Logomatic v2 with GPS

Development Boards MicroMod
1

Hi folks,

I add an EM406 GPS model thougth the UART0 into the Logomatic. I had the following results:

  1. Logomatic log GPS data after switch ON using battery power

  2. Plug USB into PC. Switch ON no GPS data be logged

  3. Using Wall power with USB, the USB light ON. No GPS data logged.

Is the logomatic only works with battery? Anyone has the same result?

Thanks

2

Yes, as you’ve probably figured out by now, the Logomatic v2 requires a battery. It cannot function with just 5v provided by the usb port.

3

actually in the manual somewhere that it needs a battery to run on. For long time logging you are better off using a 500mA plug in power supply from you local 2$ shop or so.

4

I would like change the firmware to have the following functions:

  1. Log data using external power through USB (at same time charge the batt)

  2. When unplug the external power, it start use battery to log

Do we already have a similar project?

Thanks

5

As long as you have a battery connected, you can charge the battery and log data at the same time.

The first time after a reset or power-on, if the device is connected to a computer, it will start up in USB Mass-storage drive mode. To get it out of USB-drive mode, just disconnect it from the computer, it will boot up in normal logging mode. Once it’s in logging mode, you can reconnect it to the USB port, but this time it will stay in logging mode. This way you can use a computer for battery charging while the logomatic is logging.

BTW, I don’t think you can modify this behavior by just modifying the normal firmware. You’d have to mess with the bootloader.

6

whosywhatsit

I retest my Logmatic v2 logger following your instruction, it’s works! :slight_smile:

Can you log multi-sensors data at the same time? If you can, What’s the max number of sensor you can connect to logger(Text Mode)?

Thanks

7

MTrout, I haven’t yet been able to get one digital sensor to work, so I can’t help you too much. That said, some people have mentioned in other posts that the [Package Tracker does multiple sensors and is based on the same LPC2148. So, it might be possible to modify the [Package Tracker Firmware v1.4 to work on the Logomatic.](http://www.sparkfun.com/Code/Package_Tracker_v1-4.zip)](Package Tracker - GPS-08755 - SparkFun Electronics)