Friday, July 10, 2015

Circuit Schematic Simple RPM Counter using IC 555

Eltronicschool. - Do you want to make your own self Simple RPM Counter using IC 555? Circuit schematic like in figure 1 below maybe will be suitable for this Simple RPM Counter.

Circuit Schematic

Figure 1. Circuit Schematic Simple RPM Counter using IC 555
(Source: EngineerGarage)

Component Parts
  1. CD4026 IC
  2. Optocoupler 
  3. NE555 IC
  4. Resistors
  5. LED
  6. Capacitors
  7. Seven Segment CC


Circuit schematic like in figure 1 above is circuit schematic Simple RPM Counter using IC 555. According EngineerGarage site describe that RPM counters are used to measure Speed of Motors (AC/DC) or any Rotating Object. They measures and indicates current Rotating Speed of Motor. They are very essential in applications like Speed Control of Motors and close Loop Control System. Such industrial RPM counters are very accurate made up of microcontroller or microprocessor.

The circuit presented here is simple RPM counter without any microcontroller or microprocessor. It actually measures RPS – Revolutions per Second. By just multiplying RPS – Revolutions per Second with 60 we get RPM because

Revolutions per Minute = 60 × Revolutions per Seconds

It is built using simple Components like NE555, Decade Counter CD4026, and opto-interrupt Sensor MOC7811. It counts Motor Revolutions for 1 second and displays it on 2-digit Seven Segment Display. That is the RPS. To get the RPM we have to multiply this count with 60. Not only that, the time for which it Counts Revolutions can be set to 5 second or 10 second. So for slow RPM motors we can set different time. E.g. time is set for 5 second. So revolutions are counted for 5 second. Finally

RPM = 12 × Revolution Count

Similarly if time is set for 10 second

RPM = 6 × Revolution Count

Thus for higher RPM (>1000) motors, time is set for 1 second and for lower RPM Motor time is set for 5 second or 10 second. And now you can see more this Circuit Schematic Simple RPM Counter using IC 555 from original source using link here.

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