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Some examples of these might be a function generator, the output of a potentiometer, or the voltage level of a battery. The Raspberry Pi is an amazing piece of hardware. It, along with the Arduino, are the de facto standard development boards used among the maker community.
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The Raspberry Pi can do a lot of things that are not possible on the Arduino, but there is one popular feature that is available on the Arduino that the Raspberry Pi does not have, that is analog inputs. However, we can add this capability to the Raspberry Pi by interfacing an external analog-to-digital converter (ADC) chip.Īn ADC is an electronic component that converts analog voltage signals into digital values. These values can then be read by the host system. In this tutorial, we will use a stand-alone ADC integrated circuit, the MCP3008 by Microchip, and interface it to the Raspberry Pi via the SPI bus. The MCP3008 is an 8-channel 10-bit ADC, meaning it provides 8 individual analog inputs at 10-bit resolution. It also has the capability of running in a pseudo-differential mode where the single-ended inputs can be paired together to provide differential inputs, the voltage difference of the pairs. We will use both the single-ended and pseudo-differential modes in this tutorial. My development board is the Raspberry Pi 3 Model B running the Raspberry Pi OS operating system. I am also using an optional GPIO breakout board to make the wiring between the Raspberry Pi and the breadboard a little easier. If you are using a different Raspberry Pi model or a different OS that is similar to Raspberry Pi OS, the vast majority of this tutorial should still apply, however, some minor changes may be necessary.
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If you need assistance with your particular setup, post a question in the comments section below and I, or someone else, can try to help you. #Analog to digital converter raspberry pi how to#īuilding The Circuitīefore connecting any circuitry to your Raspberry Pi, shutdown and disconnect it from power.