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Mikroelektronika d.o.o.

Kappenrad-Klickplatine

Kappenrad-Klickplatine

SKU: MIKROE-3203
Normaler Preis
€14,95 EUR ohne MwSt
Normaler Preis Verkaufspreis
€14,95 EUR ohne MwSt
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Overview

Das CAP Wheel Click Board™ ist ein kapazitiver Berührungssensor mit runden Elektroden, die auf einem Click Board™ integriert sind. Dieses Click Board™ kann Berührungen sogar durch Kunststoff, Holz oder andere dielektrische Materialien hindurch wahrnehmen, die zum Schutz der Oberfläche der Leiterplatte und der Sensorpad-Leiterbahn selbst verwendet werden können. Daher wird das CAP Wheel Click Board™ mit einer Auflage aus Plexiglas geliefert. Im Gegensatz zum mechanischen Knopf hält der kapazitive Berührungsknopf viel länger, er ist nicht anfällig für Beschädigungen und Verschleiß im Laufe der Zeit und er ist sehr zuverlässig.

Capacitive sensors are a very popular method of controling various devices. Besides the aforementioned benefits, having a touch sensitive button on a device allows for a compact design, opens possibilities for various kinds of human-machine interface and - it looks good and modern, especially if 8 LEDs array thatthe CAP Wheel Click Board™ has onboard is taken into account. The CAP Wheel Click Board™ can find its place among many applications - for touch activated lighting controls, process control, touch activated control panels, toys and any other applications that need a switch or an encoder.

How Does The CAP Wheel Click Board™ Work?

Although it looks simple at first glance, capacitive touch sensing is not an easy task. There are many parameters that need to be sampled, filtered, compared and processed before positive touch detection and its position are confirmed. To make this possible, Cap Touch click utilizes the IQS333, ProxSense® IC, a 9-channel projected (or 7-channel self) capacitive proximity and touch controller from Azoteq. This IC has some advanced features such as the auto drift compensation, Long proximity range, Automatic adjustment for optimal performance (ATI), two Configurable 11-bit sliders/scroll wheels and more. These features enable the CAP Wheel Click Board™ to exhibit very reliable and accurate touch detection.

Cap Wheel Click inner

Capacitive touch sensing is based on detecting a change in capacitance, due to the influence of a foreign object. Basically, the capacitance of the sensor, also known as the antenna, is measured and monitored and if a significant change occurs, after processing by the detection integrator, a touch event is acknowledged. To maximize performance, many routing requirements need to be met in the sensing electrodes design. The relation between the sensing elements in position and size is crucial. The CAP Wheel Click Board™ is designed with these requirements in mind and electrodes are "Self-Capacitive Wheel" shaped.

The CAP Wheel Click Board™ also contains 8 LEDs whose function can be user-defined. LEDs are connected to PWM LED driver pins on IQS333 which means that the user can turn LEDs on or off and control illumination, using the dimming modes that IQS333 supports.

The IQS333 IC interfaces to a master controller via a 3-wire (SDA, SCL, and RDY) serial interface bus that is I2C™ compatible, with a maximum communication speed of 400kbit/s. The host MCU has the capability to force a communication at any time, by pulling the RDY line low. The communication will start directly following the current conversion cycle. If the event is terminated by the watchdog timer, the device will reset.

After every power on cycle, the device will recalibrate itself. It will take some time, so it should be taken into consideration when building custom applications. MikroElektronika provides libraries and the demo application, that can be used as a reference for any future designs.

As mentioned before, the CAP Wheel Click Board™ is I2C™ compatible and uses SCL, SDA and RDY pins for communication which are routed to SCL, SDA and INT pin on mikroBUS™ respectively. Besides that, CLR pin is available on board which is routed to RST pin on mikroBUS™ and used to master reset the IC.

SPECIFICATIONS

Type Capacitive
Applications It can be used for touch activated lighting controls, process control, touch activated control panels, toys and any other applications that need a switch or an encoder.
On-board modules IQS333, ProxSense® IC, a 9-channel projected (or 7-channel self) capacitive proximity and touch controller from Azoteq.
Key Features Auto drift compensation, Long proximity range, Automatic adjustment for optimal performance (ATI), 2 Configurable 11-bit sliders/scroll wheels and more.
Interface GPIO,I2C
Compatibility mikroBUS
Click board size L (57.15 x 25.4 mm)
Input Voltage 3.3V

PINOUT DIAGRAM

This table shows how the pinout of the CAP Wheel Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes Pin Mikrobus logo.png Pin Notes
NC 1 AN PWM 16 NC
Master Clear CLR 2 RST INT 15 RDY Ready Output
NC 3 CS RX 14 NC
NC 4 SCK TX 13 NC
NC 5 MISO SCL 12 SCL I2c Clock
NC 6 MOSI SDA 11 SDA I2C Data
Power Supply +3.3V 7 3.3V 5V 10 NC
Ground GND 8 GND GND 9 GND Ground

ONBOARD SETTINGS AND INDICATORS

Label Name Default  Description
LD1-LD8 - - User configurable LED indicator
LD9 PWR - Power LED Indicator

 

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