DigitalInfinity/ESP32-PaxCounter
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

initial

Browse Source
This commit is contained in:
August Quint 2020-01-21 14:51:41 +01:00 committed by GitHub
parent 04850fd5c7
commit 4edff01a37
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 191 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

191
lib/SDS011/src/SDS011.cpp Normal file
View File

@ -0,0 +1,191 @@
// SDS011 dust sensor PM2.5 and PM10
// ---------------------
//
// By R. Zschiegner (rz@madavi.de)
// April 2016
//
// Documentation:
// - The iNovaFitness SDS011 datasheet
//
// modified by AQ - 2018-11-18
//
#include "SDS011.h"
static const byte SDS_SLEEP[] = {
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 SDS_START[] = {
0xAA, 0xB4, 0x06, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x06, 0xAB};
static const byte SDS_CONT_MODE[] = {
0xAA, 0xB4, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x07, 0xAB};
static const byte SDS_VERSION[] = {
0xAA, 0xB4, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x05, 0xAB};
const uint8_t SDS_cmd_len = 19;
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() {
SDS_cmd(SDS_STOP_CMD);
}
// --------------------------------------------------------
// SDS011:wakeup
// --------------------------------------------------------
void SDS011::wakeup() {
SDS_cmd(SDS_START_CMD);
}
// --------------------------------------------------------
// SDS011:continous mode
// --------------------------------------------------------
void SDS011::contmode(int noOfMinutes)
{
byte buffer[SDS_cmd_len];
memcpy(buffer, SDS_CONT_MODE, SDS_cmd_len);
buffer[4] = (byte) noOfMinutes;
buffer[17] = calcChecksum( buffer );
for (uint8_t i = 0; i < SDS_cmd_len; i++) {
sds_data->write(buffer[i]);
}
sds_data->flush();
while (sds_data->available() > 0) {
sds_data->read();
}
// SDS_cmd(SDS_CONTINUOUS_MODE_CMD);
}
/*****************************************************************
* send SDS011 command (start, stop, continuous mode, version *
*****************************************************************/
void SDS011::SDS_cmd(const uint8_t cmd)
{
byte buf[SDS_cmd_len];
switch (cmd) {
case SDS_START_CMD:
memcpy(buf, SDS_START, SDS_cmd_len);
break;
case SDS_STOP_CMD:
memcpy(buf, SDS_SLEEP, SDS_cmd_len);
break;
case SDS_CONTINUOUS_MODE_CMD:
memcpy(buf, SDS_CONT_MODE, SDS_cmd_len);
break;
case SDS_VERSION_DATE_CMD:
memcpy(buf, SDS_VERSION, SDS_cmd_len);
break;
default:
return;
}
for (uint8_t i = 0; i < SDS_cmd_len; i++) {
sds_data->write(buf[i]);
}
sds_data->flush();
while (sds_data->available() > 0) {
sds_data->read();
}
}
// --------------------------------------------------------
// SDS011: calculate checksum
// --------------------------------------------------------
uint8_t SDS011::calcChecksum( byte *buffer )
{
uint8_t value = 0;
for (uint8_t i = 2; i < 17; i++ )
{
value += buffer[i];
value &= 0xff;
}
return value;
}
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;
}
void SDS011::begin(HardwareSerial* serial) {
Serial.println("SDS011::begin");
// serial->begin(9600); // why do I have to remove this line?
sds_data = serial;
}
void SDS011::begin(SoftwareSerial* serial) {
serial->begin(9600);
sds_data = serial;
}