DHT over BLE UART

In this example, the data obtained from a DHT temperature and humidity sensor are transmitted over a BLE UART service to a smartphone.

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Description

Bluetooth version 4.0 is known as Bluetooth Low Energy or BLE. It is also referred by other names such as Bluetooth smart or Wibree. It is low power variation of original traditional Bluetooth standard. Like Bluetooth, it is also managed and maintained by Bluetooth SIG. Due to low power consumption and low power sleep modes.

Details

Ameba RTL8722DM is a low-power dual-band WLAN and Bluetooth Low Energy SoC by Realtek. The RTL8722DM also include memory for Wi-Fi protocol functions and application making it simple for anyone to develop various kind of IoT applications. At the same time it has a wide range of peripheral interfaces. With all these interfaces, it can connect to most of the electronics components like LEDs, temperature and humidity sensors, and so on.

More Resources:

If you need additional technical documents or the source code for this project. Please visit the official websites and join the Facebook group and forum.

Ameba Official Website: https://www.amebaiot.com/en/
Ameba Facebook Group: https://www.facebook.com/groups/amebaioten
Ameba Forum: https://forum.amebaiot.com/

Components

1 × RTL8722DM_MINI Microcontroller
1 × DHT11 or DHT22 or DHT21

Build Instructions

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1

Setup

Connect the DHT sensor to the Ameba board following the diagram.
2

Programming

Ensure that a compatible BLE UART app is installed on your smartphone, it is available at:
– Google Play Store:
https://play.google.com/store/apps/details?id=com.adafruit.bluefruit.le.connecta>
https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal

– Apple App Store:
https://apps.apple.com/us/app/bluefruit-connect/id830125974

Open the example, “Files” -> “Examples” -> “AmebaBLE” -> “DHT_over_BLEUart”.
3

Final Results

Upload the code and press the reset button on Ameba once the upload is finished.
Open the app on your smartphone, scan and connect to the Ameba board shown as “AMEBA_BLE_DEV” and choose the UART function in the app.