CoroFence 热成像检测器：Panasonic GridEye + PIR + IoT 集成

组件与物料

应用与在线服务

• Arduino IDE
• DasData Maker 数据存储通道

项目背景

疫情期间需非接触测温。GridEye 8x8 热电堆阵列可在 1.5-5 米范围测人体表面温度，视场角 60°，I²C 接口，1/10 fps。配合 PIR 触发测温，降低功耗。RGB LED 指示温度区间，蜂鸣器超温报警，数据上传 DasData 云平台。

传感器特性

• GridEye：64 像素，-20°C~100°C，I²C 快速模式，3.3V/5V 供电
• PIR：检测距离 5-12m，低功耗，数字输出

温度-颜色映射

if (tempC < 16) setColor(0, 0, 255);       // 蓝
else if (tempC < 20) setColor(80, 0, 80);  // 青
else if (tempC < 24) setColor(0, 255, 255); // 湖蓝
else if (tempC < 28) setColor(0, 255, 0);   // 绿
else if (tempC < 37) setColor(255, 255, 0); // 黄
else if (tempC < 38) setColor(255, 20, 20); // 品红
else { setColor(255, 0, 0); tone(buzzPin, 1000); } // 红+报警

核心代码

#include <Wire.h>
#include <SparkFun_GridEYE_Arduino_Library.h>

GridEYE grideye;
String heatData;
int ledState = 0;
unsigned long meetime;
uint16_t seconds = 3142;

int bluePin = 8, greenPin = 9, redPin = 10, buzzPin = 11;
int inputPin = 12; // PIR
int pirState = LOW, val = 0;
float tempC;

void setup() {
  pinMode(redPin, OUTPUT); pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT); pinMode(buzzPin, OUTPUT);
  pinMode(inputPin, INPUT);
  Wire.begin();
  grideye.begin();
  Serial.begin(115200);
}

void loop() {
  // 串口指令控制 LED 显示开关
  if (Serial.available() > 0) {
    char c = Serial.read();
    ledState = (c == '1') ? 1 : 0;
  }

  val = digitalRead(inputPin);
  if (val == HIGH) {
    if (pirState == LOW) {
      meetime = millis();
      Serial.println("Motion detected!");
      pirState = HIGH;
      getHeatmap();
      // LED 颜色指示 (同上映射)
      delay(1500);
    }
  } else {
    if (pirState == HIGH) {
      noTone(buzzPin);
      Serial.println("Motion ended!");
      setColor(0, 0, 0);
      meetime = 0;
      pirState = LOW;
    }
  }
}

void getHeatmap() {
  heatData = "";
  float previousVal = 0;
  for (unsigned char i = 0; i < 64; i++) {
    tempC = grideye.getPixelTemperature(i);
    heatData += String(tempC) + ",";
    if (previousVal > 37) {
      Serial.println("High temperature!");
      setColor(255, 0, 0);
      tone(buzzPin, 1000);
    }
    previousVal = tempC;
  }
  Serial.println();
  Serial.println(heatData);
}

void setColor(int r, int g, int b) {
  #ifdef COMMON_ANODE
    r = 255 - r; g = 255 - g; b = 255 - b;
  #endif
  analogWrite(redPin, r);
  analogWrite(greenPin, g);
  analogWrite(bluePin, b);
}

扩展与演示

• Node.js 串口终端实时显示热力图
• DasData 云平台数据建模分析：https://dasdata.co/camera/
• 蒸汽熨斗测试超温报警（视频演示）

原理图