Image result for Raspberry PI Interfacing Multiple Analog Inputs It includes eight analog inputs that the Pi may access via four digital pins. That makes it a perfect addition to the Pi for integrating simple sensors like photocells, FSRs or potentiometers, thermistors, etc.
Learn how to connect analogue sensors to the Raspberry Pi by following this Tutorial:
Insert the Pi Breakout Board.
Place the MCP3008 in the socket.
Make a 3V3 power supply.
Create a ground rail
Increase the length of your Power Rail.
Increase the length of your ground rail.
Connect VDD to the Power Rail.
Because the GPIO inputs are all digital, you'll need to build an ADC circuit with numerous GPIO pins or use a sound card to conduct analogue sampling, depending on your needs.
The Raspberry Pi has no analog static RAM inputs, but it does have 512 MB to 4 GB of RAM, USB, camera, display, audio, and video interfaces, and it runs on a micro SD card.
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