Seg 1: How to use Arduino controller and button to control the blink of LED

3.1 Problem description: How to use Arduino controller and button to control the blink of LED

The previous two examples are relatively simple. When the corresponding codes are burn into the Arduino board, then the LED could blink. But it cannot interact with people. So, in our such experiment, by adding a new material, button, to control the blink of LED.

3.2 The required material

Table 3-1 the required material

Num

Name Qua Function Note

1

Arduino software 1 IDE Version 1.05

2

Arduino UNO board 1 board

3

USB line 1 burn

4

Dupont lines many Connection elements

5

LED 1 LED

6

Resistor (10, 200Ω) 2 Current limited

7

Breadboard board 1 connection

8

button 1 onoff

Before doing this experiment, we firstly introduce the relevant properties of botton.

Button

Button is an usual device in the design embedded system. By button, some instructions and data can be utilized to control the on/off states, which can control the run states of some devices. For example, in this experiment, by button, the high/low level is generated to control the blink of LED. But, there are many kinds of switches, such as a single switch in kitchen, double switches in bedroom, voice control switch in corridor, and so on. In our such experiment, we mainly use small/or miniature switches, as shown in Figure 3-1.


Figure 3-1 Miniature buttons

And the size of the miniature switch in this experiment is about 6*6*5mm and has four legs, which is shown in Figure 3-2.


Figure 3-2 Miniature button in this experiment

Note that, the two logs divided by a deep ditch is the same side. Its principle is also given out in Figure 3-2. If the button is pushed down, the four logs 1,2,3,4 would connected each other. Then this can trigger a high level to light the LED. But if you relax the button, 1,2,3,4 would be off


Figure 3-3 Schematics of button

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