Arduino Tutorial

Requirements



Hardware



DFRduino UNO R3 (or similar) x 1



DFRobot Gravity: 12-Bit I2C DAC Module x 1



Gravity 4P sensor wire (or Dupont wires) x 1



Digital multimeter (optional) x 1



Oscilloscope (optional) x 1



Software



Arduino IDE (V1.0.x or V1.8.x), Click to Download Arduino IDE from Arduino®



Download and install the MCP4725 Library. How to install the library?

Connection Diagram

Calibration and adjustable analog voltage output

Although the DAC's voltage output accuracy is affected by several factors that cause the actual

output voltage to deviate from the user-specified voltage values, the DAC reference voltage, Vref, of

the MCP4725 is the same as the supply voltage VCC, and the supply voltage is usually not accurate

(the actual voltage is not exactly 5.000 V or 3.300V), which results in large output error. Here, we

provide a simple calibration method to eliminate the error caused by the inaccurate reference

voltage. If calibration is not carried out, users can still simply set REF_VOLTAGE to 5000 in the

code below (for a 5V controller such as an Arduino) or 3300 (for a 3.3V controller such as Raspberry

Pi, FireBeetle) depending on the controller used.