1. S

    Alternatives of break-beam sensors (one-side implementation instead of both)

    Hi, I would like to know if there's any alternatives that can replace break-beam sensors in this situation — a gate that counts how many people has passed through using a sensor implemented on one side. If there aren't any alternatives, can an ultrasonic sensor be used to replace the break-beam...
  2. J

    Optimizing a circuit

    Hi, Just finished doing my first proper schematic(*) and I'm worried that it's a bloated over engineered lump of components. What I'm trying to do is having 3 LEDs, powered by 2-3 AA batteries fade in and out. I've added a 4th LED which will be on when all 3 are off, I realize that could be...
  3. P

    0 to 9, 9 to 0 counter

    Hi there, got a serious problem about Counters. i have to create "a circuit that counts from 0 to 9 then from 9 to 0 using two separate counters" and "must consider BUS concept". i used two 74192 and two 74153 Multiplexers ( for BUS ), one of the counters is ascending and another one is...
  4. P

    0-9 Counter Downing Problem

    Hi,in the circuit numbers that come from counter are compared with 1 and the numbers are equal or greater than 1 led turns on.Also when the number reaches 9,it shouldn't move to 0(when press up button) and reaches 0 shouldn't move to 9.(when press down button) On the breadboard upping works...
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