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Found 3 results

  1. I am trying to create a manual demonstration circuit for a 74HC595 (here is the datesheet of 74HC595)shift register. Se my circuit below. The problem I am having is that I am only getting a +0.7V signal to the data, clock, and latch pins of the 74HC595 when one of the buttons are pushed. The S4 RESET switch works fine (normally high at 5V, press switch to bring down to 0V), however S1, S2, and S3 do not accomplish the reverse scenario (normally LOW, press switch for HIGH) correctly. You will note that I am also trying to debounce the switching with a capacity or resistor. I suspect this deboun
  2. A display is a nice thing to have in many projects. A very cheap solution for only 2$ to 4$ is a 4 digit display from Qifei that can be found e.g. at www.Aliexpress.com. Of course, for this price you do not get a user manual! But what beats me is that I could not find a usable description on the internet. Therefore I had to rely on trial and error. Here is what I learned. The device has 2 cascaded 74HC595 shift registers, one for the digit select, the other for segements select. By this the deviceu can only display one digit at a time. Therefore, you must time multiplex the for digits fast en
  3. Hello everyone! I'm continuing my project of creating an RGB LED matrix capable of displaying live images being transmitted from a laptop via a serial cable to the MSP430G2553. At the moment, I'm coding four 8x8 Common Anode RGB LED matrices joined together to create a 16x16 display. Hardware I'm using: - 3 * TLC5940s (one for each colour) - 2 * 74HC595 shift registers (drives the columns/anodes) I'm using code provided by RobG from this link <http://forum.43oh.com/topic/2315-tlc5940-examples/> and this one <http://forum.43oh.com/topic/3328-rgb-to-hsv-conversion-with
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