Connecting a gps receiver to a microcontroller is not a big deal. Most commonly the gps receiver sends its data, packed into NMEA format, as a serial stream over a serial port. But what to do with this data? For tracking purposes its just enough to save the datastream to a nonvolatile memory. But if you want to visualize the gps data on your device, for example show your actual position on a map you are facing two problems:

• You have to deal with a big amount of map data.
• The map data underlies restrictive copyright licenses.

OSM4Primer2 overcomes with this problems.

• Map data can be stored and recovered from the micro-sd card.
• Map data is derived from the OpenStreetMap project and only underlies the Creative Common Attribution-Share Alike license

So all you have to do is download the desired map data from OSM project and save it to the micro-sd card. OSM4Primer2 extracts the actual geografical position out of the NMEA datastream and correlates it to map data on the micro-sd card. As a result the position is shown on the map.

The project as a hole consists of three parts:

• a primer2 extension board with a gps receiver module with antenna. This module sends position data over a serial data stream to the usart2 of the primer2. This data stream is packed into the NMEA data format.

• a CircleOS application, that extracts position data from the data stream and loads the appropriate map from sd-card. Actual position is shown on the map.

• A pc host applications that downloads the desired maps from the OpenStreetMap project, and convert the original OpenStreetMap parts of the worldmap (so called „tiles“) into primer2 *.prm files that can be directly displayed on primer2 lcd

 Please download map data / see useful resources from www.amatronica.de