2 项目简介
红外热成像仪听起来是不是很酷、很高大尚? 它们可以清晰的显示出电路,发动机,管道,房屋隔热中的热量,可以用于消防红外热成像,医学,法医,环境科学,搜索和救援,能量监测红外热成像,化学反应,检测野生生物,检测侵入者中的热量。 它还能做什么? 在您的房子中找到最冷的地方? 微调超频游戏机中的冷却系统? 调查是否有人坐在您的躺椅上? 但是不幸的是这个相机的价格一直使它离我们遥不可及……直到现在。
红外热像仪突破性解决方案,使低分辨率热成像的成本大幅降低到大众能接受的程度。 它可以检测55度或110度视野内的32 x 24像素温度网格。 借助的一些额外功能,您可以将它变成自己的微型热像仪。
3 主要器件 3.1 红外摄像头模块
该传感器包含24x32的红外热传感器阵列。 连接到微控制器(或 Pi)后,它将通过I2C返回768个独立红外温度读数的数组。 就像那些很酷的热像仪一样,但是它紧凑而简单,易于集成。
3.1.1 模块特性
该块一款红外热像仪模块,32×24 像素,I2C 接口通信,兼容 3.3V/5V 电平,支持 Pi、
等主控。
我采用 远红外热传感器阵列,可精确检测特定区域和温度范围内的目标物体,
尺寸小巧,可方便集成到各种工业或智能控制应用中。
3.1.2相关参数 3.1.2 应用场景 3.1.3 接口说明(以接入 MCU 为例): 4 实现效果 4.1 STM32 LCD 图像显示
4.2 ESP32 LCD 图像显示
4.3 树莓派 HDMI 显示屏显示
5 部分相关驱动代码
#include
代码语言:javascript复制 #include "Adafruit_Arcada.h"
Adafruit_MLX90640 mlx;
Adafruit_Arcada arcada;
#if !defined(USE_TINYUSB)
#warning "Compile with TinyUSB selected!"
#endif
File myFile;
float mlx90640To[768]; // Here we receive the float vals acquired from MLX90640
#define DE_BOUNCE 200
// Wait this many msec between button clicks
#define MENU_LEN 12
// Number of total available menu choices
#define MENU_ROWS 9
// Number of menu lines that can fit on screen
#define MENU_VPOS 6
#define GRAY_33 0x528A
#define BOTTOM_DIR "MLX90640"
#define DIR_FORMAT "/dird"
#define BMP_FORMAT "/frmd.bmp"
#define CFG_FLNAME "/config.ini"
#define MAX_SERIAL 999
// BMP File Header, little end first, Photoshop ver.
const PROGMEM uint8_t BmpPSPHead[14] = {
0x42, 0x4D, // "BM" in hex
0x38, 0x09, 0x00, 0x00, // File size, 2360
0x00, 0x00, // reserved for app data 1
0x00, 0x00, // reserved for app data 2
0x36, 0x00, 0x00, 0x00 // Offset of first pixel, 54
};
// BMP 24-bit DIB Header, little end first, Photoshop ver.
