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fix: no readings from air quality sensor 🐛 #327

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fix: no readings from air quality sensor 🐛 #327

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91 changes: 68 additions & 23 deletions examples/KIT/PM25/PM25.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,31 @@ float humd = 0.0;
#define X_OFFSET 160
#define Y_OFFSET 23

uint16_t CheckSum;
uint16_t CheckCode;
#define DATA_LEN 32

#define OUT_BAUD 115200
#define SENSOR_BAUD 9600

#define FIRST_START_BIT 66
#define SECOND_START_BIT 77

#define FRONT 2

bool firstStartBitIsRead;
bool secondStartBitIsRead;

uint8_t serial_bytes[DATA_LEN] = {0};
uint8_t currentByte = 0;

void resetSerial() {
currentByte = 0;

memset(serial_bytes, 0, sizeof(serial_bytes) / sizeof(serial_bytes[0]) * sizeof(serial_bytes[0]));

firstStartBitIsRead = false;
secondStartBitIsRead = false;
}


// Print the header for a display screen
void header(const char *string, uint16_t color) {
Expand All @@ -28,30 +51,30 @@ void header(const char *string, uint16_t color) {
M5.Lcd.setTextDatum(TC_DATUM);
M5.Lcd.drawString(string, 160, 3, 4);
}

void setup() {
M5.begin();
Serial.begin(9600);
Serial2.begin(9600, SERIAL_8N1, 16, 17);
Serial.begin(OUT_BAUD);
Serial2.begin(SENSOR_BAUD, SERIAL_8N1, 16, 17);
pinMode(13, OUTPUT);
digitalWrite(13, 1);

M5.Lcd.fillScreen(TFT_BLACK);
header("P M 2.5", TFT_BLACK);
}

uint8_t Air_val[32] = {0};
int16_t p_val[16] = {0};
uint8_t i = 0;
resetSerial();
}

#define FRONT 2

void LCD_Display_Val(void) {
uint16_t p_val[16] = {0};

for (int i = 0, j = 0; i < 32; i++) {
if (i % 2 == 0) {
p_val[j] = Air_val[i];
p_val[j] = serial_bytes[i];
p_val[j] = p_val[j] << 8;
} else {
p_val[j] |= Air_val[i];
p_val[j] |= serial_bytes[i];
j++;
}
}
Expand Down Expand Up @@ -142,16 +165,18 @@ void LCD_Display_Val(void) {
M5.Lcd.setCursor(X_LOCAL + X_OFFSET, Y_LOCAL + Y_OFFSET * 7, FRONT);
M5.Lcd.print("10um : ");
M5.Lcd.print(p_val[13]);

resetSerial();
}

void TempHumRead(void) {
temp = 0, humd = 0;

if (sht30.get() == 0) { // Obtain the data of shT30. 获取sht30的数据
temp = sht30.cTemp; // Store the temperature obtained from shT30.
// 将sht30获取到的温度存储
// 将sht30获取到的温度存储
humd = sht30.humidity; // Store the humidity obtained from the SHT30.
// 将sht30获取到的湿度存储
} else {
temp = 0, humd = 0;
// 将sht30获取到的湿度存储
}

M5.Lcd.setTextColor(TFT_GREEN, TFT_BLACK);
Expand All @@ -168,17 +193,37 @@ void TempHumRead(void) {
M5.Lcd.print(humd);
}

void loop() {
if (Serial2.available()) {
Air_val[i] = Serial2.read();
Serial.write(Air_val[i]);
i++;
} else {
i = 0;
void readCurrentBit() {
uint8_t bit = Serial2.read();

if (!firstStartBitIsRead) {
if (bit != FIRST_START_BIT) {
resetSerial();
return;
}
firstStartBitIsRead = true;
} else if (!secondStartBitIsRead) {
if (bit != SECOND_START_BIT) {
resetSerial();
return;
}
secondStartBitIsRead = true;
}

if (i == DATA_LEN) {
if (currentByte < DATA_LEN) {
serial_bytes[currentByte] = bit;
}

currentByte++;
}

void loop() {
if (currentByte >= DATA_LEN) {
LCD_Display_Val();
TempHumRead();
}

if (Serial2.available()) {
readCurrentBit();
}
}