I have finally had some time to work on the Bluetooth android app. Here is a screen shot of the very first working beta version.
For this test the WattsLeft with Bluetooth option was set to "CAN-DO Dbg" mode and the selector turned fully clockwise to the version number screen to allow broadcasting the EV-CAN data over Bluetooth. Pairing code is "1234" but I will be adding auto pairing code.
Top section will show most of the know data from the EV-CAN bus. It is dynamic and new items will be added as frames show up. These is one line for wheel speed that does not show right now since the car is parked.
The next section is a dump of the history data. The order right now is as it is stored in the WattsLeft memory. The letters indicate order of event with A being the newest and G the oldest. After the order letter is the duration of the event HH:MM:SS, starting gids number, ending gids number, gids difference (plus is charging, negative is driving), starting battery voltage and last ending battery voltage.
The bottom section is a live view of the EV-CAN frames in MsgID order (MsgID, eight bytes of data, count of frames received). The 1xx MsgIDs come in at around 100 per sec. I only update the screen 5 times per second right now but that will be user selectable.
I would like to add logging of history data where the current 7 events are merged into a file saved to the SD card. Maybe add plots of gids, voltage, SOC.
If you have a WattsLeft with the Bluetooth option and would like to beta test this App send me an email at WattsLeft.firstname.lastname@example.org
All the data received from WattsLeft is checked for transmission errors with CRC so you only see good data on the screen even if the connection is poor due to range between you and the car. I can walk around my house and see where the data stops coming in then move closer to the garage and have it start up again. There is a 25-30 sec timeout if the link is down too long. Then you need to move closer and manually reconnect.
Although not the lowest price, Fry's has these Fusion 2 no contract phones on sale for $59.99. You can use them out of the box with the phone part off as an android device with Bluetooth, WiFi and GPS.