rohan chopra

#include "Wire.h"
#include "SPI.h"
#include "Adafruit_MCP4725.h" // DAC library
#include "Adafruit_INA219.h" // INA219 current sensor library
// Declare a current sensor object.
Adafruit_INA219 ina219; // Commands like ina219.getCurrent_mA() will read the current.
// Declare our voltage supply objects.
Adafruit_MCP4725 dac_v_ds;
//HERE DECLARE A SECOND DAC OBJECT TO BE USED TO SET GATE VOLTAGE (e.g. DAC_V_G)
Adafruit_MCP4725 dac_v_g ;
//
#define DAC_RESOLUTION (9) // Set this value to 9, 8, 7, 6 or 5 to adjust the resolution.
void setup() {
// Initiates serial communication, so we can send our data to our computer.
Serial.begin(9600);
// Initialize the INA219 sensor (current sensor).
ina219.begin();
// Initialize our DAC breakout boards.
dac_v_ds.begin(0x62); // 0x62 sets the hex address of dac_v
//HERE ADD A SECOND DAC FOR GATE VOLTAGE, WITH ADDRESS 0x63
dac_v_g.begin(0x63);
//
}
void loop() {
// Set a voltage to the MOSFET Gate and sweep DAC_VDS Voltage to the Drain/Source pins,
// read corresponding Voltage and Current across the MOSFET at VDS each step.
//HERE SET YOUR GATE VOLTAGE DAC TO 5V VIA .setVoltage() FUNCTION CALL
dac_v_g.setVoltage(5.0*4095/5.0,false);
//
//HERE MEASURE THE GATE VOLTAGE USING analogRead(0) FUNCTION (READS VOLTAGE AT PIN A0)
//AND PRINT MEASURED GATE VOLTAGE TO SERIAL TERMINAL.
Serial.println(analogRead(0));
//
//
// Print table headers to serial port.
Serial.print("Volts DS");
Serial.print(" ");
Serial.println("I_FET");
// Sweep dac_v from 0 to 5V (approximately… may be lower due to BJT stage).
for (int i = 0; i < 4096; i += 20) {
dac_v_ds.setVoltage(i, false);
delay(5); // Delay for 5ms to stabilize circuit.
// Read VDS and ID at/across MOSFET.
Serial.print(ina219.getBusVoltage_V()); // Reads voltage V at MOSFET Drain/Source.
Serial.print(" ");
Serial.println(ina219.getCurrent_mA()); // Reads current I through MOSFET.
// To prevent overheating from excessive current we shut down V for a few ms.
// We are effectively pulsing the MOSFET to ensure we don’t exceed
// maximum power dissipation (P_max) rating.
dac_v_ds.setVoltage(0, false); // Set VDS to 0V to allow cooling.
delay(50); // Delay 10ms to allow MOSFET to cool.
}
// Uncomment delay() below if you prefer your program to stop for a time after an IV collection.
//delay(300000);
}