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Old engineer question/confusion

1389 Views - Created 06/12/2015

06/12/2015

Posted by:
Bradshawlupton

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Pi b+ code and device is beautiful.

Put in the three rows of headers.

shouldnt an AAA battery from GND to + show the 1.2v?  It shows 0

 

      On. - / +. Differential it shows 5 v, as expected.  

 

       Certainly confused engineer syndrome.   Thanks. Beautiful professional bargain device!

06/12/2015

Posted by:
andrew

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Location:
United Kingdom

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Hi

To measure between ground and + you will also need to connect the - to ground.  This puts the ADC channel into single ended mode which allows you to measure between 0 and + 2.048V.  

When the - is not connected to ground the ADC channel will be in differential mode which allows you to measure between -2.048V and + 2.048V but you have to put the inputs between the + and - instead of + and GND.

AB Electronics UK Tech Support

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