TelePyro

This is an 8-channel pyro expansion board for TeleMetrum.

Motivation

It would be nice to support more than the 2 channels of igniter control included in the stock TeleMetrum design, so that we can fly more complex projects involving staging, air starts, and backup ejection charges. We also want to experiment with better circuits for testing igniter continuity, with the hope of being able to measure actual resistance and not just continuity.

Features

User View

• Small circuit board mounted near TeleMetrum
• Requires TeleMetrum v0.2 or later, as v0.1 does not have the required companion board interface
• Connections for 8 distinct igniter firing channels provided
• Supports use of separate battery for ejection charges

Developer View

• Atmel ATtiny48 Microcontroller
  • 4k Flash
  • 256 bytes SRAM
  • 64 bytes EEPROM
  • 8-channel 10-bit ADC
  • SPI target interface
  • In-system programming interface
• Software Features (planned)
  • programmed in C using gcc-avr
  • Runs from on-chip flash, uses on-chip RAM
• Tools Used
  • gEDA for schematic capture and PCB layout
• Licenses
  • The hardware is licensed under the TAPR Open Hardware License
  • The software is licensed GPL version 2

Artifacts

A schematic exists on git.gag.com in the project hw/telepyro, but no prototypes have been built yet.