview

The dht_legacy extension connects to a digital humidity temperature (DHT) device to gather temperature and humidity readings. Through the support of Adafruit_DHT you can take readings with a DHT connected to a Raspberry Pi or Beaglebone Black.

This extension does not take an extension-level config and is focused on interfaces.

Sensor Interface

Provides a sensor that returns DHT readings.

Option	Type	Required	Description
`key`	String	Yes	Unique slug id for the component
`pin`	Integer	Yes	GPIO pin to use on board, e.g. `12`
`name`	String	No	Friendly display name of component. Useful for UI.
`model`	String	No	Model of DHT device to use. Options: `11`, `22`, or `2302`. Default: `11`

Config Example

Here is a config of a complete DHT Legacy sensor.

mudpi.config.json

{
  "sensor": [
    {
      "key": "dht_sensor_D12",
      "interface": "dht_legacy",
      "pin": 12,
      "model": "22"
    }
  ]
}

Data

Here is an example of the data returned by the DHT:

DHT Sensor Data

{
  "temperature": 50,
  "humidity": 64
}

Note

DHT is a finicky sensor and it has been known to have high read fail rates. ARMv6 may experience issues with DHT more frequently.

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