USB GPS in Hammond Box Form Factor Revision X1
This PCB repackages the USB-GPS into a Hammond Box. There is a Revision X2 version of this board which has a smaller form factor but is otherwise functionally identical.
The Hammond box part number 1551KTBU is small form factor enclosure.
Board Layout/Routes
CPU I/O Pins
Pins
- PB6 - 3D Fix (from GPS) - alternates every second until lock then blinks shortly every 15 or so seconds
- PB4 - 1 PPS (from GPS) - not needed for tracking
- PB2 - DS2 programmable LED
- PB1 - DS3 programmable LED
- PD3 - GPS RX (CPU to GPS serial data line)
- PD2 - GPS TX (GPS to CPU serial data line)
Software/Firmware
- WinAVR - Windows based AVR development system
- DFU Bootloader - built into the ATMega32U4
- LUFA USB/Serial Project - turns the ATMega32U4 into a USB to serial interface
- FLIP tool - programs ATMega32U4 parts from the USB interface (Windows)
- DFU-Programmer tool - programs ATMega32U4 parts from the USB interface (Windows)
sudo dfu-programmer atmega32u4 erase
sudo dfu-programmer atmega32u4 flash USBtoSerial.hex
- MT3339 tool - Activates LOCUS, grabs logs and displays the map results
Measured - Current = 14 mA without GPS IC and without any LEDs on
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