MIKROE Slider Click features a mechanical slide action potentiometer - a slider, which gives a nice feeling when actuating, along with 16 SMD LEDs, that can be used for any kind of visual feedback. The onboard high-resolution 22-bit ADC can detect even the smallest move, faithfully capturing the smoothness of the slider movement, while digitizing its position. The 16 onboard SMD LEDs can give a nice visual feedback of the slider position, but those LEDs can also be used for other purposes since they are not hardwired to the slider.
Slider Click can be used to control various digital applications with an accurate and comfortable slider potentiometer, while the LEDs can be used to display the desired information in a form of a bar or a position. For example, Slider Click can be used to control a quad digital potentiometer, such as the one that can be found on DIGIPOT 5 click, while displaying the position of the selected digital wiper on the LEDs.
Slider Click consists of two sections: the first section is the slider section itself, with the sliding potentiometer end terminals connected between GND and the VCC, and the wiper connected to the MCP3551 IC, which is a low-power, single-channel 22-bit delta-sigma ADC from Microchip. The slider acts as a voltage divider so that the voltage between the GND and the wiper position is determined by the slider position. This voltage is then applied to the input pin of the 22bit ADC converter and converted to a digital value. The MCP3551 has its SPI lines routed to the mikroBUS™ so that the values can be read easily by the MCU.
The second section of this Click board™ consists of the MAX6969, a well know 16-port, constant-current LED driver from Maxim Integrated, used to control the SMD LEDs. The MAX6969 IC uses the same SPI lines as the ADC, but to avoid data collision, different chip select (CS) line is used. While the ADC uses the CS line routed to the CS pin of the mikroBUS™, the LED driver uses the RST line of the mikroBUS™ as the chip select input. This allows to work with both ICs independently. MAX6969 output enable (OE) pin is routed to the AN pin of the mikroBUS™, making it easy to completely turn off the output stage of the MAX6969, by setting this pin to a HIGH logic state. If left floating, this pin will be pulled down to the GND by the 10K resistor. The output LED current is constant and it is set to around 20mA by the resistor on the SET pin of the MAX6969.
his Click board™ can work with both 3.3V and 5V, depending on the used MCU capabilities. This can be done by switching the VCC SEL SMD jumper to the desired position.
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