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Control Angle via Button Pushes

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Control Angle via Button Pushes

One button increases angle.

Other decreasesangle.Both light LED.

Servo Control Using Analog Signal

Obtain “analog” input

using analogRead().

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).
- Argument of analogRead()is the pin to read(only pins labeled ANALOGIN can be used).
- Servo position varies between 0 and 180.Therefore, must divide analogRead()whatreturns by 5.68333 (1023 / 5.68333 = 180).

Control Angle via Button Pushes

One button increases angle.

Other decreasesangle.Both light LED.