Digital Potentiometer Module X9C103S 10K for Arduino Raspberry

Specifications:

• Operating Voltage: 3.3V - 5V DC 
• Maximum Resistance: 10kΩ
• Minimum Resistance (Wiper): 40Ω
• Number of Taps (Steps): 100
• Control Interface: 3-Wire Digital (CS, U/D, INC)
• Compatible Platforms: Arduino, Raspberry Pi, ESP32, STM32
• Dimensions: 27mm × 13mm

Applications

• Electronic volume control in low-power audio amplifiers
• Adjustable voltage divider for sensor calibration in data acquisition
• LED brightness modulation in lighting and display circuits
• Fine-tuning gain or offset in analog signal processing
• Servo or motor trim adjustment in robotics applications
• Prototyping variable resistance loads for testing power supplies

Features

• 10K span potentiometer.
• Potentiometer centers tap between the 0-10k slide in total 100 (potentiometer wiper typical impedance 40 ohms)
• VL and VH digital potentiometer sliding rheostat port corresponding to the low-end and high-end, allowing the input voltage range 3.3V to + 5V.

Unlock New Capabilities

• Past Projects: If you've already experimented with standard rotary potentiometers to manually adjust the contrast of a 16x2 LCD display, tune a 555 timer circuit, or set a threshold voltage for an operational amplifier, you know that physical knobs require constant human intervention. They also drift over time due to vibration and wear.
• Feature Upgrade: This X9C103S module unlocks fully automated, software-driven resistance control. It enables you to build self-calibrating analog sensor arrays, digital volume and gain controls for audio amplifiers, and closed-loop systems that automatically tune their own reference voltages based on environmental feedback all without a human ever touching a dial.
• Effort Level & Minimum Hardware Effort Level: Intermediate (Requires understanding of 3-wire digital timing and strict analog current limits)

Package includes:

• 1 x Digital Potentiometer Module X9C103S 10K for Arduino Raspberry

Frequently Asked Questions

• Is the X9C103S compatible with Arduino and ESP32?
  Yes, it uses a simple 3-wire digital interface that works perfectly with standard digital GPIO pins on any microcontroller.
• Can I use this module with a Raspberry Pi?
  Yes, you can control the logic pins using the Raspberry Pi's GPIO and standard Python digital output scripts.
• Does this module communicate via standard SPI or I2C?
  No, it uses a specific 3-wire interface (CS, U/D, INC), so it does not require hardware SPI or I2C pins.
• Can I use multiple X9C103S modules on the same microcontroller?
  Yes, simply tie all the U/D and INC pins together and use a separate, dedicated Chip Select (CS) pin for each module.
• What voltage is required to power the logic of this module?
  The VCC pin requires a stable 5V DC supply to operate the internal logic and EEPROM reliably.
• What is the maximum voltage I can apply to the analog terminals (VH and VL)?
  The voltage applied across the VH and VL pins must never exceed the VCC supply voltage (e.g., 5V maximum if VCC is 3.3V - 5V).
• How much current can safely pass through the wiper (VW)?
  The absolute maximum current rating for the wiper terminal is 4.4mA.
• How do I wire the logic control pins to my Arduino?
  Connect VCC to 3.3V - 5V, GND to GND, CS to any digital pin (e.g., 10), INC to another digital pin (e.g., 9), and U/D to a third digital pin (e.g., 8).
• What do the VH, VL, and VW pins do?
  VH is the high terminal (top), VL is the low terminal (bottom), and VW is the wiper (variable middle pin), acting exactly like the three legs of a manual rotary potentiometer.
• Do I need external pull-up resistors for the logic pins?
  No, the microcontroller can drive the CS, U/D, and INC pins directly without any external pull-up or pull-down resistors.
• Which Arduino library is best for the X9C103S?
  We recommend the DigipotX9Cxxx or FastX9C10x libraries, both available directly through the Arduino IDE Library Manager.
• How does the module remember its last resistance setting?
  It features an internal non-volatile EEPROM that automatically saves the wiper position, restoring it the next time the module is powered up.
• Can I read the current wiper position back into my microcontroller?
  No, the X9C103S is a write-only device; you must track its current step value (0-99) within your software variables.