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raspberry:dac_mcp4802-22 [2020/10/09 16:34]
admin [Digital Analog Converter - MCP4802 MCP4822] 		raspberry:dac_mcp4802-22 [2020/10/16 21:53]
admin
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 ===== Digital Analog Converter - MCP4802/22 ===== ===== Digital Analog Converter - MCP4802/22 =====
 +
 +The MCP4802 is a dual 8-Bit Digital Analog Converter with SPI interface. The MCP4822 is the 12-Bit version.\\
  
 [[http://ww1.microchip.com/downloads/en/devicedoc/20002249b.pdf|MCP4802/22 datasheet]] [[http://ww1.microchip.com/downloads/en/devicedoc/20002249b.pdf|MCP4802/22 datasheet]]
 +
 +----
 +=== WiringPi and the MCP 4802 ===
 +To connect the MCP 4802  to the Raspberry Pi connect the SPI pins of the MCP4802 like that:\\
 +
 +{{:raspberry:mcp4802_pinout.jpg?200|}}\\
 +
 +   MCP4802       Raspberry Pi
 +   
 +    Vdd           5V
 +    CS            CE1
 +    SCLK          SCLK
 +    SDI           MOSI
 +    Vss           GND
 +    LDAC          GND
 +
 +{{:puredata:gpio-pinout-diagram-2.png?400|}}\\
 +
 +Before using the Wiring object enable the SPI interface in:
 +   $ sudo raspi-config
 +
 +----
 +==== with Commandline ====
 +
 +[[https://swharden.com/blog/2016-09-28-generating-analog-voltages-with-the-raspberry-pi/]]\\
 +
 +to output some voltage:
 +  $ echo -ne "\x1F\xFF" > /dev/spidev0.1
 +
 +----
 +==== with BCM2835 Library ====
 +[[https://www.airspayce.com/mikem/bcm2835/]]\\
 +[[https://www.youtube.com/watch?v=0QcteUtzB4o]]\\
 +
 +
 +----
 +==== with WiringPi ====
 +
 +   #include <wiringPiSPI.h>
 +
 +[[http://wiringpi.com/reference/spi-library/]]\\
 +[[https://projects.drogon.net/raspberry-pi/wiringpi/spi-library/]]\\
 +[[https://projects.drogon.net/raspberry-pi/gertboard/analog-inout/]]\\
 +[[https://projects.drogon.net/understanding-spi-on-the-raspberry-pi/]]\\
 +
 +[[https://www.petervis.com/Raspberry_PI/Gertboard_Raspberry_Pi_Expansion/Gertboard_Digital_to_Analog_Converter.html]]\\
 +[[https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial/all]]\\
  
  
 ---- ----
 ==== Links ==== ==== Links ====
 +
 +
 +[[https://engineer.john-whittington.co.uk/2015/03/raspberry-pi-dac-mcp4725-with-wiringpi/]]\\
 +[[https://skpang.co.uk/blog/archives/689]]\\
 +[[http://www.netzmafia.de/skripten/hardware/RasPi/RasPi_SPI.html]]\\
 +
  
  
  
 ---- ----