Projects in Embedded Software

Hardware

For these projects, an Arduino Every with an ATmega4809 microcontroller was used. The microcontroller was mounted on a custom adapter board to allow compatibility with Arduino UNO R3 Shields. A custom board was attached to the adapter, which included 10 LEDs, 1 potentiometer, 2 buttons, and 1 variable frequency generator.

Software

All software was written in C, using interrupts for all timer based features.

Project 1

Cylon animation with voltage reading

The board is programmed to do the following

• Show a cylon animation (See appendix 1).
• When a button on the board is held, show voltage reading from potentiometer.
• Every 16 seconds, show a split view, voltage on the right, and cylon on the left.
• If voltage reading <= 3V, set cylon animation speed to 0.125S.
• If voltage reading > 3V, set cylon animation speed to 0.5S.

All time based functionality was implemented using interrupts.

Appendix

Appendix 1: Cylon

A cylon is a sequential activation of the LED:s.

1. Turn on LED 1
2. Turn off LED 1, and turn on LED 2.
3. Turn off LED 2, and turn on LED 3.
4. Repeat until you reach the end.
5. Reverse procedure

Appendix 2: ATmega 4809

For more information, see datasheet.

Appendix 3: Adapter board