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Digital Timers Counters and Clocks



Timers and Counters :


Timers and Counters along with Analog Process Controllers formed the front end of Industrial Automation.  Even today automation systems and control panels use analog timers and electromechanical counters. These are Indispensable. Analog + Digital combination controllers came next which were little bigger and offered better stability. They had thumbwheel switches as user interface in place of potentiometers.

Designing Mixed Analog Chips and Circuits

uP based Systems with chips like 8085 came after that, they consumed more power and were big in size. The coming of Cmos uC like 80C31 made Process Instrumentation Small and SMD made even 48 X 48 DIN sizes possible. Now Analog and uC based designs are used in different applications. Digital Hybrids and uP instruments are not used as they were Transient-Technology Methods.  

Digital Timers
                                      Counters and Clocks


Here are the source files for a timer project show above.  20017.zip,20029.zip, -  20030.zip.

Multi-Instrument Digital Assistant PIC16F84A

Multi-Instrument Digital Assistant - PIC16F84A - "It contains four instruments in one unit: logic probe, single channel logic state analyzer, frequency counter and serial code receiver."

Logisim -Simulate Digital Logic Circuits







What are Thumbwheel Switches

Thumbwheel switch, which has BCD output. It is used to Preset Values in Digital Instruments. Before Microcontrollers and RAM this was the Input device. Even now in industrial instrument this is a simple input device. Binary and Hexadecimal System

Selector or Thumbwheel Switches from CHERRY


Selector or Thumbwheel
                                    Switches from CHERRY

  

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