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发表于 2021-9-30 12:52
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【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
实验二十二：MAX7219点阵显示模块（8X8 LED共阴）
项目三十：根据来自加速度计的相应输出，来确定 LED 的移动
实验开源代码
- /*
- 【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
- 实验二十二：MAX7219点阵显示模块（8X8 LED共阴）
- 项目三十：根据来自加速度计的相应输出，来确定 LED 的移动
- 接脚连线：
- MAX7219 UNO
- VCC →→→→→ 5V
- GND →→→→→ GND
- DIN →→→→→ D12（数据，数据接收引脚）
- CS →→→→→ D11（负载，命令接收引脚）
- CLK →→→→→ D10（时钟，时钟引脚）
- */
- #include <LedControl.h>
- #include <Wire.h>
- #define DEVICE (0x53) //ADXL345 device address
- #define TO_READ (6) //num of bytes we are going to read (two bytes for each axis)
- byte buff[TO_READ] ; //6 bytes buffer for saving data read from the device
- char str[512]; //string buffer to transform data before sending it
- int MATRIX_WIDTH = 8;
- LedControl lc = LedControl(12, 10, 11, 1); // DIN, CLK, CS, NRDEV
- unsigned long delaytime = 50;
- int x_key = A1;
- int y_key = A0;
- int x_pos;
- int y_pos;
- // object that represents a single light location
- // future update with gravity
- class Grain
- {
- public:
- int x = 0;
- int y = 0;
- int mass = 1;
- };
- Grain *g;
- void setup()
- {
- // set up a grain object
- g = new Grain();
- ClearDisplay();
- Wire.begin(); // join i2c bus (address optional for master)
- Serial.begin(9600); // start serial for output
- //Turning on the ADXL345
- writeTo(DEVICE, 0x2D, 0);
- writeTo(DEVICE, 0x2D, 16);
- writeTo(DEVICE, 0x2D, 8);
- }
- void loop()
- {
- // The first axis-acceleration-data register
- int regAddress = 0x32;
- int x, y, z;
- readFrom(DEVICE, regAddress, TO_READ, buff); //read the acceleration data from ADXL345
- // Combine the two bytes of each direction
- // Least significant bit first
- x = (((int)buff[1]) << 8) | buff[0];
- y = (((int)buff[3]) << 8) | buff[2];
- z = (((int)buff[5]) << 8) | buff[4];
- // Convert the values into values that can be represented on the matrix
- x = map(x, -300, 300, 0, 8);
- y = map(y, -300, 300, 0, 8);
- z = map(z, -300, 300, 0, 8);
- //we send the x y z values as a string to the serial port
- Serial.print("X: ");
- Serial.print(x);
- Serial.print(" Y: ");
- Serial.print(y);
- Serial.print(" Z: ");
- Serial.print(z);
- Serial.print("\n");
- ClearDisplay();
- // assign the grain to this location
- g->x = x;
- g->y = y;
- lc.setLed(0, g->x, g->y, true);
- //add some delay between each update
- delay(10);
- }
- void ClearDisplay()
- {
- // sets up the lcd display
- int devices = lc.getDeviceCount();
- for (int address = 0; address < devices; address++)
- {
- lc.shutdown(address, false);
- lc.setIntensity(address, 1);
- lc.clearDisplay(address);
- }
- }
- //Writes val to address register on device
- void writeTo(int device, byte address, byte val)
- {
- Wire.beginTransmission(device); //start transmission to device
- Wire.write(address); // send register address
- Wire.write(val); // send value to write
- Wire.endTransmission(); //end transmission
- }
- //reads num bytes starting from address register on device in to buff array
- void readFrom(int device, byte address, int num, byte buff[])
- {
- Wire.beginTransmission(device); //start transmission to device
- Wire.write(address); //sends address to read from
- Wire.endTransmission(); //end transmission
- Wire.beginTransmission(device); //start transmission to device
- Wire.requestFrom(device, num); // request 6 bytes from device
- int i = 0;
- while (Wire.available()) //device may send less than requested (abnormal)
- {
- buff[i] = Wire.read(); // receive a byte
- i++;
- }
- Wire.endTransmission(); //end transmission
- }
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