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Adafruit Ultimate GPS v3 Breakout board for Arduino

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Tha Adafruit "Ultimate GPS" is one of the easiest GPS modules you can add to Arduino. Version 3 comes with the latest module which has external antenna support and Pulse-Per-Second output

Designed and built by Adafruit, this little GPS breakout board has got everything you want and more:

HAB compatible (High Altitude Ballooning), it weighs just 8.5g and works at altitudes up to 40km

  • -165 dBm sensitivity, 10 Hz updates, 66 channels
  • 5V friendly design and only 20mA current draw
  • Breadboard friendly + two mounting holes
  • RTC battery-compatible
  • Built-in datalogging
  • PPS output on fix
  • Internal patch antenna + u.FL connector for external active antenna
  • Fix status LED

The breakout module is built around the MTK3339 chipset, a high-quality GPS module that can track up to 22 satellites on 66 channels, it has an excellent high-sensitivity receiver (-165 dB), and a built in antenna. It is capable of 10 location updates a second, providing high speed, high sensitivity logging or tracking. Power usage is only 20 mA during navigation.

This board includes an ultra-low dropout 3.3V regulator. You can power it with 3.3-5VDC.

5V level safe inputs make it perfect for Arduino and other Microcontrollers

It has an ENABLE pin so you can turn off the module using any microcontroller pin or switch

An optional CR1220 coin cell to keep the RTC running and allow warm starts and a tiny bright red LED can be fitted to the underside. The cell holder is included loose for you to choose wether to fit it or not.

The LED blinks at about 1Hz while it's searching for satellites and blinks once every 15 seconds when a fix is found to conserve power.

If you want to have an LED on all the time, it also provides the FIX signal on an output pin so you can energise an external LED.

Two features that really stand out about version 3 MTK3339-based module is the external antenna functionality and the the built in data-logging capability. The module has a standard ceramic patch antenna that gives it -165 dB sensitivity, but when you want to have a bigger antenna, you can snap on any 3V active GPS antenna via the uFL connector. The module will automatically detect the active antenna and switch over.

The other feature of the new MTK3339-based module is the built in datalogging ability. Since there is a microcontroller inside the module, with some empty FLASH memory, the newest firmware now allows sending commands to do internal logging to that FLASH. The only thing is that you do need to have a microcontroller send the "Start Logging" command. However, after that message is sent, the microcontroller can go to sleep and does not need to wake up to talk to the GPS, reducing power consumption. The time, date, longitude, latitude, and height is logged every 15 seconds and only when there is a fix. The internal FLASH can store about 16 hours of data, it will automatically append data so you don't have to worry about accidentally losing data if power is lost. It is not possible to change what is logged and how often, as its hardcoded into the module but we found that this arrangement covers many of the most common GPS datalogging requirements.

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