The document describes the components and workings of a smart traffic light controller using a NodeMCU (ESP8266). The system uses ultrasonic sensors to detect traffic and NodeMCU to control LED lights for the different directions. It can send notifications to users and manage traffic flow without wasting much energy. Resistors are used to control LED brightness. A breadboard allows changing connections without soldering.

1. SMART TRAFFIC
LIGHT
CONTROLLER
USING NODEMCU

2. COMPONENTS REQUIRED FOR SMART TRAFFIC
LIGHT CONTROLLER USING NODEMCU(ESP 8266)
• nodemcu(ESP 8266)
• 4 X HC-SR04 ultrasonic sensors
• 4 X Red LEDs
• 4 X Green LEDs
• 4 X Yellow LEDs
• 12 X 1000 ohm resistors
• Jumper cables
• Breadboards

4. NODEMCU(ESP 8266)
The system utilized NodeMCU
(ESP 8266 12E) equipped by
Ultrasonic obstacle sensor to
indicate the road traffic
congestion. To connect the
internet, the system uses ESP8266
12E Wi-Fi in the chip of NodeMCU.
It will send a notification to
smartphones user. It also manage
to where to give signal to clear the
traffic smartly without waste much
amount of electrical energy.

5. ULTRASONIC SENSOR
HC-SR04
The HC-SR04 ultrasonic
sensor uses sonar to
determine the distance to an
object. In addition, this
particular module comes
with ultrasonic transmitter
and receiver modules.
In this project it is used for
measure the distance
between sensor and vehicle
for clear the traffic.

6. LED:
These LED are used for
control the traffic in all
four direction.

7. RESISTOR
Resistors resist the flow of
electricity and the higher the
value of the resistor, the
more it resists and the less
electrical current will flow
through it. We are going to
use this to control how
much electricity flows
through the LED and
therefore how brightly it
shines.

8. JUMPER WIRES
Jumper wires are simply
wires that have connector
pins at each end, allowing
them to be used to
connect two points to
each other without
soldering. Jumper wires
are typically used
with breadboards and
other prototyping tools in
order to make it easy to
change a circuit as
needed.

9. BREADBOARD
Breadboard is a way of
constructing
electronics without
having to use a
soldering iron.
Components are
pushed into the sockets
on the breadboard and
then extra 'jumper'
wires are used to make
connections.

10. CONNECTION OF ULTRASONIC WITH NODEMCU(ESP8266)

11. Connection of
led, resistor
with
nodemcu(ESP
8266)

12. CIRCUIT DIAGRAM OF SMART TRAFFIC LIGHT WITH
NODEMCU

13. WORKING OF THE SMART TRAFFIC LIGHT