Police lighting
The circuit that switches between red and blue lights to simulate police lights using the ESP8266 controller and the PNP transistor 2N2222 can be described as follows:
ESP8266: Acts as the main controller in the circuit. It can be used to control the light state (red or blue) and send control signals to the transistor.
PNP Transistor 2N2222: Used to control the current flow to the LEDs. The transistor acts as a switch to control the on/off state of the current by controlling the base current (small current) using a signal from the ESP8266.
Red and Blue LEDs: Used to simulate police lights. The red and blue LEDs can be connected in the same circuit, and the current is switched between them using the transistor.
Resistors: Resistors are used to control the base current of the transistor and ensure its proper operation.
Power Source: A suitable power source should be provided to power the circuit, supply the LEDs and ESP8266.
#define LEDb D1
#define LEDb2 D2
#define LEDr D5
#define LEDr2 D6
#define d 75
void setup() {
pinMode(LEDb, OUTPUT);
pinMode(LEDb2, OUTPUT);
pinMode(LEDr, OUTPUT);
pinMode(LEDr2, OUTPUT);
}
void loop() {
digitalWrite(LEDb, HIGH);
digitalWrite(LEDb2, HIGH);
delay(d);
digitalWrite(LEDb, LOW);
digitalWrite(LEDb2, LOW);
delay(d);
digitalWrite(LEDb, HIGH);
digitalWrite(LEDb2, HIGH);
delay(d);
digitalWrite(LEDb, LOW);
digitalWrite(LEDb2, LOW);
delay(d);
digitalWrite(LEDr2, HIGH);
digitalWrite(LEDr, HIGH);
delay(d);
digitalWrite(LEDr2, LOW);
digitalWrite(LEDr, LOW);
delay(d);
digitalWrite(LEDr2, HIGH);
digitalWrite(LEDr, HIGH);
delay(d);
digitalWrite(LEDr2, LOW);
digitalWrite(LEDr, LOW);
delay(d);
}
Police lighting
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