How can you reduce the sound emitted from the buzzer How can

How can you reduce the sound emitted from the buzzer? How can you reduce the amount of current that the buzzer tends to draw from the Arduino? What type of device switches the LED\'s based on the reference voltages?

Solution

1.  measure the resistance of the buzzer, then place a resistor the same value as the buzzer in series with it, see how much this drops the volume.
The more resistance to quieter the buzzer should be.
If the buzzer does not work with half the value try a value lower in resisitance.

2. Try to get the data sheet first... To understand better we will discuss with example

According to the datasheet, it\'s specs are:

Using Ohm\'s law

V=RI

we can see that, without a series current limiting resistance, the buzzer coil resistance will let 100mA pass through it. That\'s past its maximum current rating, so we need to take it to a lower level.

We need to leave some room below the maximum rated current of 40mA and also stay within safe current levels that the Arduino output pin can source or sink, which is about 20mA. So let\'s shoot for that (20mA). That means we need to have 250 total resistance.

R=V/I=5[V] / 0.020[A]=250R

The buzzer already has 47, so wee need to place we need to place a series resistor of 200 to get to the 250 that we want.

3.Microcontrollers are highly recomended in industrial applications. Example :TM4C and LM3s series