yanaginx / TimersandButtons

Getting familiar with using Timer in Arduino

TimersandButtons

Getting familiar with using Timer in Arduino

Timers and Buttons!

Objectives:

• Learn how to use a timer in Arduino

• Learn how to read digital inputs and display values via UART/LED using a timer

Problem:

In this week lab, you have to write a program that

• Has a timer which has an interrupt in every 10 milliseconds.

• Reads values of two buttons every 10 milliseconds. The read button function should be called inside the timer interrupt service routine.

• Increases the counter value when the first button is pressed.

• Increases the counter value automatically in every 0.5 seconds, if the first button is pressed in more than 1 second.

• Increases the counter value automatically in every 0.1 seconds, if the first button is pressed in more than 3 seconds.

• Decreases the counter value when the second button is pressed

• Decreases the counter value automatically in every 0.5 second, if the second button is pressed in more than 1 second.

• Decreases the counter value automatically in every 0.1 second, if the second button is pressed in more than 3 seconds.

• The above values such as 10 ms, 0.5 s, 0.1s, 1 s and 3 s are fixed values as an example. Your program, however, needs to provide an easy way to change those values. For example, you should use DEFINE to define those values.

• If both buttons are pressed, the first button has a higher priority than the second one.

Instructions:

Your task is

1. to using a breakboard, two buttons, and 7 LEDs to connect to the Arduino

2. to sketch an FSM that describes your idea of how to solve the above problem,

3. to write a firmware that runs on your Arduino board