Page 103 - KEC Khaitan C8.2 Flipbook
P. 103
Step 3 Writing and Uploading a Basic Sketch
Open the Arduino IDE and write a simple sketch to control the three LEDs (block code
from Tinkercad may be downloaded and used here).
Upload the code to the Arduino Uno using a USB cable.
Step 4 Building a Traffic Light System
Circuit Design and Assembly:
o Place LEDs on the breadboard, and connect resistors to their anodes.
o Wire the LEDs to Arduino pins (red = pin 8, yellow = pin 9, green = pin 10).
o Connect the breadboard's ground and power rails to the Arduino.
Circuit Design Hardware Design
Bonus Challenge:
Add a pedestrian crossing button using a push button.
Program the traffic lights to pause and allow pedestrians to cross when the button is pressed.
Important Notes:
Always double-check connections before powering the circuit.
Debugging is part of the learning process. Use the Arduino Serial Monitor to check for errors.
Ensure resistors match the LED's voltage and current ratings to prevent damage.
Troubleshooting Tips:
If LEDs don't light up, check:
o LED polarity (anode and cathode connections).
o Resistor values (ensure they are not too high or low).
o Arduino code (ensure pins are correctly defined).
Hands-On Project 101

