Analog to Digital Converter

Piunora has an on-board analog to digital converter (ADC) so you can read analog voltages in f.e. Python (see the Getting to Blinky guide) and other programming languages. It is connected via a dedicated SPI bus.

The ADC is a MCP3008 and is connected to the CM in the following way:

• SPI bus #5
• MOSI/DIN: GPIO14
• MISO/DOUT: GPIO13
• SCLK/CLK: GPIO15
• CS/SHDN: GPIO24

You can use the Blinka/Python example we provide (see Getting to Blinky guide) or use a different programming language. There are drivers for:

• C/C++ (untested, you should probably talk to the Linux universal SPI driver instead)
• JavaScript
• Go
• Rust (depends on rpi_embedded)

You can also use the built-in Linux IIO driver to use the ADC from within Kernel features. https://github.com/torvalds/linux/blob/master/drivers/iio/adc/mcp320x.c

There are also many more options our there that are not covered here.