const PROGMEM uint8_t DIBHeadPSP1[40] = {
0x28, 0x00, 0x00, 0x00, // Header size, 40
0x20, 0x00, 0x00, 0x00, // pixel width, 32
0x18, 0x00, 0x00, 0x00, // pixel height, 24
0x01, 0x00, // color planes, 1
0x18, 0x00, // bits per pixel, 24
0x00, 0x00, 0x00, 0x00, // Compression method, 0==none
0x00, 0x00, 0x00, 0x00, // Raw bitmap data size, dummy 0
0x12, 0x0B, 0x00, 0x00, // Pixels per meter H, 2834
0x12, 0x0B, 0x00, 0x00, // Pixels per meter V, 2834
0x00, 0x00, 0x00, 0x00, // Colors in palette, 0==default 2^n
0x00, 0x00, 0x00, 0x00 // Number of important colors, 0
};
// BMP file data, 2 byte padding
const PROGMEM uint8_t PSPpad[2] = {0x00, 0x00};
//Byte arrays of bitmapped icons, 16 x 12 px:
const PROGMEM uint8_t battIcon[] = {
0x0f, 0x00, 0x3f, 0xc0, 0x20, 0x40, 0x20, 0x40, 0x20, 0x40, 0x20, 0x40,
0x20, 0x40, 0x20, 0x40, 0x20, 0x40, 0x20, 0x40, 0x20, 0x40, 0x3f, 0xc0};
const PROGMEM uint8_t camIcon[] = {
0x01, 0xe0, 0x61, 0x20, 0xff, 0xf0, 0x80, 0x10, 0x86, 0x10, 0x89, 0x10,
0x90, 0x90, 0x90, 0x90, 0x89, 0x10, 0x86, 0x10, 0x80, 0x10, 0xff, 0xf0};
const PROGMEM uint8_t SDicon[] = {
0x0f, 0xe0, 0x1f, 0xe0, 0x3c, 0x60, 0x78, 0x60, 0x70, 0x60, 0x60, 0x60,
0x60, 0x60, 0x60, 0x60, 0x6f, 0x60, 0x60, 0x60, 0x7f, 0xe0, 0x7f, 0xe0};
const PROGMEM uint8_t snowIcon[] = {
0x15, 0x00, 0x4E, 0x40, 0xC4, 0x60, 0x75, 0xC0, 0x9F, 0x20, 0x0E, 0x00,
0x0E, 0x00, 0x9F, 0x20, 0x75, 0xC0, 0xC4, 0x60, 0x4E, 0x40, 0x15, 0x00};
uint8_t pixelArray[2304]; // BMP image body, 32 pixels * 24 rows * 3 bytes
// Some global values that several functions will use, including
// 5 floats to append to the BMP pixel data:
// coldest pixel, coldest color, center temp, hottest color, hottest pixel
float sneakFloats[5] = {3.1415926, 0.0, -11.7, 98.6, -12.34}; // Test values that get overwritten
uint16_t highAddr = 0, lowAddr = 0; // Append the pixel addresses, too
uint16_t backColor, lowPixel, highPixel, buttonRfunc = 1,
emissivity = 95, frameRate = 4,
thermRange = 0, paletteNum = 1, colorPal[256], // Array for color palettes
nextDirIndex = 0, nextBMPindex = 0, nextBMPsequence = 1; // These keep count of SD files and dirs, 0==error
uint32_t deBounce = 0, buttonBits = 0;
boolean mirrorFlag = false, celsiusFlag = false, markersOn = true,
screenDim = false, smoothing = false, showLastCap = false,
save1frame = false, recordingInProg = false, buttonActive = false;
float battAverage = 0.0, colorLow = 0.0, colorHigh = 100.0; // Values for managing color range
volatile boolean clickFlagMenu = false, clickFlagSelect = false; // Volatiles for timer callback handling
setup()函数首先执行,每次启动仅执行一次。 它的工作是初始化系统,从Arcada代码及其将控制的板载硬件开始,例如屏幕和按钮等。
然后一组测试确定闪存是否准备好接收新的BMP文件。
void setup()
{
if (!arcada.arcadaBegin()) { // Start TFT and fill with black
// Serial.print("Failed to begin");
while (1);
}
arcada.filesysBeginMSD(); // Set up SD or QSPI flash as an external USB drive
arcada.displayBegin(); // Activate TFT screen
arcada.display->setRotation(1); // wide orientation
arcada.display->setTextWrap(false);
arcada.setBacklight(255); // Turn on backlight
battAverage = arcada.readBatterySensor();
Serial.begin(115200);
// while(!Serial); // Wait for user to open terminal
Serial.println("MLX90640 IR Array Example");
if(arcada.filesysBegin()){ // Initialize flash storage, begin setting up indices for saving BMPs
if(!arcada.exists(BOTTOM_DIR)) { // Is base "MLX90640" directory absent?
if(arcada.mkdir(BOTTOM_DIR)) // Can it be added?
nextDirIndex = nextBMPindex = 1; // Success, prepare to store numbered files & dirs
} else { // "MLX90640" directory exists, can we add files | directories?
// Get the number of the next unused serial directory path
nextDirIndex = availableFileNumber(1, BOTTOM_DIR String(DIR_FORMAT));
// and the next unused serial BMP name
nextBMPindex = availableFileNumber(1, BOTTOM_DIR String(BMP_FORMAT));
}
} // By now each global index variable is either 0 (no nums available), or the next unclaimed serial num
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