Add MH-Z14B CO2 Sensor

README.md

@@ -1,8 +1,3 @@
-# raspberrypi
+# Raspberrypi GPIO
 
-raspberrypi zero w GPIO 实现的智能家居
-- 参考:http://shumeipai.nxez.com/2016/06/26/raspberry-pi-diy-with-a-smart-home-server.html
-
-- 我发现传感器的数据是实时的,传感器的工作必须是实时的
-- 有时做不到数据的准确
-- 就做了多进程的shell(不同pid)来满足传感器数据现状,一个进程收集传感器数据,另一个进程处理数据.
+raspberrypi GPIO C 程序

gpio/Makefile

@@ -3,7 +3,7 @@ CC := $(CROSS_COMPILE)gcc
 STRIP := $(CROSS_COMPILE)strip
 CFLAGS += -g -O2 -Wall
 LIBS = -lwiringPi
-BIN = infrared light pin sound ultrasound wind dht11 dht12 helement key_light
+BIN = infrared light pin sound ultrasound wind dht11 dht12 helement key_light ch4 pasco2v01
 
 all: $(BIN)
 
@@ -28,6 +28,11 @@ helement: helement.o
 key_light: key_light.o
 	$(CC) $(CFLAGS) -o key_light $^ $(LIBS)
 
+ch4: ch4.o
+	$(CC) $(CFLAGS) -o ch4 $^ $(LIBS)
+pasco2v01: pasco2v01.o
+	$(CC) $(CFLAGS) -o pasco2v01 $^ $(LIBS)
+    
 .c.o:
 	$(CC) $(CFLAGS) -c $< $(LIBS)
 

gpio/ch4.c

@@ -0,0 +1,47 @@
+/*
+ *
+ * N55A甲烷气体传感器
+ *
+ */
+
+#include <wiringPi.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+void setup(int pin) {
+    wiringPiSetup();
+    pinMode(pin, INPUT);
+}
+
+int readMethaneLevel(int pin) {
+    int methaneDetected = digitalRead(pin);
+    return methaneDetected;
+}
+
+int main(int argc, char *argv[]) {
+    if (argc != 2) {
+        printf("Error: Invalid number of arguments.\n");
+        printf("Usage: %s PIN\n", argv[0]);
+        exit(1);
+    }
+
+    int pin = atoi(argv[1]);
+    if (pin < 0) {
+        printf("Error: Invalid PIN value.\n");
+        exit(1);
+    }
+
+    setup(pin);
+
+    while(1) {
+        int result = readMethaneLevel(pin);
+        if (result == HIGH) {
+            printf("CH4\n");
+        }
+        
+        delay(1000); // 每隔1秒读取一次传感器
+    }
+
+    return 0;
+}
+

gpio/light.c

@@ -7,49 +7,46 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-//#include <linux/type.h>
 #include <ctype.h>
 
 
-static int is_num(char *str)
-{
-    int i, len;
-    for (i = 0, len = strlen(str); i < len; i++) {
-        if (isdigit(str[i]) == 0) {
-            printf("不是数字\n");
-           return 1;
+int is_num(const char *str) {
+    while (*str != '\0') {
+        if (!isdigit(*str)) {
+            return 0;
         }
+        str++;
     }
-
-    return 0;
+    return 1;
 }
 
-int main(int argc, char *argv[])
-{
+
+int main(int argc, char *argv[]) {
     if (argc != 3) {
-        printf("Parameter error.\n");
+        printf("Error: Invalid number of arguments.\n");
+        printf("Usage: %s PIN VALUE\n", argv[0]);
         exit(1);
     }
 
-    if (is_num(argv[1]) == 1) {
-        printf("Parameter error, parameter 1 is PIN pin value\n");
+    int pin = atoi(argv[1]);
+    if (!is_num(argv[1]) || (pin < 0)) {
+        printf("Error: Invalid PIN value.\n");
         exit(1);
     }
 
-    if (is_num(argv[2]) == 1) {
-        printf("Parameter error, parameter 2 is true or false\n");
+    int value = atoi(argv[2]);
+    if (!is_num(argv[2]) || (value != 0 && value != 1)) {
+        printf("Error: Invalid value. Please enter 0 or 1.\n");
         exit(1);
     }
 
