From 4edff01a37667e39b17e2db05ec22e3d1a74e9eb Mon Sep 17 00:00:00 2001 From: August Quint <49277349+AugustQu@users.noreply.github.com> Date: Tue, 21 Jan 2020 14:51:41 +0100 Subject: [PATCH] initial --- lib/SDS011/src/SDS011.cpp | 191 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 191 insertions(+) create mode 100644 lib/SDS011/src/SDS011.cpp diff --git a/lib/SDS011/src/SDS011.cpp b/lib/SDS011/src/SDS011.cpp new file mode 100644 index 00000000..31efdea4 --- /dev/null +++ b/lib/SDS011/src/SDS011.cpp @@ -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; +}