Those capacitor are used to avoid flicker when the latch pin pulses (source: ). Notice for a 1uF capacitor connected on the latch pin. The GND pin are connected to the circuitry ground and the Arduino ground pin. Data, Clock, Data-M, Clock-M, Clear, and Latch pin are connected to the Arduino digital pins.
QM1 to QM8 are connected to the common pin of each 7-segment respectively.
QA to QH are the output of SR A and are connected to the 7-segments A to H pin respectively. Multiplexing the 7-Segment Display Two 74HC595 Shift Registers used in Arduino Digital Clock to multiplex up to 8 7-segments and send the 7-segment data serially.Īssuming the two shift registers (SR) are named A (IC1) and B (IC2), SR A used to transfer the 7 segment data serially and SR B used to shift/move from each digit to another. One 74HC595 shift register is able to multiplex 8 7-segments display at maximum. We do this really fast in <3ms so human eyes will see all the digits were lights up together. We only able to display 1 digit at a time, so we have to display all the digits one by one. The first shift register is used to transfer 8-bit 7-segment data serially for each digit from the Arduino and the other one is to multiplex the displayed digit one-by-one. In this project, I’m using digital multiplexing technique by using 2 74HC595 shift-register with latch ICs. In this post I’m trying to write down my experiment in using Arduino as 7-segment digital clock display controller driver. Arduino has become one of the easiest microcontroller platform to develop and therefore it is open source.
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