analog to digital converter for raspberry pi

Here are the electronic parts needed for this circuit: Now that we understand how an AD/DA Converter works, we can utilize it in this Raspberry Pi Potentiometer Tutorial to read the analog values from the potentiometer. We can easily compute the analog value of a digital quantity through this formula:ĭigital Quantity / Resolution * (Supply Voltage or VDD) = Analog Value Setting Up Our Raspberry Pi Potentiometer Tutorial Circuit

This means it can convert the supply voltage (VDD) by 256 (2^8) parts. The same AD/DA Converter, PCF8591, also has a DAC output pin with an accuracy of 8-bits. On the other hand, a Digital-to-Analog (DA) Converter is basically the opposite of ADC. Therefore, the higher the resolution the ADC converter supports, the more precise the conversion will be. So, if the ADC converter reads an analog voltage of 1.65V, the converted digital value is 128.

We can easily compute the digital quantity which correspond to the analog value read by the ADC module through this formula:Īnalog Value / (Supply Voltage or VDD) * Resolution = Digital Quantity The analog value read by the ADC module will be represented by a value between 0 – 255 (digital quantity). For example, the AD/DA Converter, PCF8591, which we will be using in this tutorial, supports 8 bits thus, it has a resolution of 256 (or 2^8). The precision of an Analog-to-Digital (AD) Converter to convert an analog signal to digital signal is measured by its range or number of supported bits. What is an AD/DA Converter?Īn AD (Analog to Digital) / DA (Digital to Analog) Converter is an electronic device/module that can convert an analog signal to a digital signal and vice versa. However, in this Raspberry Pi Potentiometer Tutorial, we will be utilizing an AD/DA Converter to allow our microprocessor to work with analog signals. Although PWM is not a real analog signal, it is the only means a digital device like the Raspberry Pi can directly deliver varying power to a load. Previously, we were able to utilize the Raspberry Pi’s PWM Channel to control an RGB LED to display different colors. This will all be possible by interfacing the Raspberry Pi with an AD/DA module that converts the analog value from the potentiometer to a digital value, which is readable by the Raspberry Pi’s GPIO pins. In this Raspberry Pi Potentiometer Tutorial, learn how to connect potentiometer to Raspberry Pi and how to read the potentiometer output using the Raspberry Pi’s GPIO.

Analog to digital converter for raspberry pi