The SparkFun Touch Potentiometer, or Touch Pot for short, is an
intelligent linear capacitive touch sensor that implements
potentiometer functionality with 256 positions.
It can operate as a peripheral
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 such as volume control and LED
dimming.
The Touch Potentiometer is controlled by a Microchip PIC16F1829 8-bit
micro-controller that provides the host interface, LED control,
capacitive sense and peripheral control functions. A built-in
low-dropout voltage regulator allows operation over a range of input
voltages up to 12V and breadboard friendly connectors make it easy to
play with. A desktop application has been created by our collaborator,
Dan Julio, that communicates with the Touch Pot over a serial
connection. From this utility app you can change configuration
settings, alter LED behavior, calibrate the capacitive touch sensor,
view current readings in jabber mode, and much more.
Features:
* Dual host interfaces: Logic-level serial and I2CTM
* 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
* Built-in calibration procedure
* User-accessible EEPROM data storage
* Built-in 5V LDO voltage regulator
* Through-hole and SMT connectors
Links:
* Design Files @GitHub [1]
Links:
------
[1] https://github.com/sparkfun/Touch_Potentiometer
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 such as volume control and LED
dimming.
The Touch Potentiometer is controlled by a Microchip PIC16F1829 8-bit
micro-controller that provides the host interface, LED control,
capacitive sense and peripheral control functions. A built-in
low-dropout voltage regulator allows operation over a range of input
voltages up to 12V and breadboard friendly connectors make it easy to
play with. A desktop application has been created by our collaborator,
Dan Julio, that communicates with the Touch Pot over a serial
connection. From this utility app you can change configuration
settings, alter LED behavior, calibrate the capacitive touch sensor,
view current readings in jabber mode, and much more.
Features:
* Dual host interfaces: Logic-level serial and I2CTM
* 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
* Built-in calibration procedure
* User-accessible EEPROM data storage
* Built-in 5V LDO voltage regulator
* Through-hole and SMT connectors
Links:
* Design Files @GitHub [1]
Links:
------
[1] https://github.com/sparkfun/Touch_Potentiometer
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