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Arduino Controlling 74C Shift Register
Sign up 74hc64 Facebook. I have few spare 74HC shift registers, so I decided to use them in this project. Ricardo 4, 14 37 Unfortunately page with description is in chinese or japanese. Circuit will be similar to this: Sign up or log in Sign up using Google. Earlier in the week, Jason emailed to ask exactly what the problems were with using a shift register to drive eight LEDs.
Email Required, but never shown. Sign up using Facebook. My guess is that you are just going to need to build the circuit and measure the Q7 delay under the specific conditions you intend to use. Now provide a clock and a direction line.
Home Questions Tags Users 74uc164. Suggest using 74HC parts which have a built-in latch- that way you won’t have ‘ghosting’. If we really have to, we can put inline resistors on each LED, but for testing, we left them off. Not sure I understand what you’re saying in the comments above, but it seems like you’re confusing clock with the serial input.
This will produce a slight flicker in the ON part of the bar graph, but this will generally les better that a ghost illumination of the OFF 47hc164. Although not too obvious in the video, because of the camera frame rate, every now and again you can see a visible flicker as the LED patterns update.
Alternative 1 – Instead of a data and a clock line, tie the shift register input high, and drive a clock line and a reset line. As Joe Hass says, the datasheet spec is at 50pF, which should be reasonably conservative for this application if the parts are all in close proximity on a board.
Arduino Controlling 74C164 Shift Register
Newer Post Older Post Home. If a digit is blank before and after an update, momentary illumination during an update can be surprisingly noticeable. Otherwise I would suggest using something like a 74HC I was looking for some ideas and I found this 7-segment LED driver:. You need to make sure that the clock period is longer than the sum of the maximum propagation delay of the Q7 output, plus the minimim input setup time of the AB inputs.
But it won’t trigger if 8-th bit MSb is low Joe Hass 7, 1 19 Then, shift right the proper number of times to display the bar size you want.
We’ve gone for 74HC shift registers, over the s, because these don’t require a latch line; this means that the outputs change immediately as the data is shifted in, but it also means one less connector on every PCB section.
Sign up or log in Sign up using Google. This is more noticeable in real life.