Arduino

2018年10月24日 (三) 17:48的版本

1 总览

Arduino I/O 之数字输入输出

Arduino I/O 之模拟输出

I2S 总线精要

2 扩展

Arduino Ethernet 的另一性价比选择 W5500 Ethernet Shield v1.0

DHT21/AM2301 数字温湿度传感器

DHT11 数字温湿度传感器

夏普 GP2Y1010AU0F 灰尘传感器

PT550 光敏二极管光线传感器

SHT20 数字温湿度传感器

PT100/PT1000 工业级温度传感器

扩散硅工业级压力传感器

SSD1306 OLED 显示屏

ILI9341 TFT 显示屏

Encoder 旋转编码器

MC105 可燃气体传感器

Digipot 数字电位器

Geiger 盖格计数器

Relay 继电器

Optocoupler 光耦

热感相机：Adafruit AMG8833 IR Thermal Camera https://www.adafruit.com/product/3622

3 应用

Arduino 监控客厅温度湿度

4 精华

Arduino bootloader 的烧写

5 MCU

5.1 LGT8F08/88/328 (AVR Compatible)

http://www.electrodragon.com/w/Logicgreen

5.2 LGT8F684/690, LGT8P653/663 (PIC Compatible)

5.3 STM32

6 糖豆

6.1 float2str

String(NUMBER, SCALE);
String(3.141592,5);        # "3.14159"

6.2 Software Serial

#include <SoftwareSerial.h>

SoftwareSerial mySerial(10, 11); // RX, TX

void setup()  
{
  // set the data rate for the SoftwareSerial port
  mySerial.begin(4800);
  mySerial.println("Hello, world?");
}

void loop()
{
  if (mySerial.available())
    mySerial.write(Serial.read());
}

6.3 AT CMD

SerialEvent() is called after a loop(), if there is serial data in the buffer.

String input_str = "";              // a string to hold incoming data
boolean str_over = false;           // whether the string is complete

void setup() {
  Serial.begin(9600);
  input_str.reserve(200);           // reserve 200 bytes for the inputString:
}

void loop() {
  if (str_over) {
    // Identify the CMD and processing

    input_str = "";                 // clear the string buffer
    str_over = false;
  }
}

/*
 * SerialEvent occurs whenever a new data comes in the hardware serial RX.
 * This routine is run between each time loop() runs, so using delay inside
 * loop can delay response.  Multiple bytes of data may be available.
*/
void serialEvent() {
  while (Serial.available()) {
    char in = (char)Serial.read(); 
    input_str += in;

    if (in == '\n') {                // read a line into string buffer
      str_over = true;
    } 
  }
}

6.4 Hex str to ull

char hexstr2bin(char c) {
 if (isdigit(c)) {  // 0 - 9
   return c - '0';
 } else if (isxdigit(c)) { // A-F, a-f
   return (c & 0xF) + 9;
 }
 return -1;
}

unsigned long long hexstr2ull(char * string)
{
  unsigned long long x =0;
  char c;
  do {
    c = hexstr2bin(*string++);
    if (c < 0)
      break;
    x = (x << 4) | c;
 } while (1);
 return x;
}