DIY serial rs232 Holux GM-210 GPS connector.

Here's the story. The cheapest GPS reciever I could find was the Holux GM-210 unit. It's a great unit since it supports both RS232 communication as well as TTL. This makes the unit very suitable for application with microcontrollers.

Unfortunately the GPS reciever requires a seperate supply voltage, and has an irritating mini-DIN connector.

Of course you can buy a special cable to wire up the GPS unit with a computer. This cable has a regular D-SUB 9 pins serial connector to fit into your PC, and it draws power from your PS2 port. This cable costed almost the same as the GPS reciever, and buying an off-the-shelf cable is just not my style.

I therefore decided to make a breakout-board from the mini-DIN to a proper D-SUB 9-pins RS232 connector, in order to make some perliminary tests with the GPS reciever connected to my computer, before starting interfacing with the GPS reciever through a microcontroller.

Power is supplied directly from the breakout-board with a 9v battery. Here's what I came up with:

DIY serial rs232 breakout-board for the Hilux GPS reciever
click to enlarge...

With this board you're able to the GPS unit with both commercially available and your own homemade software.

If you consider playing around with a GPS reciever, I can definatly recommend you to buy the Holux GM-210. It's very robuste, and has no problem getting a satelite fix even in tough conditions.

To help you save some money, or maybe to ease you in your work with interfacing this GPS unit with a microcontroller, I'm happy to be able to share my eagle schematic and board with you.

Eagle board and Schematic of the GPS breakout-board.
click to enlarge...

Well... That's all for now. I hope you will find my work usefull.

October, 2007. Written by David