Getting data from external H/W and sending over BLE

[neil]

Hello, I'm new to bluetooth system.

I want to make some H/W device which using with sensor, MCU and Bluetooth.

Very simple, MCU control the sensor and get the data, transmit data to bluetooth chip. Bluetooth chip sending to smartphone.

First, I make this system by using bluetooth module, which use SPP Service. MCU is Arduino.

Just connect the Arduino's RX, TX pin to bluetooth module's TX, RX pin.

However, When I tried it by using nRF51DK, I find it's some difficult.

I have nothing to do with any serial communication between mcu and nrf51DK(UART, I2C, SPI anything is OK)

My data is less than 20bytes(it's range is 0 to 60000, positive integer)

Is there any good example for my situation? I tried to using experimental_ble_app_uart\pca10028, But it require must using console terminal in PC.

Thanks for reading my question.

[Hung Bui]

Hi Neil,

I don't see the difference between a UART terminal on PC and an external MCU connected via UART. If you don't use hardware flow control, you just need to connect the 2 lines RX and TX to the external MCU. If you use hardware flow control CTS and RTS lines are needed.

[neil]

Thanks for your answer, Hung How to don't using a hardware flow control? Just adjusting the simple_uart_config()? (delete cts_pin_number, rts_pin_number?) I think my fatal mistake is don't setup the CTS&RTS control

[Hung Bui]

@neil: sorry for late reponse. I was on a biz trip. You can choose not to use HWFC by using false in the HWFC input when calling simple_uart_config(), you can use any unused pin for CTS and RTS. I usually use pin 31.