Note:  The Eggtimer Classic has been discontinued as of July 2023, we are leaving this page on our web site in case you need the documentation/firmware.


Eggtimer Classic Assembly Instructions RevD

Eggtimer Classic User’s Guide

Eggtimer RevD Drilling Template

Eggtimer Classic RevD Parts Placement Guide

Using PuTTY with an Eggtimer 

Driver Circuit for the AUX Channels


IMPORTANT NOTE:  DO NOT try to perform a firmware update with any loads attached to the deployment outputs!   Although the chance of them firing during an update is virtually zero, it’s very bad safety practice to have any pyrotechnic loads connected to an altimeter when the rocket is not being prepped for flight.

Eggtimer Software v1.53 

Note:  We generally do not post older versions of the firmware, unless there is an incompatibility with the currently-shipping version of the hardware.   We recommend that you check our site regularly for firmware updates, and update your firmware to the latest release if applicable.

Eggtimer Classic Release Notes

How to Update the Flash on Your Eggtimer Classic 

Win-AVR Software (link)