Datasheet

Data Mode

By placing the BLEFriend module in 'UART Data' mode (set the mode selection switch to UART or setting the MODE pin to gound) you can use

the module as a 'tranparent UART connection' to the Bluefruit app. This makes data transfer super simple. Data is sent to the app when any 9600

baud data is received on the RXI pin and any data from the app is automatically transmitted via the TXO pin

In order to keep from overloading your microcontroller, you can use the flow control pins. Keep the CTS pin high until you're ready for more data,

then ground it to let the Bluefruit module know you're ready for more data!

This mode uses hardware flow control! You must set the CTS pin to ground in order to enable the TXO pin, so if you're wondering why its not

sending data, check that CTS is being used right!

You can determine if you are in Data Mode by looking at the mode LED. It should blink two times followed by a three second pause, as shown

below:

You can then connect the the app in UART mode and send/receive data transparently

https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-

friend

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