Someone else has already done the hard parts for me yay! A few minutes of searching led me to Phillip Burgess‘ Trinket / Gemma Space Invader Pendant. I wanted to put together the Trinket, the 8×8 LED matrix and an I☬ sensor for a project I’m planning. Just want the code? Here you go: (16KB) or playanim.zip (20KB) Motivation

You may be interested in the other articles in the series.

Update: This article is part of a larger series on building an AVR-based compass. Also included: driving the Adafruit Mini 8×8 LED Matrix with I2C Backpack. Read on to see an example of how to do I☬ communication on the Trinket (or anything with an Atmel ATTiny85) while shaving every possible byte. One of the coolest things about it is that you can do I☬ (and communicate to lots of inexpensive sensors and displays using only two pins) and still have plenty of room left over for your code in the ~5.5KB of flash on board. For example, the construction of a solar food dryer by industrial arts students is described.The Trinket microcontroller from Adafruit Industries is a tiny and inexpensive (US$8 for a single unit) way to control your electronics projects. General areas addressed include energy sources, alternative energy sources, energy conservation, solar collectors/houses, fuels, utilities, and others addressing the needs of students in or subject matter focus of the areas previously indicated. Presented in the reports are energy-related activities, lessons, units, programs, information, and comments on the impact of the project on students. Reports, related to the project's third objective, are grouped by the following areas: primary intermediate secondary home economics secondary industrial arts secondary mathematics secondary science and secondary social studies. Included in this document are individual reports from teachers who participated in the project. Objectives of the Northern New Mexico Energy Education Project were to: (1) improve teachers' knowledge of energy-related subject matter and energy-related educational materials (2) develop continuing communication and cooperation between elementary and junior high staffs and the university on energy-related matters and (3) provide follow-up technical assistance to classroom teachers to prepare students for roles as citizens and consumers and to provide information on careers in energy-related fields.

Adafruit trinket 5v first project