The X9C103S is a 10k variable digital potentiometer module whose resistance value can be changed using an MCU. It consists of a 3-pin output that can replace a mechanical potentiometer which has 3 pins. This module has 99 resistance components and the final resistor is controlled by a 3-wire interface.

Specifications:

Supply voltage: 3V-5V
Chip: X9C103S
PCB board size: 2.7 * 1.3CM
10K span potentiometer.
VL and VH digital potentiometer sliding rheostat port corresponding to the low-end and high-end, allowing the input voltage range -5V to + 5V.

 X9C103S Module Pinout

• VCC: Module power supply – 5V
• CS: Chip Select. Active LOW
• INC: Changing resistor command
• U/D: UP / Down. Adjusting resistor
• GND: Ground
• VL: Voltage Low
• VW: Voltage Wiper is the voltage output of the adjustable wiper contact
• VH: Voltage High

#include 

DigiPot pot(2,3,4);

void setup() {
  Serial.begin(9600);
}

void loop() {
  Serial.println("Starting");  

  for (int i=0; i<100; i++) {
    pot.increase(1);
    Serial.println(analogRead(A0));
    delay(20);
  }
  
  
  for (int i=0; i<100; i++) {
    pot.decrease(1);
    Serial.println(analogRead(A0));
    delay(20);
  }

}