Hello, I am currently working on a project in which I plan to use the "Dust Sensor SDS011" to read the fine dust value pm 2.5 and pm 10 and then store it on the "Data Logger Shield V 1.0". Both are connected to an "Arduino UNO".
At the beginning, I tested the storage on the SD card using the sample code "Datalogger", with which everything worked.
/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card using the SD library.
The circuit:
analog sensors on analog ins 0, 1, and 2
SD card attached to SPI bus as follows:
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
This example code is in the public domain.
*/
#include <SPI.h>
#include <SD.h>
const int chipSelect = 10;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1);
}
Serial.println("card initialized.");
}
void loop() {
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}
I then tested the operation of the sensor using the sample code "quickstart" and this also worked fine.
#include "SdsDustSensor.h"
int rxPin = 0;
int txPin = 1;
SdsDustSensor sds(rxPin, txPin);
void setup() {
Serial.begin(9600);
sds.begin();
Serial.println(sds.queryFirmwareVersion().toString()); // prints firmware version
Serial.println(sds.setActiveReportingMode().toString()); // ensures sensor is in 'active' reporting mode
Serial.println(sds.setContinuousWorkingPeriod().toString()); // ensures sensor has continuous working period - default but not recommended
}
void loop() {
PmResult pm = sds.readPm();
if (pm.isOk()) {
Serial.print("PM2.5 = ");
Serial.print(pm.pm25);
Serial.print(", PM10 = ");
Serial.println(pm.pm10);
// if you want to just print the measured values, you can use toString() method as well
Serial.println(pm.toString());
} else {
// notice that loop delay is set to 0.5s and some reads are not available
Serial.print("Could not read values from sensor, reason: ");
Serial.println(pm.statusToString());
}
delay(500);
}
I also made sure in both tests that I had chosen the correct USB port, downloaded the libraries and selected the correct pins. Nevertheless, the code I combined did not work at all. Already, after inserting the "SdsDustSensor.h" library from the second example program into the first one, the serial monitor gave only strange characters. I tested if this problem would improve after the complete combination, but now I only get mirrored question marks on the serial monitor. I also set the 9600 baud rate I implemented in the serial monitor. Below, you can see my current code and a photo of the circuit:
#include <SPI.h>
#include <SD.h>
#include <SdsDustSensor.h>
const int chipSelect = 10;
int rxPin = 6;
int txPin = 7;
SdsDustSensor sds(rxPin, txPin);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
while (1);
}
Serial.println("card initialized.");
sds.begin();
Serial.println(sds.queryFirmwareVersion().toString()); // prints firmware version
Serial.println(sds.setActiveReportingMode().toString()); // ensures sensor is in 'active' reporting mode
Serial.println(sds.setContinuousWorkingPeriod().toString()); // ensures sensor has continuous working period - default but not recommended
}
void loop() {
// make a string for assembling the data to log:
String dataString = "";
PmResult pm = sds.readPm();
if (pm.isOk()) {
dataString += "PM2.5 = ";
dataString += pm.pm25;
dataString += ", PM10 = ";
dataString += pm.pm10;
}
else {
// notice that loop delay is set to 0.5s and some reads are not available
Serial.print("Could not read values from sensor, reason: ");
Serial.println(pm.statusToString());
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
delay(500);
}
I hope you can help me find and solve the problem, thanks!
