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SDS011.cpp
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// SDS011 dust sensor PM2.5 and PM10
// ---------------------
//
// By R. Zschiegner ([email protected])
// April 2016
//
// Documentation:
// - The iNovaFitness SDS011 datasheet
// Modified By Shachindra for Wake and Sleep Functionality
// June 12, 2019
#include "SDS011.h"
static const byte SLEEPCMD[19] = {
0xAA, // head
0xB4, // command id
0x06, // data byte 1
0x01, // data byte 2 (set mode)
0x00, // data byte 3 (sleep)
0x00, // data byte 4
0x00, // data byte 5
0x00, // data byte 6
0x00, // data byte 7
0x00, // data byte 8
0x00, // data byte 9
0x00, // data byte 10
0x00, // data byte 11
0x00, // data byte 12
0x00, // data byte 13
0xFF, // data byte 14 (device id byte 1)
0xFF, // data byte 15 (device id byte 2)
0x05, // checksum
0xAB // tail
};
static const byte WAKECMD[19] = {
0xAA, // head
0xB4, // command id
0x06, // data byte 1
0x01, // data byte 2 (set mode)
0x01, // data byte 3 (wake up)
0x00, // data byte 4
0x00, // data byte 5
0x00, // data byte 6
0x00, // data byte 7
0x00, // data byte 8
0x00, // data byte 9
0x00, // data byte 10
0x00, // data byte 11
0x00, // data byte 12
0x00, // data byte 13
0xFF, // data byte 14 (device id byte 1)
0xFF, // data byte 15 (device id byte 2)
0x06, // checksum
0xAB // tail
};
SDS011::SDS011(void) {
}
// --------------------------------------------------------
// SDS011:read
// --------------------------------------------------------
int SDS011::read(float *p25, float *p10) {
byte buffer;
int value;
int len = 0;
int pm10_serial = 0;
int pm25_serial = 0;
int checksum_is;
int checksum_ok = 0;
int error = 1;
while ((sds_data->available() > 0) && (sds_data->available() >= (10-len))) {
buffer = sds_data->read();
value = int(buffer);
switch (len) {
case (0): if (value != 170) { len = -1; }; break;
case (1): if (value != 192) { len = -1; }; break;
case (2): pm25_serial = value; checksum_is = value; break;
case (3): pm25_serial += (value << 8); checksum_is += value; break;
case (4): pm10_serial = value; checksum_is += value; break;
case (5): pm10_serial += (value << 8); checksum_is += value; break;
case (6): checksum_is += value; break;
case (7): checksum_is += value; break;
case (8): if (value == (checksum_is % 256)) { checksum_ok = 1; } else { len = -1; }; break;
case (9): if (value != 171) { len = -1; }; break;
}
len++;
if (len == 10 && checksum_ok == 1) {
*p10 = (float)pm10_serial/10.0;
*p25 = (float)pm25_serial/10.0;
len = 0; checksum_ok = 0; pm10_serial = 0.0; pm25_serial = 0.0; checksum_is = 0;
error = 0;
}
yield();
}
return error;
}
// --------------------------------------------------------
// SDS011:sleep
// --------------------------------------------------------
void SDS011::sleep() {
for (uint8_t i = 0; i < 19; i++) {
sds_data->write(SLEEPCMD[i]);
}
sds_data->flush();
while (sds_data->available() > 0) {
sds_data->read();
}
}
// --------------------------------------------------------
// SDS011:wakeup
// --------------------------------------------------------
void SDS011::wakeup() {
for (uint8_t i = 0; i < 19; i++) {
sds_data->write(WAKECMD[i]);
}
sds_data->flush();
while (sds_data->available() > 0) {
sds_data->read();
}
}
#ifndef ESP32
void SDS011::begin(uint8_t pin_rx, uint8_t pin_tx) {
_pin_rx = pin_rx;
_pin_tx = pin_tx;
SoftwareSerial *softSerial = new SoftwareSerial(_pin_rx, _pin_tx);
softSerial->begin(9600);
sds_data = softSerial;
}
#endif
void SDS011::begin(HardwareSerial* serial) {
serial->begin(9600);
sds_data = serial;
}
void SDS011::begin(HardwareSerial* serial, int8_t rxPin, int8_t txPin) {
serial->begin(9600, SERIAL_8N1, rxPin, txPin);
sds_data = serial;
}
#ifndef ESP32
void SDS011::begin(SoftwareSerial* serial) {
serial->begin(9600);
sds_data = serial;
}
#endif