Hi,
We're trying to replicate a project we've found on the web - https://spin.atomicobject.com/2014/10/12/raspberry-pi-current-power-meter/ which uses an ADC Pi and an ADC Differential Pi. How do these boards connect to each other, and to external voltages?
Many thanks,
Jon
How to connect ADC Pi and ADC Differential Pi
963 Views - Created 14/07/2020
14/07/2020
Posted by:
jevers99
14/07/2020
Posted by:
andrew
Location:
United Kingdom
Hi Jon
If you use the same circuit diagram shown on the website you linked to you would use the ADC Pi for the top ADC with the IN pin connected to one of the input channels and the ADC Differential Pi for the lower ADC with the IN+ connected to + input and the IN- connected to the - input.
The SDA, SCL, VDD and VSS pins shown on the diagram for each ADC would be connected through the Raspberry Pi GPIO header when you stack the ADC boards on top of the Raspberry Pi.
You will need to make sure the Vdd voltage connected to the shunt resistor does not exceed 5V and the voltage across the shunt resistor does not exceed 2.048V.
If you use the same circuit diagram shown on the website you linked to you would use the ADC Pi for the top ADC with the IN pin connected to one of the input channels and the ADC Differential Pi for the lower ADC with the IN+ connected to + input and the IN- connected to the - input.
The SDA, SCL, VDD and VSS pins shown on the diagram for each ADC would be connected through the Raspberry Pi GPIO header when you stack the ADC boards on top of the Raspberry Pi.
You will need to make sure the Vdd voltage connected to the shunt resistor does not exceed 5V and the voltage across the shunt resistor does not exceed 2.048V.
15/07/2020
Posted by:
jevers99
Apologies for so many questions. I've seen other boards with IN+ etc marked on them, what is the equivalent on the ADC Differential Pi board?
15/07/2020
Posted by:
andrew
Location:
United Kingdom
The IN+ pins are the inner row of input pins with a + on the end. The IN- pins are the middle row with a - on the end.
The image below should explain it better.
The image below should explain it better.
15/07/2020
Posted by:
jevers99
That is fantastic, thank you
Note: documents in Portable Document Format (PDF) require Adobe Acrobat Reader 5.0 or higher to view, download Adobe Acrobat Reader or other PDF reading software for your computer or mobile device.