-    int pin = atol(argv[1]);
     wiringPiSetup();
 
     pinMode(pin, OUTPUT);
-    if (atol(argv[2]) == 1) {
-        digitalWrite(pin, HIGH);
+
+    if (digitalRead(pin) != value) {
+        digitalWrite(pin, value);
     }
-    if (atol(argv[2]) == 0) {
-        digitalWrite(pin, LOW);
-    }
-    return atol(argv[2]);
+
+    return value;
 }

gpio/mh-z14b.c

@@ -0,0 +1,71 @@
+/*
+ *
+ * MH-Z14B CO2 Sensor
+ * Based on Raspberry Pi wiringPi library
+ * Time: 20240109
+ *
+ */
+
+#include <stdio.h>
+#include <wiringPi.h>
+#include <wiringSerial.h>
+#include <unistd.h>
+
+// 校准
+static void calibration(int fd)
+{
+    // 校准传感器零点（ZERO）
+    char zero[9] = { 0XFF, 0X01, 0X87, 0X00, 0X00, 0X00, 0X00, 0X00, 0X78 };
+
+    write(fd, zero, 9);
+    delay(200);
+
+    return;
+}
+
+int main()
+{
+    int fd = 0;
+    char checksum = 0;
+    int High = 0;
+    int Low = 0;
+    int ppm = 0;
+    char read_command[9] = { 0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79 };
+    char data[9] = { 0 };
+
+    if ((fd = serialOpen("/dev/serial0", 9600)) < 0) {
+        printf("Unable to open device\n");
+        return 1;
+    } else {
+        printf("ttyAMA0 initialised ok\n");
+    }
+
+    while (1) {
+        // 写入读取命令
+        write(fd, read_command, 9);
+        delay(100);
+
+        // 读取
+        read(fd, data, 9);
+
+        checksum = (0xFF - (data[1] + data[2] + data[3] + data[4] + data[5] + data[6] + data[7])) + 1;
+        High = (int)data[2];
+        Low = (int)data[3];
+        ppm = (256 * High) + Low;
+
+        if (data[8] == checksum) {
+            for (int loop = 0; loop <= 8; loop++) {
+                printf("data%d: %X\n", loop, data[loop]);
+            }
+            printf("checksum: %X = %X\n", data[8], checksum);
+            printf("CO2 Concentration: %d ppm\n\r\n", ppm);
+        } else {
+            calibration(fd);
+            continue;
+        }
+
+        delay(3000);
+    }
+
+    return 0;
+}

gpio/pasco2v01.c

@@ -0,0 +1,65 @@
+/*
+ *
+ * CO2 PASCO2V01 传感器
+ *
+ */
+ 
+#include <stdio.h>
+#include <wiringPiI2C.h>
+
+// Pasco2V01 设备地址
+#define DEVICE_ADDRESS 0x76
+
+// 最大尝试次数
+#define MAX_RETRY 100
+
+int main() {
+    // 初始化 I2C 总线
+    int fd = wiringPiI2CSetup(DEVICE_ADDRESS);
+    if (fd < 0) {
+        printf("Failed to initialize I2C\n");
+        return -1;
+    }
+
+    // 发送命令开始测量
+    int result = wiringPiI2CWrite(fd, 0x00);
+    if (result < 0) {
+        printf("Failed to write command\n");
+        return -1;
+    }
+
+    // 等待传感器完成测量
+    int retry = 0;
+    while (retry < MAX_RETRY) {
+        int status = wiringPiI2CReadReg8(fd, 0x00);
+        if (status < 0) {
+            printf("Failed to read status\n");
+            return -1;
+        }
+
+        if (status & 0x08) {
+            break;
+        }
+
+        retry++;
+    }
+
+    if (retry >= MAX_RETRY) {
+        printf("Measurement timeout\n");
+        return -1;
+    }
+
+    // 读取测量结果
+    unsigned char data[3];
+    data[0] = wiringPiI2CReadReg8(fd, 0x02);
+    data[1] = wiringPiI2CReadReg8(fd, 0x03);
+    data[2] = wiringPiI2CReadReg8(fd, 0x04);
+
+    // 转换为浓度值
+    unsigned int concentration = (data[0] << 16) | (data[1] << 8) | data[2];
+
+    // 打印浓度值
+    printf("Gas Concentration: %u ppm\n", concentration);
+
+    return 0;
+}