When you turn an LED on via a digital output, you are simply sending a HIGH signal to that output at whatever voltage the chip operates on (3.3V and 5V being standard logic level voltages).Īn Analogue signal however is completely different. In the digital age that we live in, the world ‘analogue’ is often avoided like the plague, however you’ll find that the ability to output analogue voltages is vital for many computing applications. But first let’s clarify exactly what we mean when referring to ‘digital’ and ‘analogue’.ĭigital communication consists of nothing more than binary data.
In this tutorial, we'll look at creating a DAC (Digital-Analog-Converter). The Raspberry Pi 3 builds on this with some amazing new features, however one feature that is still absent is the ability to output a true analogue voltage from the GPIO pins. Raspberry Pi right? It’s amazing! Raspberry Pi has taken the world by storm and changed the way that people think about computing.
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