The Touch Potentiometer is an intelligent linear capacitive touch sensor that implements potentiometer functionality with 256 positions.

It can operate as a peripheral to a computer or embedded micro-controller or in a stand-alone capacity. The Touch Potentiometer provides both a dual-channel analog and PWM output for direct control of other circuitry. Configurable analog and PWM transfer functions support a wide variety of applications.

Example code for arduino, circuit ideas and the "tputil" program used to configure the Touch Potentiometer can all be found on my website accessed through the Documentation link.

Features:

• Full 8-bit (256 count) range
• Dual host interfaces: Logic-level serial and I2C
• Dual 8-bit 20 k-ohm 3-terminal digitally controlled variable resistor outputs
• PWM output
• 8 LED display with multiple display modes and intensity levels
• Option for interpolated (soft) changes between touches
• Configurable touch sensor parameters for a variety of PCB covers
• Easily configurable I2C address to allow multiple devices on one bus
• Configurable linear or non-linear PWM transfer function
• Configurable linear or simulated logarithmic variable resistor transfer function
• Variable resistor supports single- or dual-supply operation
• Simple register interface with jabber option
• Programmable power-on default operation
• User-accessible EEPROM data storage

Applications:

• Analog potentiometer replacement
• Stereo channel audio level control
• Computer peripheral
• Embedded system control
• Dimmer for LED lighting applications
• DAC replacement