Drip Rate Counter Circuit

[Osama Mohammed]

Hi,

 

 

 

I want to design a circuit that  especially made to sense the drops of fluids in the medical infusion pump ,this is done by using of an ir led as a transmitter and phototransistor as a reciever , and whenever the drops pass between them , the light is interrupted ,then the voltage variations goes to microcontroller in order to calculate the drip rate of the infusion pump.

 

 

This my circuit: 

 

What do you think? would it satisfy my purpose? ,do I need to add or remove any component ? 

 

I want to simulate it using isis proteus program but I couldn’t find the phototransistor in the components library ,why !!? is there a way to simulate this circuit and how it’s affected when drops falls down ?

 

 

[AJISH ALFRED]

Hi,

The circuit looks ok for me, so please don’t waste time on any simulation software. These components are easily available in market and cheap.

[Ganesh Selvaraj]

You can instead connect a button switch tied to +5V to simulate the liquid drip. each time u press the button, it would be like a drop passing through the sensor arrangement.

 

But note that it is only for simulation purpose and it can only theoretically check if your program is working. For getting the actual output, it is better to use real hardware components like Mr. Ajish said.

[Ashutosh Bhatt]

two things you must care about

the gap between two successive drops (rate of drops)

sensitivity of photo diode.

this will decide circuit perfomance

[Author]

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