A connected button for doing stuff. With Bluetooth Smart (aka BLE).

• Arduino FiniteStateMachine - installed in /lib
• Adafruit's nRF8001 Bluetooth Low Energy Breakout drivers

The first pass design of Sploder is pretty simple. Its a connected Thing, a button that can be used to start some action, somewhere.

By itself, Sploder won't do much, except light up a couple of LEDs. But if a device running the right kind of app is connected to Sploder via Bluetooth LE, that app can monitor the state of Sploder and react in any number of ways: changing it's own state, sending actions to other services, et cetera.

Sploder's firmware implements a simple Finite State Machine, an FSM, to make it simple to keep track of what Sploder is doing now (and what it should do next). Sploder has four basic states:

• startup
• ready
• armed
• firing

Sploder's FSM watches for three types of events for each state: entering, updating, or leaving. The events may occur automatically, or based on input to Sploder's sensor, i.e. it's arming or firing switches.

The startup state is the initial state when the Sploder device is turned on. Right now, this doesn't do much of anything except pause for a second, then immediate transition to the ready state.

The ready state is the default resting state of the Sploder. While in this state, Sploder sits around waiting for someone to flip its arming switch. Until that happens, Sploder is pretty boring.

The armed state is entered once the arming switch is flipped. At this point, Sploder will let the world know it's ready to go by lighting its armed LED. And it will start checking to see if the firing button is pressed or if someone has flipped the arming switch off again. The armed LED is disabled whenever this state is left.

The firing state occurs when the firing button is pressed while in the armed state. The firing LED is lit for one second, then the state is reverted back to armed.

Sploder is currently being developed using Platform.io.

If you want to hack on Sploder, clone the project, and make sure you've installed the library dependencies above.

See the Fritzing sketch for the Sploder circuit is available in docs. (Sorry for the outsized nrf on the schematic. Adafruit needs to fix some scale issues on some parts in their still-excellent Fritzing Library).

I am using an Arduino Pro Mini 3.3V for my Sploder implementation, but any Arduino should work just fine. I am powering my Sploder from a 3.7V LiPO battery, but anything that works from 3.7V-12V will probably work.

The Bluetooth LE interface is provided by Adafruit's nrf8001 Bluefruit LE Breakout. You can check out the guide for the nrf8001 board if you want detailed information on how to use it.

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