On eBay? I hope you opened a dispute!
The Arduino generates binary code - 8 bits / 1 byte (i.e. 00010000) to depict a 7 segment digit numberThis info is sent in serial (via a single line) to the shift register - pin 3 (SER IN)?Each bit is sent/received 1 at a time and shoves the next spot in the register until all 8 are filled up (received)To snapshot this, via the Arduino, "latch" is changed from Low to High - this is pin 12 (RCL) or the registerThis flip causes the bits to be copied to each of register output pins (drain0 to drain7)This then repeats replacing the bits in the shift registerNow, to cascade, is this correct?All the 15 drain0's are connected together, and all 15 drain1's, are connected together etc, etcAll 15 latch pins are connected together - pin 12?All 15 clock pins are connected together - pin 13?To "shunt?" the 8 bits down from the first register to the next and next, pin 18 (SER OUT) is connected to pin 3 (SER IN) of the next register, and so onCommon anodes (in my case) are connected directly to 24VThe arduino PWM signal is connected to all the output enable pins (G) - pin 9 of each registerThe arduino sends out 15 bytes at a time which fill each of the 15 shift registers
So does this mean that 15 bytes of info are sent by the arduino ever microsecond or so, hence any change in 8-bit is displayed immediately in the 7 segment displays so 100 duty cycle?
And does it also mean that the dimming all the displays is controlled by a PWM signal from the Arduino to pin 9 of every shift register which essentially essentially creates a sort of duty cycle/pulse width?
Maybe a question for Bob - other than the 15 shift registers, 20 pin IC sockets and 0.1uF caps for each register, is there any other basic components that I need to get started for this test?
All the 15 drain0's are connected together, and all 15 drain1's, are connected together etc, etc
You mean alice1101983? They run the TxHang shop.
No, your sketch only sends the data when you want to change something. So for example if you were displaying the time as hh:mm you would only need to update once per minute
For your small 7-seg displays, probably be ok, maybe add a 10uF for each display. For your large displays, some much larger caps, maybe 1000uF per digit.
All devices receive clock and latch in parallel.1st device gets Serial data from processor, it's Serial Out goes to Serial In on next chip. Example...
I "thought" that each IC needs a 0.1uF capacitor as close to the Vcc as possible and ground in order to stop any resilient "noise".
All devices receive clock and latch in parallel.1st device gets Serial data from processor, it's Serial Out goes to Serial In on next chip.