I wasn't a fan of the code I found for it so decided to write my own Ardunio library. Writing your own library is the best way to understanding how it works. I have posted information and the code here. https://monotok.org/arduino-using-c-to-write-7-segment-4-bit-display-driver/

I wasn't a fan of the code I found for it so decided to write my own Ardunio library. Writing your own library is the best way to understanding how it works. I have posted information and the code here. https://monotok.org/arduino-using-c-to-write-7-segment-4-bit-display-driver/

I wasn't a fan of the code I found for it so decided to write my own Ardunio library. Writing your own library is the best way to understanding how it works. I have posted information and the code here. https://monotok.org/arduino-using-c-to-write-7-segment-4-bit-display-driver/

Send 16-bit word serial messages for the two 74hc595 controllers. High byte = segments ".gfedcba" active low. Lowest 4 bits of low byte selects digit(s) to display. High 4 bits = don't care Send bit 15 first, bit 0 last. Clock each data bit on DIO with a positive SCLK edge. After 16 bits are clocked in, latch with a positive edge on RCLK. If daisy-chaining, 16 bits per module, then RCLK edge. Proceed to next digit. Look at avg 5ms per digit or less, to give a steady display. RCLK and SCLK only cares about rising edges, not levels. Typically, you will lower RCLK at start of a word, place a bit on DIO and then give SCLK a high pulse. When all 16 bits are done - raise RCLK again. Adjust for number of segments. A "1" will be much brighter than a "8" with same delay. 1ms per displayed segment in a digit is a good starting value. Example: write 12.34 word0: 11111001 00001000 ; segments "1", digit 3, no decimal point, delay=2ms word1: 00100100 00000100 ; segments "2", digit 2, with decimal point, delay=6ms word2: 10110000 00000010 ; segments "3", digit 1, no decimal point, delay=5ms word3: 10011001 00000001 ; segments "4", digit 0, no decimal point, delay=4ms For small microcontrollers, I suggest lookup tables for both segment encoding and delay. Add one to delay if decimal point is used on that digit.

Send 16-bit word serial messages for the two 74hc595 controllers. High byte = segments ".gfedcba" active low. Lowest 4 bits of low byte selects digit(s) to display. High 4 bits = don't care Send bit 15 first, bit 0 last. Clock each data bit on DIO with a positive SCLK edge. After 16 bits are clocked in, latch with a positive edge on RCLK. If daisy-chaining, 16 bits per module, then RCLK edge. Proceed to next digit. Look at avg 5ms per digit or less, to give a steady display. RCLK and SCLK only cares about rising edges, not levels. Typically, you will lower RCLK at start of a word, place a bit on DIO and then give SCLK a high pulse. When all 16 bits are done - raise RCLK again. Adjust for number of segments. A "1" will be much brighter than a "8" with same delay. 1ms per displayed segment in a digit is a good starting value. Example: write 12.34 word0: 11111001 00001000 ; segments "1", digit 3, no decimal point, delay=2ms word1: 00100100 00000100 ; segments "2", digit 2, with decimal point, delay=6ms word2: 10110000 00000010 ; segments "3", digit 1, no decimal point, delay=5ms word3: 10011001 00000001 ; segments "4", digit 0, no decimal point, delay=4ms For small microcontrollers, I suggest lookup tables for both segment encoding and delay. Add one to delay if decimal point is used on that digit.

Send 16-bit word serial messages for the two 74hc595 controllers. High byte = segments ".gfedcba" active low. Lowest 4 bits of low byte selects digit(s) to display. High 4 bits = don't care Send bit 15 first, bit 0 last. Clock each data bit on DIO with a positive SCLK edge. After 16 bits are clocked in, latch with a positive edge on RCLK. If daisy-chaining, 16 bits per module, then RCLK edge. Proceed to next digit. Look at avg 5ms per digit or less, to give a steady display. RCLK and SCLK only cares about rising edges, not levels. Typically, you will lower RCLK at start of a word, place a bit on DIO and then give SCLK a high pulse. When all 16 bits are done - raise RCLK again. Adjust for number of segments. A "1" will be much brighter than a "8" with same delay. 1ms per displayed segment in a digit is a good starting value. Example: write 12.34 word0: 11111001 00001000 ; segments "1", digit 3, no decimal point, delay=2ms word1: 00100100 00000100 ; segments "2", digit 2, with decimal point, delay=6ms word2: 10110000 00000010 ; segments "3", digit 1, no decimal point, delay=5ms word3: 10011001 00000001 ; segments "4", digit 0, no decimal point, delay=4ms For small microcontrollers, I suggest lookup tables for both segment encoding and delay. Add one to delay if decimal point is used on that digit.