ESP-01board with DHT22
This little board has a DHT22 sensor and power regulator for a ESP-01 module.
The ESP-01 only offers only small flash sizes so it is recommended to load the minimal sketch with added support for the DHTElement on the ESP-01 by using one of the adapter options. See general ESP-01 board description.
This small board with the onboard regulator generates some intrinsic heat and the temperature measured by the sensor is some small amount above the real air temperature for this reason.
The sensor can easily be cut of and placed in some distance or outside the case. Here is a picture of this board prepared for an outside sensor.
A version prepared and configured for minimal power given by a solar panel can be found in the story Outdoor sensor with solar.
System configuration
This configuration enables the system and the dht element to get a sensor that can be watched using the browser UI.
The env.json file should only contain the system configuration:
{
"device": {
"0": {
"loglevel": 0,
"name": "esp01",
"title": "ESP-01 module",
"description": "ESP-01 module.",
"homepage": "/ding.htm"
}
},
"ota": {
"0": {
"port": 8266,
"description": "Listen for 'over the air' OTA Updates"
}
}
}Device configuration
The config.json file should contain the following configuration. More options are documented in the DHT Element description.
{
"dht": {
"0": {
"pin": "2",
"type": "DHT22",
"readtime": "30s"
}
}
}