Controlling Speed of a motor | Pulse Width Modulation on ESP 8266 | L298N motor driver

 Pulse Width Modulation PWM on ESP8266

In this tutorial we will learn about pulse width modulation (PWM). PWM is used to turn on and off a device at a rapid pace to stimulate decrease voltage and reduce power intake. In this case, we will drive a motor at reduce speeds. The width of the pulse will determine the amount of time the power needs to be on for the device. Hence the name Pulse Width Modulation.


Components Needed
1. BO motor and wheel
2. NodeMCU
3. Power supply to power L298N motor driver
4. Potentiometer 10K
5. Jumper wires


Connections

Power Module        L298N Driver        ESP        Potentiometer        BO Motor
        12V                        12V    
        Gnd                        Gnd                Gnd                Gnd
        5V                                                 Vin
        3.3V                                                                     Vcc
                                                              A0              Middle pin   
                                        En1                D5
                                   M1 and M2                                                        + and -ve terminal

We will use D5 pin to generate pulse width modulated signal connected to Enable pin of L298N driver. 
In this IN1 and IN2 of the motor diver are connected to 5V and Gnd respectively.

Code

int sensorPin = A0; 
int value = 0;

void setup() {
}

void loop() {
  value = analogRead(sensorPin);
  delay(10);
  analogWrite(D5, value/4 - 1);    
}

When you move the potentiometer, ESP will read the value and convert it to digital 
unit to be used to set duty cycle at D5 pin.





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