Fairly simple remote control for smart phone app.

[JohnBrown]

I am hoping to develop a device that works as a remote control for a smart phone app. There will be at least 5 buttons, and as the button presses will be infrequent, I am hoping to be able to run the device from a coin cell. The smartphone app only needs to be notified when a button is pressed. Which of the examples, if any, would make the best starting point for such a project?

[Nguyen Hoan Hoang]

there is a good example code just for that with iOS on this blog site http://embeddedsoftdev.blogspot.ca/p/ehal-nrf51.html

The Blinky_be example on this blog allows you to control all 30 i/o pin. The iOS App configure the pin direction (IN or OUT). The iOS App can turn On or Off each i/o pin are all 30 at once. It make use of 2 characteristics. One for configuration, the other for data.

Other examples showing control of LED matrix multi-display where you can type a text on iOS and send it to the Matrix displays. This examples make use of long characteristic write where you can send more than 20 bytes of data.

A UART examples with long write. UART data in/out using one characteristic. iOS App serving as dump terminal.

All examples are updated with SDK6 and SD7 and all projects were created from scratch using Eclipse IDE based project.

[JohnBrown]

Thanks, I will look at that. Just to be clear, though, I don't want to control the nrF51822 from the iPhone, I want to control the iPhone from the nRF51822.

[Nguyen Hoan Hoang]

It does not matter which controls which. The examples show the communication between iOS and nRF51822. The data you receive from the nRF51822 on iOS is up to you to do what you need. The control can be both ways actually. It is up to you to the final step.