This blog is a presentation covering two things.
First 10 minutes, I talk about a problem with the resistance of the USB power leads, which may be strangling your Pi.
Then I go on to a specific use case where I use the MCP3008 to monitor battery voltage and current for the purpose of monitoring a Sealed Lead Acid (SLA) backup battery, which is providing a backup power supply for a Pi project.
My previous blog entry is a presentation about the MCP3008 Analogue to Digital Converter on Raspberry Pi, and you might want to check that out first if you want a deep dive into the MCP3008. In the presentation below, I describe how to use the MCP3008's differential mode (something I somewhat dismissed in the previous presentation), and how it can operate slightly outside the power supply of the chip, which is particularly useful for current monitoring.
This is a presentation I gave at Raspberry Pint in London on 29th January 2019.
I would like to thank CodeNode for making the video available.
