0503-09 MCP3208 ADC

Example Projects > 0503 Generic SPI Communication > 0503-09 MCP3208 ADC

Reading MCP3208 ADC via SPI bus

This folder contains the source files for reading ADC data from the MCP3208 12-bit ADC via SPI bus, which is available e.g. on the Raspberry Pi minicomputer. The example is based on the REXLANG user-programmable function block.

The 12-bit data obtained from the ADC chip can be further converted to physical units using e.g. the LIN function block.

Timing of the project

The algorithm runs each 100 milliseconds (0.1 s). See the EXEC function block,
tick x ntick0 = 0.01 x 10 = 0.1


  • RexCore must be installed and running on the target device (Raspberry Pi).
  • SPI bus must be enabled and available (e.g. /dev/spidev0.0 on the Raspberry Pi)
  • The wiring must comply with the attached datasheet.

Running the example

  • The *exec.mdl file is the project main file.
  • Open it with RexDraw.
  • Specify the SPI bus by the "p0" parameter of the REXLANG function block.
  • Compile and download the project to the target device.
  • Switch to Watch mode and observe the algorithm in real-time.
  • Apply external voltage to the ADC input pins and observe the received data.


Additional information

  • Raspberry Pi is a trademark of the Raspberry Pi Foundation.
  • Visit the REXYGEN webpage for more information about the example projects and developing advanced automation and control solutions using REXYGEN.