Bluetooth Dartboard Project

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Notice:

This is my first time doing a project write-up. I am sure there are things that are missing. I am going to try to update this page as I think of more information to add/correct.

Parts/Materials

  • Dart Board
  • Coridium BASIC Chip
  • TTL serial bluetooth Module
  • LM317 voltage regualtor
  • Misc Wire/resistors/etc
  • Android Device with bluetooth


  • For the past couple of weeks we have been playing various dart games at work during lunch break. I thought it would be fun to interface with the electronic dart board so I could keep score/stats for my own custom game(s); Since I was not sure that my hacking would prove successful I opted to hack a cheap $12 dartboard that was laying around the office instead of the more expensive one used for lunchtime entertainment.

    As far as picking an MCU to interface to the dartboard I had an arduino pro mini and a Coridium BASIC Chip. I was not sure if the BASIC Chip would be right for this project. I had never used the BASIC Chip before so I decided to give it a try. There is nothing "basic" about the the BASIC Chip, its a fullblown 32bit MCU (Cortex M0) running at 50mhz with 22 digital I/O pins. The MCU comes in a 28pin PDIP and only require a 3.3v power supply and a TTL serial connection (FTDI etc) to program.

    At its core an electronic dartboard is just 62 switches/buttons that are "pressed" by the impact of the darts. These buttons are arranged in a 8x8 martix similiar to the diagram below.

    The dartboard is connected to the MCU via 8 input pins and 8 output pins. The MCU is connected to the bluetooth module via ttl serial. Below is a basic block diagram of the project.

    The code for the MCU is pretty simple. Until I get a chance to write up an explaination of the code you can Download BASIC Code Here

    Android Software

    I decided to use AppMobi's (disclosure, I work for AppMobi) HTML5 framework to make the "client" app for the dartboard. I chose to use html5/js because it wold allow me to rapidly develop the software. The peliminary version of the software is available here. Score keeping is currently not implemented. I plan to implement it in the future. (note: this app makes use of bluetooth serial functionality that is not currently part of the production AppMobi API's. However, you can press the "dice" button in the app to simulate a random dart hit. If I get requests I will create a bluetooth serial plugin for AppMobi Apps)


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