![]() ![]() This table contains the bytes that must be written to the LED segments for displaying digits 0 to 9.Ī function spiTransfer() is defined that shiftOut() function to transfer 16-bit data to MAX7219 IC. The variables are defined to store values of seconds, minutes, hours, clock mode, and select.Ī character table is stored in the flash memory of Arduino UNO using PROGMEM construct. A variable of an array type is defined to store 16-bit commands for MAX7219. The global variables are defined to assign pin numbers connected to DIN, CLK, and LOAD pins of MAX7219 IC. The Arduino sketch begins by importing the SPI library of Arduino. ![]() If the seconds or minutes is incremented above 59 or hours is incremented above 12, they are reset to 0. The push button at pin 2 increments the selected time element – seconds, minutes, or hours. The pushbutton at pin 1 allows switching to the selection of seconds, minutes, and hours. The push buttons at pins 1 and 2 are operational only when the clock is in time-setting mode. The pushbutton at pin 0 of Arduino switches the clock between the two modes. In time setting mode, the user can set the time using push buttons. In normal mode, the clock simply displays the current time, and Arduino updates it every second. The clock operates in two modes – normal mode (mode 0) and time setting mode (mode 1). A pair of 7-segments is used each to display seconds, minutes, and hours. There are 6 7-segments used with MAX7219 IC. The button at pin 2 increments the selected clock element, seconds, minutes, or hours. The button at pin 1 allows selecting seconds, minutes, and hours. The button at pin 0 controls the mode of the clock. These Arduino pins are internally pulled up. These pushbuttons are interfaced at pins 0, 1, and 2 of Arduino UNO. The MAX7219 module is supplied 5V DC and ground from the Arduino itself.Īlong with the MAX7219 IC-based 7-segment driver, 3 push buttons are also connected to the Arduino. The DIN, LOAD, and CLK pins of the IC are connected to the pins 12, 10, and 11 of the Arduino UNO, respectively. MAX7219 communicates with Arduino using an SPI-compatible interface. The DIN, LOAD, and CLK pins of the IC can be connected to digital I/O pins of Arduino. The pin 18 of MAX7219 is also connected to 5V DC via a suitable resistor. Pins 4 and 9 of the IC are hard-wired to ground, and pin 19 is connected to the 5V terminal. The common-cathode terminals of the segments are connected to the DIG0 to DIG7 pins of MAX7219. In the module, the data pins of the 7-segments are connected to SEG A to SEG G and DP pins of MAX7219. It allows interfacing a microcontroller to 7-segment display units up to 8 digits. MAX7219 is an 8-digit common-cathode LED display driver. The digital clock designed here is based on the MAX7219 IC-based 7-segment driver module. The digital clock designed here displays the current time and allows users to set or reset time. As microcontrollers are usually capable of generating delays of a precise interval, this basic digital clock is built using microcontroller features alone. Here, a digital clock is designed using Arduino, 7-segments, and MAX7219 IC. Electronic clocks are built using microcontrollers and may or may not use a real-time clock. The users can set or reset the clock using buttons. ![]() A digital clock keeps track of time and displays the current time through an output device. A digital clock is a commonly used electronic gadget.
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