New! Version 3 comes with the latest module which has external antenna support and Pulse-Per-Second output
We carry a few different GPS modules here in the Adafruit shop, but none
that satisfied our every desire - that's why we designed this little
GPS breakout board. We believe this is the Ultimate
GPS module, so we named it that. It's got everything you want and more:
- -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
- >25Km altitude
- Internal patch antenna + u.FL connector for external active antenna
- Fix status LED
...all for under $40!
The breakout is built around the MTK3339 chipset, a no-nonsense,
high-quality GPS module that can track up to 22 satellites on 66
channels, has an excellent high-sensitivity receiver (-165 dB
tracking!), and a built in antenna. It can do up to 10 location updates a
second for high speed, high sensitivity logging or tracking. Power
usage is incredibly low, only 20 mA during navigation.
Best of all, we added all the extra goodies you could ever want: a
ultra-low dropout 3.3V regulator so you can power it with 3.3-5VDC in,
5V level safe inputs, ENABLE pin so you can turn off the module using
any microcontroller pin or switch, a footprint for optional CR1220 coin
cell to keep the RTC running and allow warm starts and a tiny bright red
LED. 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, we also provide the FIX
signal out on a pin so you can put an external LED on.
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! Most GPS antennas use SMA connectors so you may want to pick up one of our uFL to SMA adapters.
The other cool feature of the new MTK3339-based module (which we have
tested with great success) 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 anymore to reduce 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.
We've tested this version of the Ultimate GPS in a high-altitude balloon, and it kept fix up to 27km!
Comes with one fully assembled and tested module, a piece of header you
can solder to it for breadboarding, and a CR1220 coin cell holder. A CR1220 coin cell is not included, but we have them in the shop if you'd like to use the GPS's RTC
We have a nice fancy library for GPS usage, with background parsing and can set and query the built in GPS logging capability
(called LOCUS). A full tutorial is also available, which has tons of information about the module, how to use the data logger and more