Note: The LEDs should be connected with the correct polarity, where the longer leg (anode) connects to the Arduino pin through a resistor, and the shorter leg (cathode) connects to GND. To implement the circuit for the given Arduino code that simulates a traffic light control system, you’ll need the following components:Ī 10k-ohm resistor (for pull-up on the button)Ĭonnect the Red LED's anode (longer leg) to digital pin 9 on the Arduino board through a 220-ohm resistor.Ĭonnect the Yellow LED's anode (longer leg) to digital pin 10 on the Arduino board through a 220-ohm resistor.Ĭonnect the Green LED's anode (longer leg) to digital pin 11 on the Arduino board through a 220-ohm resistor.Ĭonnect each LED's cathode (shorter leg) to GND on the Arduino board.Ĭonnect one push-button terminal to digital pin 2 on the Arduino board.Ĭonnect the other terminal of the push-button to GND on the Arduino board.Ĭonnect a 10k-ohm resistor between digital pin 2 and 5V on the Arduino board (this is the pull-up resistor). We will use a push-button to change the traffic light state. if no key is pressed is not running are held. for example: Button 1 should be run case 1. Actually, I will let run 4 different sequences with the switch case statement. In this example, we will simulate a simple traffic light system using three LEDs representing red, yellow, and green lights. The one with the LEDs was just a test program. The LEDs should be connected with the correct polarity, where the longer leg (anode) connects to the Arduino pin through a resistor, and the shorter leg (cathode) connects to GND. Note: Ensure the potentiometer is connected as a voltage divider between 5V and GND, and the middle terminal (wiper) is connected to analog pin A0. Similarly, connect the second LED’s anode to digital pin 10 through a 220-ohm resistor and the cathode to GND.Ĭonnect the third LED’s anode to digital pin 11 through a 220-ohm resistor and the cathode to GND. Three 220-ohm resistors (for current limiting the LEDs)Ĭonnect one end of the potentiometer to 5V on the Arduino board.Ĭonnect the other end of the potentiometer to GND on the Arduino board.Ĭonnect the wiper (middle terminal) of the potentiometer to the analog pin A0 on the Arduino board.Ĭonnect the first LED's anode (longer leg) to digital pin 9 on the Arduino board through a 220-ohm resistor.Ĭonnect the first LED's cathode (shorter leg) to GND on the Arduino board. Three LEDs (different colors if possible) To implement the circuit for the given Arduino code, you’ll need the following components: This function (given at the bottom) can be pasted in the beginning of the files where the function is needed. Suppose you have three LEDs connected to pins 9, 10, and 11, and you want to control their state based on the value of a single sensor. at 19:50 Add a comment 12 Answers Sorted by: 39 ardprintf is a function that I hacked together which simulates printf over the serial connection.
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