This circuit is designed to interface an Arduino UNO with a variety of components including two servo motors, two LEDs (one red and one green), a set of resistors, and a 4×4 keypad. The Arduino UNO acts as the central controller, providing power and control signals to the servos, lighting up the LEDs, and receiving input from the keypad. The servos are powered by the Arduino's 5V output and are controlled via PWM signals. The LEDs are connected through resistors to limit the current and are controlled by digital outputs from the Arduino. The keypad is interfaced with multiple digital pins for detecting key presses.
5V
pin provides power to both Servo VCC pinsGND
pin is connected to the GND pins of both Servos, both LED cathodes, and the 4×4 KeypadD13
pin is connected to a 220 Ohm Resistor, which connects to the anode of the red LEDD12
pin is connected to a 220 Ohm Resistor, which connects to the anode of the green LEDD11
to D2
pins are connected to the 4×4 Keypad pins C4
to R4
respectivelyD10
and D9
pins provide PWM signals to the ServosVCC
pin connected to Arduino's 5V
GND
pin connected to Arduino's GND
PWM
pin connected to Arduino's D10
or D9
for controlcathode
pin connected to Arduino's GND
anode
pin connected through a 220 Ohm Resistor to Arduino's D13
cathode
pin connected to Arduino's GND
anode
pin connected through a 220 Ohm Resistor to Arduino's D12
D13
or D12
C4
to R4
pins connected to Arduino's D11
to D2
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
This code is a template for the Arduino UNO and does not contain any functional code. It provides the basic structure with an empty setup()
function, which runs once upon a reset or power-up, and an empty loop()
function, which runs continuously after setup()
completes. The user is expected to fill in these functions with code to control the servos, read the keypad, and manage the LEDs.