# Control Angle via Button Pushes - PowerPoint PPT Presentation

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Control Angle via Button Pushes. One button increases angle. Other decreases angle. Both light LED. Servo Control Using Analog Signal. Obtain “analog” input using analogRead () . Voltage, V. Voltage tells us how hard a positive charge is pushed between two different points.

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Control Angle via Button Pushes

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#### Presentation Transcript

Control Angle via Button Pushes

One button increases angle.

Other decreasesangle.Both light LED.

Servo Control Using Analog Signal

Obtain “analog” input

Voltage, V

• Voltage tells us how hard a positive charge ispushedbetween two different points.

• Something, such as a battery, is needed to createa voltage.

Current, I

• Current tells us the amount of chargeflowing throughsomething (similar to gallons per minute).

• Current must have a path through which to flow.

I = V / R

Resistor:

R

V = 5, R = 5, I = ?

What Is the Measured Voltage?

0V

5V

What Is the Measured Voltage?

5V

5V

What Is the Measured Voltage?

0V

0V

What Is the Measured Voltage?

0V

5V

What Is the Measured Voltage?

2.5V

What Is the Measure Voltage?

5V

4V

3V

2V

1V

0V

Potentiometer

• Voltage at wiper depends onposition along the resistor.

• Voltage varies between ground(0V) and the supplied voltage(5V in this case).

• Voltage various continuously(analog “signal”).

WIPER

Conversion of Analog to Digital

• Obtain “analog” input using analogRead().

• analogRead()returns a value between 0 (if pin at ground) and 1023 (if pin at 3.3 V).