DHT11 Temperature driver
Introduction
The DHT11 driver for Temperature sensors is used in conjunction with the DHT11 sensor to measure the temperature of the sensor’s surroundings. The DHT11 measures temperature through the use of a thermistor. The DHT11 can also measure humidity via a variably resistant moisture absorbing substrate. Temperature and humidity measurements can be taken in tandem with each other. All data outputs are supplied via the data pin.
Driver Parameters
The DHT11 temperature driver for temperature sensing has two parameters that need to be configured:
Pin
This is the pin receiving input from the DHT11, any pin is suitable as long as it is not being used for other drivers beside the DHT11 Humidity driver. The DHT11 Humidity and the DHT11 Temperature driver can both access the same hardware and extract their respective values.
Resolution(F)/(C)
The resolution depends on the measurement system of the central core. If set to imperial, the resolution is in F (degrees Fahrenheit) and in metric it is in C (degrees Celsius).
The resolution in metric is ranging from 0 to 5 Celsius with a default value of 1.
The resolution in imperial is ranging from 0 to 9 degrees Fahrenheit with a default value of 1.
For example in in the metric system, if our latest reading was 25C and the resolution is set to 1.5, the builder base is not going to notify the central core unless the value is <23.5 or >26.5.
Wiring
Example
The GP0 pin is connected to Data Pin on the DHT11, the 3.3V and GND pins on the Builder Base are then connected to the VCC and GND pins on the DHT11.
Breadboard
Schematic
Used Pins
Used Pins | Description |
|---|---|
GP0 (can be any GP pin) | This pin receives data from the DHT11 |
3.3V | This pin provides the power |
GND | This pin provides the GND |
How to write an App
Navigate to the App Builder and create a new application. You can find the “Temperature” code object under the “Hardware” Tab in the object drop down menu on the left, or you can also use the search bar.
Drag the “Temperature” Object onto the canvas.
Next, locate the “Text” Object under the Interface tab and drag it onto the canvas.
Finally, connect the “Temperature” port from the Temperature Object to the “In” port on the Text object and save your application.
How to create a firmware
Navigate to the Firmware Builder and create a new firmware file.
Click the “+ Add Hardware” button which will open a modal window. Scroll down in the list to find the “Sensor” section and select the “Temperature” hardware option.
Give your device a name, and click “Add Device”
Next, select the “BMP280” driver under the driver dropdown menu.
For this example we select:
Pin: GP0
Resolution: 1
You may now save your firmware file and upload it to one of your clients.
Supported Hardware
DHT11
Downloads
Apps
Firmware
Assets