3.2 MIKROE RN4870 Click Board
The RN4870 click board is a BLE board which can be inserted in the mikroBUS slot. It is powered by 3.3V and is connected to the host microcontroller by the USART peripheral, allowing control via ASCII commands. The board also provides support and channels for Ready-to-Send (RTS) and Clear-to-Send (CTS) USART signals, which are optional and will not be used in this application.
The RN4870 is a Bluetooth low-energy module. It has a completely integrated software based on the Bluetooth stack version 5.
The module supports transparent USART, which is used for data transfer from USART to a peer BLE device. The default baud rate is 115200 symbols/s, but it can be changed from the command interface. The USART data exchange is done through two channels, one for transmitting and one for receiving.
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The module supports Generic Attribute Profile characteristics (GATT), and it can implement up to five public and four private user-defined GATT services, each service providing up to eight characteristics.
When interfaced with a BLE-enabled smartphone or Bluetooth Internet Gateway, the applications can be monitored, controlled, and updated from anywhere in the world. Thus, the RN4870 module is perfect for IoT applications.