24 Micro:bit with Arduino

(2017/12/18)

參考資料:https://learn.adafruit.com/use-micro-bit-with-arduino?view=all

這是一篇翻譯文，將上面參考文章再依樣畫葫蘆，重新做一次來好好學習這文章的知識

一、環境建置

• Install Windows 7 Driver(下載 mBed serial diver)

• Install SoftDevice onto MicroBit (下載 Micro:bit BTLE advertising Demo)

  • 不是很了解這個用途，好像是叫出【藍芽】的積木來取代【廣播】積木

  • 上面的程式，如下

• Add NRF5x Board Support

  • In Arduino, go to Preferences and add https://sandeepmistry.github.io/arduino-nRF5/package_nRF5_boards_index.json

  • 這也可參考之前的文章

二、點亮一顆燈的程式測試

• 簡易程式如下：

  • 1. const int COL1 = 3; // Column #1 control

    2. const int LED = 26; // 'row 1' led

    4. void setup() {

    5. Serial.begin(9600);

    6. Serial.println("microbit is ready!");

    8. // because the LEDs are multiplexed, we must ground the opposite side of the LED

    9. pinMode(COL1, OUTPUT);

    10. digitalWrite(COL1, LOW);

    11. pinMode(LED, OUTPUT);

    12. }

    14. void loop(){

    15. Serial.println("blink!");

    16. digitalWrite(LED, HIGH);

    17. delay(500);

    18. digitalWrite(LED, LOW);

    19. delay(500);

    20. }

• 結果：

• • 最左上角的那顆燈閃爍

• • • 如果要點亮其他燈，有如何處理？

三、在序列埠監視視窗呈現按A、B鍵

• 簡易程式如下：

  1. const int buttonA = 5; // the number of the pushbutton pin

  2. const int buttonB = 11; // the number of the pushbutton pin

  4. void setup() {

  5. Serial.begin(9600);

  6. Serial.println("microbit is ready!");

  7. pinMode(buttonA, INPUT);

  8. pinMode(buttonB, INPUT);

  9. }

  11. void loop(){

  12. if (! digitalRead(buttonA)) {

  13. Serial.println("Button A pressed");

  14. }

  15. if (! digitalRead(buttonB)) {

  16. Serial.println("Button B pressed");

  17. }

  18. delay(10);

  19. }

• 結果：

• • 從程式知道，當A鍵被按下時 digitalRead(buttonA)=0；當B鍵被按下時 digitalRead(buttonB)=0

四、其他腳位(Other GPIO)

• 腳位圖

• • 有一些腳位是與LED顯示器共用，如果要使用這些腳位就不要用顯示器。

    • Pin #0 - large pad - analog in

    • Pin #1 - large pad - analog in

    • Pin #2 - large pad - analog in

    • Pin #3 - analog in, also used for LED matrix

    • Pin #4 - analog in, also used for LED matrix

    • Pin #5 - also used for Button A

    • Pin #6 - also used for LED matrix

    • Pin #7 - also used for LED matrix

    • Pin #8

    • Pin #9 - also used for LED matrix

    • Pin #10 - analog in, also used for LED matrix

    • Pin #11 - also used for button B

    • Pin #12

    • Pin #13 - also available as SPI clock

    • Pin #14 - also available as SPI MISO

    • Pin #15 - also available as SPI MOSI

    • Pin #16

    • Pin #19 - also available as I2C clock

    • Pin #20 - also available as I2C data

  • So really, if you're using the buttons and LEDs(按鍵#5(A)、#11(B)；LEDS(3、4、6、7、9、10) )，其他可用有#0, #1, #2, #8, #12, #13, #14, #15, #16, #19 and #20. Which is still a good amount!

五、加速度計和磁力計

• 磁力計

  • 磁力計晶片 MAG3110

  • 下載Sparkfun's library磁力計函數庫(解壓後，放到arduino/libraries下)

  • 簡易程式如下：

    1. /* *********************************************

    2. * SparkFun_MAG3110_Basic

    3. * Triple Axis Magnetometer Breakout - MAG3110

    4. * Hook Up Guide Example

    5. *

    6. * Utilizing Sparkfun's MAG3110 Library

    7. * A basic sketch that reads x y and z readings

    8. * from the MAG3110 sensor

    9. *

    10. * George B. on behalf of SparkFun Electronics

    11. * Created: Sep 22, 2016

    12. * Updated: n/a

    13. *

    14. * Development Environment Specifics:

    15. * Arduino 1.6.7

    16. *

    17. * Hardware Specifications:

    18. * SparkFun MAG3110

    19. * Bi-directional Logic Level Converter

    20. * Arduino Micro

    21. *

    22. * This code is beerware; if you see me (or any other SparkFun employee) at the

    23. * local, and you've found our code helpful, please buy us a round!

    24. * Distributed as-is; no warranty is given.

    25. * *********************************************/

    27. #include <SparkFun_MAG3110.h>

    29. MAG3110 mag = MAG3110(); //Instantiate MAG3110

    31. void setup() {

    32. Serial.begin(9600);

    34. mag.initialize(); //Initializes the mag sensor

    35. mag.start(); //Puts the sensor in active mode

    36. }

    38. void loop() {

    40. int x, y, z;

    41. //Only read data when it's ready

    42. if(mag.dataReady()) {

    43. //Read the data

    44. mag.readMag(&x, &y, &z);

    45. Serial.print("X: ");

    46. Serial.print(x);

    47. Serial.print(", Y: ");

    48. Serial.print(y);

    49. Serial.print(", Z: ");

    50. Serial.println(z);

    51. Serial.println("--------");

    52. }

    53. }

  • 結果：

• • • 請注意，磁力計沒有校準，所以你會得到不同的數字在XYZ上，但是當你旋轉和旋轉mirobit的數字應該上下移動一點！ （這就是為什麼磁力儀必須校準）

• 加速度計

  • 有3軸加速度計

  • 下載akafugu MMA8653函數庫(解壓後，放到arduino/libraries下)

  • 簡易程式如下：

    1. /*

    2. * MMA845XQ test code

    3. * (C) 2012 Akafugu Corporation

    4. *

    5. * This program is free software; you can redistribute it and/or modify it under the

    6. * terms of the GNU General Public License as published by the Free Software

    7. * Foundation; either version 2 of the License, or (at your option) any later

    8. * version.

    9. *

    10. * This program is distributed in the hope that it will be useful, but WITHOUT ANY

    11. * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A

    12. * PARTICULAR PURPOSE. See the GNU General Public License for more details.

    13. *

    14. */

    17. #include "Wire.h"

    18. #include "MMA8653.h"

    20. MMA8653 accel;

    22. void setup() {

    23. Serial.begin(9600);

    25. Serial.println("microbit accel test");

    26. accel.begin(false, 2); // 8-bit mode, 2g range

    27. }

    30. void loop() {

    31. accel.update();

    32. Serial.print(accel.getX()); Serial.print(" , ");

    33. Serial.print(accel.getY()); Serial.print(", ");

    34. Serial.println(accel.getZ());

    36. delay(100);

    37. }

  • 結果：

• • • 這個函數庫是非常舊的和不完整的，所以在這個時候你只能使用它在8位模式。將上面改為如下

• 1. void loop() {

  2. accel.update();

  3. Serial.print((float)accel.getX() * 0.0156); Serial.print(" , ");

  4. Serial.print((float)accel.getY() * 0.0156); Serial.print(", ");

  5. Serial.println((float)accel.getZ() * 0.0156);

  7. delay(100);

  8. }