The first 4 bits are control bits and the remaining are bits which will contain the value you want to send. A sketch test which can be uploaded to test our DAC + DUE connections is (you can copy it and paste directly in the Arduino IDE for a better readability): /* DAC _MCP4922 to DUE This sketch allows you to interface the Arduino DUE with a DAC MCP4922. The multimeter will be connected with one end to the GND of the Arduino and the other one to the OUT_A of the previous picture. Of course this will work only if the frequency of the signal we want to generate is less than the maximum frequency we can observe with the multimeter. So to let the DAC MCP4922 Digital Analog Converter work with the Arduino DUE the following connections can be made: ARDUINO DUE Pin 10 Pin 7 (Optional): It is used only if you want to have the possibility to shut down the DAC SCK (from the SPI pins in the middle of the DUE board) MOSI (from the SPI pins in the middle of the DUE board) MCP4922 Pin 3: CS Pin 9: SHDN Pin 4: SCK Pin 5: SDI (Serial Data In)ģ The other pins of the DAC are connected according to the following picture: To test if the sketch that we will upload it is working we can use a digital multimeter. In the following picture is displayed a scheme of the pins of the DAC MCP4922. The following table display on which pins the SPI lines are broken out on the different Arduino boards:Ģ Arduino Board MOSI MISO SCK Uno or Duemilanove Mega1280 or Mega or ICSP-4 51 or ICSP-4 12 or ICSP-1 50 or ICSP-1 13 or ICSP-3 52 or ICSP-3 SS (slave) SS (master) Leonardo ICSP-4 ICSP-1 ICSP Due ICSP-4 ICSP-1 ICSP-3-4, 10, 52 Note that MISO, MOSI, and SCK are available in a consistent physical location on the ICSP header this is useful, for example, in designing a shield that works on every board. The other SPI pins are available in middle of the board as shown in the following picture. On the DUE the pins (CS) with which it is possible to address SPI devices are: 10, 4, 52 (See picture below). ![]() ![]() Some libraries allows the user also to specify the CS pin at the beginning. The most of the libraries are using the pin 10 as CS pin but that is up to software developer. The big difference between and Arduino DUE and other Arduinos about SPI is that with the DUE is possible to address up to 3 different SPI devices at the same time, instead on the Arduino UNO for you can address just one SPI device at a time. 1 Arduino DUE + DAC MCP4922 (SPI) v101 In this document it will described how to connect and let a Digital/Analog convert work with an Arduino DUE.
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