The connections are 5V, GND, TX and RX, the baud rate comes set to 9600 but can be changed using a terminal console and AT commands also the name and pass code can be changed, the default pass code is 1234.
Once this was connected to my Arduino I put together a little sketch to simulate some shot data, a loop counting from 300 - 340 incrementing by one every 5 seconds (saved a lot of pellets ;-))
I've did attach the transceiver to the sensor tube (as seen in part6) for a quick trial with the pistol and it worked fine.
Next came a couple of days writing the Android app using the App Inventor site, this is what it looks like
First you power up the transceiver and pair it to your phone, the same way you would any other device then enter the data: pellet weight, the distance between the sensors, pellet name and then press calculate.
Once the calculations have been done and stored you can press the top right button to select the paired device, it shows up as "invor" or similar, if you've not renamed it, I renamed mine "Chrono1"
Once selected press the top left button to connect, when connected the shot data should appear in the Shot, FPS and FPE boxes with the average and max. data showing below.
If you tick the speech box then the FPE value will be spoken out loud to you by your phone, the quality of this function may vary between phones.
Also, I'm not an App developer, this is my first App therefore there could be other issues like screen resolution etc. I wrote this for my Galaxy S4 and haven't tried it on any other phones so I'm interested in any feedback.
It can be downloaded here.
I found another AI2 project I did, the only problem is that when you first start it there is an error but if you press the back button and add the settings and then exit it works OK the next time. you can try it here, AI2 Gallery link to app here
I intend to add other features in the future like multiple speech options and logging shot data to memory etc. it depends how popular it is.