The Adafruit FLORA Wearable Ultimate GPS Module is described as ultimate because it's so small, thin, uses so little low-power and has data-logging built-in, it would be hard to imagine what else could be added. It has a few more plusses, such as the internal patch antenna with UFL connector and the array of location service signals it can receive. The MTK3339 GPS chip can track up to 22 satellites on 66 channels, is able to receive the SBAS signals from the WAAS (USA) and EGNOS (Europe) location augmentation services and use local DGPS signals. All these services add up to give the module excellent resolution of better than 3m and a velocity accuracy of 0.1m/s (0.2mph).
The built-in ceramic patch antenna should serve you well for most applications, but the module has a UFL antenna connector which can accept any 3V active GPS antenna. If the module detects an external antenna it will switch over automatically. Add a small coin cell battery to use it as a real-time clock taking advantage of the atomic clocks on board the GPS satellites. The module's internal microcontroller can be instructed to log the date, time and position every 15 seconds so long as it has a fix and it has power. If either is lost logging stops and resumes when both are present. Your external FLORA main board only has to send the start logging command and then it can go to sleep while the module does the rest. There's enough on board memory for 16 hours of data.
Adafruit provides a free tutorial to get you started, and just for fun they have a FLORA GPS jacket tutorial.
- Precision GPS module with datalogging
- Only uses 20mA in tracking mode
- 1 to 10 updates per second
- Uses additional regional location augmentation signals for greater resolution
- Satellite track prediction for faster time to first fix (TTFF)
- Part of the FLORA wearable collection
- Dimensions 30.5mm diameter x 6mm thick (1.2in. x 0.24in.)
- Adafruit part no.: 1059
*Customers looking to resell on eBay or Amazon should contact Adafruit directly.
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