sleep() does not stop fan

[coelner]

I use a PMS7003 and the sleep command does not stop the fan. If I short the SET pin to GND the fan stops.

[fu-hsi]

I think that sleep() is not the problem, but communication with (to) PMS, and none commands works, I am right?
Just check wiring, baud rate and so on.
Depending on the module, it is not advisable to use TX/RX lines that are shared with USB (for programming).
For better understand your problem, more information is required:

• module,
• circuit,
• code.

[coelner]

#include <SoftwareSerial.h>
#include "PMS.h"

SoftwareSerial SerialPMS = SoftwareSerial(D1,D2);
PMS pms(SerialPMS);
PMS::DATA data;

void setup()
{
  Serial.begin(115200);   // GPIO1, GPIO3 (TX/RX pin on ESP-12E Development Board)
  SerialPMS.begin(9600);  // GPIO2 (D4 pin on ESP-12E Development Board)
  pms.passiveMode();    // Switch to passive mode
}

void loop()
{
  Serial.println("Waking up, wait 30 seconds for stable readings...");
  pms.wakeUp();
  delay(30000);

  Serial.println("Send read request...");
  pms.requestRead();

  Serial.println("Wait max. 1 second for read...");
  if (pms.readUntil(data))
  {
    Serial.print("PM 1.0 (ug/m3): ");
    Serial.println(data.PM_AE_UG_1_0);

    Serial.print("PM 2.5 (ug/m3): ");
    Serial.println(data.PM_AE_UG_2_5);

    Serial.print("PM 10.0 (ug/m3): ");
    Serial.println(data.PM_AE_UG_10_0);
  }
  else
  {
    Serial.println("No data.");
  }

  Serial.println("Going to sleep for 60 seconds.");
  pms.sleep();
  delay(60000);
}

I choosed the Advanced.ino and changed it to use Softwareserial. The PMS7003 uart module is connected via Pins D1 and D2 at a wemos D1 Mini.
This is the used one: https://i.ebayimg.com/images/g/tr0AAOSwNDhb0t5k/s-l500.jpg

So, getting the values works fine.

[fu-hsi]

You forgot to set the baud rate.

I do not think it is correct:
SerialPMS.begin(D1,D2); // GPIO2 (D4 pin on ESP-12E Development Board)

begin() require speed parameter, not pin numbers:
https://github.com/arduino-org/Arduino/blob/master/hardware/arduino/samd/libraries/SoftwareSerial/SoftwareSerial.h

Read this:
https://www.arduino.cc/en/Reference/SoftwareSerialBegin

And set proper baud rate to 9600 (PMS::BAUD_RATE).

[coelner]

Sorry, I fixed the sketch. ( I removed sketch and library to test others. Therefore I had to rewrite the sketch)

[fu-hsi]

If still does't work, I recommend use another library which implement Serial functionality, like:

• AltSoftSerial,
• NeoSWSerial.

[coelner]

Ok, I have no time to test those libraries. Instead I use the original sketch with hardware serial. Even this does not stop the fan. The measuring and reporting works, at least I get values.

[coelner]

Both libraries doesn't work with the esp8266.
I tried again the original sketch which works. I'm currently on the latest trunk.
SoftwareSerial does not work, but the sleep command is send.

[fu-hsi]

After:
pms.sleep();
You can add:
SerialPMS.flush();

If it doesn't help, you can always use dedicated PMS pin:

SET - Standby function, when pulled down the module does not send information over serial and goes into a low power state.

[coelner]

I could use those separate pins but it should be possible even with the softwareserial library. It is not very special at all, therefore must be somehow a solution.

I sniffed the traffic:

ssterm -b 9600 -o split /dev/ttyUSB0
42 4d e4 00 01 01 74 42  4d e2 00 00 01 71 40 4d  |BM....tBM....q@M|
e4 00 00 01 73 42 4d e4  00 01 01 74 42 9a e2 00  |....sBM....tB...|
00 01 71 40 4d e4 00 00  01 73                    |..q@M....s      |

• wakeUp
• requestRead
• Sleep [but wrong leading '40']
• WakeUp
• Garbage [42 9a e2 00 00 01 71]
• Sleep [but wrong leading '40']

[coelner]

I tried the espsoftwareserial

$ssterm -b 9600 -o split --rx-nl crlf /dev/ttyUSB0
42 4d e1 00 00 01 70 42  4d e4 00 01 01 74 42 4d  |BM....pBM....tBM|
e2 00 00 01 71 42 4d e4  00 00 01 73 00 00 42 4d  |....qBM....s..BM|
e1 00 00 01 70 42 4d e4  00 01 01 74 42 4d e2 00  |....pBM....tBM..|
00 01 71 42 4d e4 00 00  01 73 

• passiveMode
• WakeUp
• requestRead
• sleep
• 00 00
• passiveMode
• wakeUp
• requestRead
• sleep
  It works with the sleep. Do you fill a issue at esp8266 git?

[fu-hsi]

So now everything works? That's good.

I don't remember If I tested library with software serial implementation.
I use Hardware Serial always when possible.

My Station is online now and I can't modify it:
https://github.com/fu-hsi/AQMS

As I suggested, read this: #5 and replace all instances:

_stream->write(command, sizeof(command));

with

_stream->write(command, sizeof(command));
_stream->flush();

just in case. This command wait for transmit all bytes.

[coelner]

I will test it. But somehow the commands were changed if I used the native library.
I close the issue because it is not in your library.