4f4ae933 |
1 | /* |
2 | This program is free software: you can redistribute it and/or modify |
3 | it under the terms of the GNU Affero General Public License as |
4 | published by the Free Software Foundation, either version 3 of |
5 | the License, or (at your option) any later version. |
6 | |
7 | This program is distributed in the hope that it will be useful, |
8 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
9 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
10 | GNU Affero General Public License for more details. |
11 | |
12 | You should have received a copy of the GNU Affero General Public License |
13 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
14 | */ |
15 | |
16 | // pin 13 controls the arduino's built-in LED |
17 | int led_pin = 13; |
18 | // connect the button to pin 2 |
19 | int button_pin = 2; |
20 | // initially, the button is not pressed. |
21 | // 0 means not pressed, 1 means pressed |
22 | int button_value = 0; |
23 | |
24 | void setup(){ |
25 | Serial.begin(9600);} |
26 | |
27 | void loop(){ |
28 | // see if you can figure out how this logic works |
29 | if(digitalRead(button_pin) != button_value){ |
30 | Serial.println("button state changed!");} |
31 | // read the value of the button pin during this loop, |
32 | // and save it in a box named "button_value" |
33 | button_value = digitalRead(button_pin); |
34 | // write the value to the led pin |
35 | digitalWrite(led_pin, button_value);} |