[Pysense] How can I connect a sensor to the external IO Header

[pierrot10]

@jclo13 Hello,
I am on a good way, but I postponed that project due to other emergency tasks. I planned to be back with Pycom in a couple of weeks. I will update you.

[pierrot10]

@seb Dear Seb,
But would it possible or recommended to solder header on the side of the LoPy?

[jmarcelino]

@pierrot10
I’m afraid Seb has left Pycom but I’ll answer.

Soldering a header to the side could work but not very mechanically stable. If it breaks it may take some of the pads.

I would recommend a female long pin stacking header for your application

[DDA]

@pierrot10
I see a problem with the schematics above, when reading multiple WM sensors the ground paths should be isolated:

“
Sensors must be powered individually, and the ground must be isolated from sensor to sensor. Even if powered individually, an open ground path to another un-powered sensor can't be allowed. This is best accomplished using multiplexers to open and close the appropriate channels.
“
For additional details please refer to :
www.irrometer.com/200ss.html

[sslupsky]

Hi @pierrot10 The internal ADC has very poor performance. The non linearity is poor and it has a high noise floor. I think someone earlier suggested using an external ADC and I think that is very good advice.