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USB GPS Hammond

Page history last edited by MrTundraMan 10 years, 7 months ago

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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