Use Arduino to generate PWM signals and control ESC to realize the forward and backward of the motor.

Controlling a bidirectional Electronic Speed Controller (ESC) using PWM signals typically involves sending specific PWM values to control the motor's speed and direction. Below is a simple example control code using an Arduino to generate PWM signals and control a bidirectional ESC. Please make sure your bidirectional ESC is connected to the Arduino's PWM pins and powered correctly.

#include <Servo.h>

Servo esc; // Create a Servo object

void setup() {
esc.attach(9); // Attach the ESC to pin 9 on the Arduino
esc.writeMicroseconds(1500); // Initialize the motor to a neutral position
delay(2000); // Wait for 2 seconds
}

void loop() {
int throttle = 1500; // Neutral position, motor is not spinning
esc.writeMicroseconds(throttle); // Send PWM signal to control the motor

// Delay for a certain period of time
delay(1000);

// Accelerate the motor by increasing the PWM signal
throttle = 1600;
esc.writeMicroseconds(throttle);

// Delay for a certain period of time
delay(1000);

// Decelerate the motor by decreasing the PWM signal
throttle = 1400;
esc.writeMicroseconds(throttle);

// Delay for a certain period of time
delay(1000);
}

In this example, we use the Arduino's Servo library to generate PWM signals and send them to the ESC. First, we attach the ESC to pin 9 of the Arduino and set the initial PWM value to 1500 microseconds, which is typically the neutral position for the motor.

Then, we enter the loop() function, where we can control the motor's operation. We control the PWM signal's pulse width by changing the throttle variable to adjust the motor's speed. In the example, we demonstrate accelerating and decelerating the motor.

Please note that the actual PWM signal range and neutral position may vary depending on the ESC model, so you may need to fine-tune it according to your ESC specifications. Additionally, this is a simple example, and you can write more complex control code to meet your specific application requirements. Make sure to operate according to the specifications of your ESC and motor.