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BarGraph 2 click is a 10-segment bar graph display click, which uses a high-quality, multicolor bar graph LED display. The bar graph display is a very popular device for displaying various properties, whether it be an audio level, current/voltage level, position of the encoder, and generally any property that can be displayed in a form of a bar graph. The segments of the onboard bar graph LED display are bright and uniformly colored, providing a nice and clean visual feedback.
BarGraph 2 click is a 10-segment bar graph display click, which uses a high-quality, multicolor bar graph LED display. The bar graph display is a very popular device for displaying various properties, whether it be an audio level, current/voltage level, position of the encoder, and generally any property that can be displayed in a form of a bar graph. The segments of the on-board bar graph LED display are bright and uniformly colored, providing a nice and clean visual feedback.
Each segment is composed of green and red colored LEDs, making it possible to have various important states marked in different color. It can use green, red, and a combination of these two – resulting in having amber colored segments. For example, a VU-meter can have its highest values shown in red (peaks), middle in yellow and the lowest in green; the position of the encoder can be marked with a single red segment, on a green background, and so on. The bar graph display light intensity can be dimmed, by applying a PWM signal. The Click board™ offers a lot of possibilities for building a custom bar graph applications – VU meters, status indicators, various types of gauges, and similar.
The XGURUGX10D bar graph LED array has 10 dual-color segments. Each segment contains red and green LED, thus having two anodes and one cathode per segment. This results in having 20 LED anodes and 10 LED cathodes, in total. The XGURUGX10D bar graph display is connected as a common cathode type display, meaning that all LED cathodes are routed to a single point. The LED cathode line is connected to the drain of the N channel MOSFET, while its source is connected to the GND. Driving this MOSFET via its gate through the PWM pin of the mikroBUS™ allows dimming of the LED segments. By changing the duty cycle of the PWM signal, it is possible to change the brightness of the XGURUGX10D bar graph display.
The Click board™ communicates with the host MCU via the SPI interface, routed to the mikroBUS™ MOSI, MISO and SCK pins, labeled as SDI, SDO and SCK on this Click board™, respectively. Three bytes of information (24 bits in total) are pushed through the serial data input pin (DS) of the first 74HC595 IC, routed to the SDI pin. The 74HC595 construction is such that after receiving 8 bits, clocking in one more bit will shift the existing 8 bits by one place, overflowing the last bit to the Q7S output pin, shifting it out that way. Since the Q7S of the first 74HC595 is connected to the DS pin of the second 74HC595 (and the Q7S of the second IC is connected to the DS pin of the third 74HC595 IC), clocking in 24 bits to the first 74HC595 IC will fill up all three ICs.