Hardware    

The basis of our OSTC (Open Source Tauch-Computer) is a compact wrist unit. Manufactured using injection molding and user accessible internals.

Technical features (overview):

  • Microchip PIC18F4685 Processor
  • Dimensions: length 70mm, height 62mm, depth 28mm
  • Pressure sensor: 14 Bar absolut; accuracy +-20 mBar
  • Temperature sensor: 0.1°C resolution; accuracy +-1°C
  • Intersema MS5541B sensor for pressure and temperature
  • OLED-Display: 128x64 Pixel; available in yellow or green; 180° viewing angle
  • 128 kB non-volatile memory for profile data, 96 kB program memory, 3.3 kB SRAM
  • Real time clock
  • USB-interface
  • Easily replacable LiPoly accumulator for at least 40 h of battery life or two years in standby; rechargeable via USB-interface or optional external power supply
  • I²C, RS-232 and 10 Bit A/D for internal or external auxiliary modules

Schematic as PDF download

 


  

 

 

  • Compact USB interface
  • Mini-USB port
  • 3 LEDs for status display
  • Charges the battery using power from USB
  • Hidden Reset-button for OSTC (necessary for firmware updates)
  • Uses a FTDI FT232R USB Chip
  • The driver for Windows can be found here. They are included in Linux Kernel > 2.6.9
USB interface