I just revise LIFA code for MCP 4822 following this post.I will test it tomorrow morning in the morning. Now I just post it out and I am not sure whether it is correct or not.Someone has already created MCP 4822 arduino library which is pretty good. You can download it from here. The Example code is as below#include <SPI.h>#include "mcp4822.h"#define AOUT_CS A1#define AOUT_LDAC A3MCP4822 analogOut = MCP4822(AOUT_CS,AOUT_LDAC);void setup() { // Setup serial and SPI communications Serial.begin(115200); analogOut.begin(); SPI.setDataMode(SPI_MODE0); SPI.setBitOrder(MSBFIRST); SPI.setClockDivider(SPI_CLOCK_DIV8); SPI.begin(); // Configure analog outputs analogOut.setGain2X_AB();}void loop() { static int cnt=0; analogOut.setValue_A(cnt); cnt += 20; if (cnt > 4095) { cnt = 0; }}The example is straightforward. I could get an output voltage from DACa through setValue_A method. So, I would like to create a VI with one parameter which is voltage(0-4095).1. Revise LabVIEW baseI added serveral code:// Variablesunsigned int retVal;int sevenSegmentPins[8];int currentMode;unsigned int freq;unsigned long duration;int i2cReadTimeouts = 0;char spiBytesToSend = 0;char spiBytesSent = 0;char spiCSPin = 0;char spiWordSize = 0;Servo *servos;byte customChar[8];LiquidCrystal lcd(0,0,0,0,0,0,0);MCP4822 analogOut(A3,A0);Create on MCP4822 object first. A3 is CS pin, A0 is LDAC pincase 0x2E: // MCP4822 support analogOut.setGain2X_AB(); analogOut.setValue_A(command[2]); break;I added serveral line here as Example does. command[2] is the set voltage.And then，I create a new VI:The number for MCP4822Write is 46, which equals to 0x2E.I am not sure this is correct, so please help me if you find something wrong with it. Thank You!

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Are the cases getting called correctly? To test this I would make the LED blink or something to know that the function is getting called correctly.

Also, I can't tell you if your code is correct without the full code. Attach the file.

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