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AQMll max cabling distances
#1
HI

Just received all the goodies I ordered  Thanks !

I am having difficulty in deciding the location of the SDS011 sensor  wrt the AQM11 pcb.

The SDS011 uses serial comms, however it is only +5 to 0V,  not +- V as per standard.

Please can anyone tell me the maximum advisable distance between the ESP8266 and the SDS011, with reliable communication.  Practical experience would be useful!
I would like to be able to choose a location for the sensor and AQMll and make off the correct length of cable with plugs and sockets and not have to do it twice!

many thanks

Patrick
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#2
Hello Patrick,

My experience always says to make cables as short as possible. In this case, it would mean a maximum of about 1/4 meter.
But I don't know the exact answer to your question...

An example of this is the image of my oldest version of AQM:

[Image: DSC_7444-upr-sm.jpg]

Or a picture of a 3D print on our WiKi (but Jarek has not yet published a program):

   

That means: all in one box.
Best Regards
Zdenek

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#3
Hi Patrick,

As Zdenek said, the shorter the cable the better. I would nor go for longer than 25 cm.

Let me give some hints:
- Install everything on the same box.
- The air intake on the SDS011 sensor is on the back. There is an adapter for a tube. If you wish, you can attach a small plastic tube and extend it to outside of the box (take care for water not get in).

[Image: sds011-large.png]

- Connect sensor this way:
AQMII  --  SDS011

SET ->    RXD
TX   ->    TXD
GND ->    GND
5V   ->    5V
MeteoCercal - Air Quality Data
Click here to watch at my ThingSpeak channel



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