The HG7881 is a motor driver module that provides bi-directional control for two DC motors at a maximum voltage of 12V and a current of 0.8A per channel. It can control the speed and direction of each motor independently, using PWM signals. The module can be controlled by a microcontroller, and it has built-in protection features such as overcurrent protection and thermal shutdown. It is commonly used in robotics, automation, and other projects that require motor control.

 

Package Includes:

• 1 x Motor Driver Module 2ch 0.8 12V HG7881- L9110S

 

Features:

1. Two-channel motor control: The HG7881 can control two DC motors independently, providing bi-directional control for each motor.
2. The maximum voltage of 12V: The module can handle a maximum voltage of 12V, which is suitable for small to medium-sized motors.
3. The current limit of 0.8A per channel: The module can handle a maximum current of 0.8A per channel, which is suitable for small to medium-sized motors.
4. Pulse Width Modulation (PWM) control: The module uses PWM to control the speed of each motor, allowing for varying speeds.
5. Independent motor direction control: The module allows for independent control of the direction of each motor, so both motors can be run in forward or reverse directions.
6. Input pins for control: The module can be controlled by a microcontroller through its input pins, which include pins for controlling the direction and speed of each motor.
7. Built-in protection features: The HG7881 has built-in overcurrent protection and thermal shutdown features to prevent damage to the module and the connected motors.
8. Easy to use: The module is easy to use and can be integrated into various projects that require motor control, such as robotics and automation.

 

Description:

The HG7881 is a two-channel motor driver module that provides bi-directional control for two DC motors. It can handle a maximum voltage of 12V and a current of 0.8A per channel, which is suitable for small to medium-sized motors. The module uses pulse width modulation (PWM) to control the speed of each motor, which means that the motors can be run at varying speeds. It also allows for independent control of the direction of each motor, so both motors can be run in forward or reverse directions. The module can be controlled by a microcontroller, such as an Arduino or Raspberry Pi, through its input pins. It has two sets of input pins, one for each motor channel, which includes pins for controlling the direction and speed of each motor. In addition, the HG7881 has built-in protection features such as overcurrent protection and thermal shutdown, which help to prevent damage to the module and the connected motors. The overcurrent protection kicks in if the current drawn by the motor exceeds the maximum current limit, while the thermal shutdown is triggered when the temperature of the module reaches a certain level.

 

Principle of Work:

The HG7881 motor driver module works based on the H-bridge configuration, which allows it to provide bi-directional control for two DC motors. Each channel of the module consists of four transistors (two NPN and two PNP) that are arranged in an H-bridge configuration. The transistors are used to switch the direction of the current flowing through the motor, which allows for bi-directional control. The speed of the motor is controlled using Pulse Width Modulation (PWM) signals. The PWM signal is applied to the input pins of the module, which then controls the ON/OFF time of the transistors in the H-bridge. This results in a varying voltage that is applied to the motor, which in turn controls the speed of the motor. The module also includes built-in protection features such as overcurrent protection and thermal shutdown. The overcurrent protection feature monitors the current flowing through the motor and triggers a shutdown if the current exceeds the maximum limit. The thermal shutdown feature monitors the temperature of the module and shuts down if the temperature exceeds a certain level. These protection features help to prevent damage to the module and the connected motors.

 

Pinout of the Module:

Pin	Function	Description
VCC	Power Supply	Powers the module. Requires 2.5V to 12V DC input voltage.
GND	Ground	Connected to the ground of the power supply.
Input 1A	Motor 1 Direction Control	Controls the direction of motor 1. Logic high for one direction, logic low for the opposite direction.
Input 1B	Motor 1 Speed Control	Controls the speed of motor 1. PWM signal applied to adjust speed.
Input 2A	Motor 2 Direction Control	Controls the direction of motor 2. Logic high for one direction, logic low for the opposite direction.
Input 2B	Motor 2 Speed Control	Controls the speed of motor 2. PWM signal applied to adjust speed.
Out A 1-2	Output for Motor 1	Output pin for motor 1.
Out B 1-2	Output for Motor 2	Output pin for motor 2.

 

Applications: 

1. Robotics: The HG7881 motor driver module can be used in robotics applications to control the movement of robot arms, wheels, and other components.
2. Automation: The module can be used in automation applications to control the movement of conveyor belts, robotic arms, and other machinery.
3. Remote control cars and drones: The module can be used in remote control cars and drones to control the speed and direction of the motors that drive the wheels or propellers.
4. Motorized blinds and curtains: The module can be used in motorized blinds and curtains to control the opening and closing of the blinds or curtains.
5. Fans and ventilation systems: The module can be used in fans and ventilation systems to control the speed of the motor that drives the fan or ventilation system.
6. DIY projects: The module can be used in various DIY projects that require control of DC motors, such as motorized camera sliders, motorized gates, and more.

 

Circuit:

 

• Connect the positive wire of the motor to the motor "A" connector on the left of the HG7881 module and the negative wire to the connector on the right.
• Connect a power supply with a voltage range between 3 to 12V DC depending on the motor you use to the VCC and GND pins of the module.
• Connect the ground pin of the power supply to the GND pin of the module.
• Connect any two digital output pins on the Arduino board to the A1A and A1B pins on the HG7881 module for direction control we will use 2 and 3.
• If the motor spins in the opposite direction of what you wanted, change the wire connection of the motor to the A connector.

 

Library:

No Library Needed

 

Code:  

This code allows controlling the motor direction using the Serial Monitor:

These are the commands that can be sent through the Serial Monitor to control the motor direction:

• Send 'f' to turn the motor in the forward direction.
• Send 'r' to turn the motor in the reverse direction.
• Send any other character to stop the motor.

const int A1A = 3;
const int A1B = 2;

void setup() {
  pinMode(A1A, OUTPUT);
  pinMode(A1B, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
    char command = Serial.read();
    if (command == 'f') {
      digitalWrite(A1A, HIGH);
      digitalWrite(A1B, LOW);
    } else if (command == 'r') {
      digitalWrite(A1A, LOW);
      digitalWrite(A1B, HIGH);
    } else {
      digitalWrite(A1A, LOW);
      digitalWrite(A1B, LOW);
    }
  }
}




 

Technical Details:

• Low standby current: less than 1mA
• Control interface: 2 logic-level inputs per channel
• Reverse voltage protection
• Over-temperature protection
• Input voltage: 2.5-12V DC
• Each channel has a continuous output current of 800 ma
• PCB Size: 29.2mm x 23mm

 

Resources:

• Tutorial

 

Comparisons:

Both the HG7881-L9110S and the L293D are popular motor driver modules, each with its own set of characteristics:

1. Operating Voltage Range:

   • The HG7881-L9110S operates within a voltage range of 2.5V to 12V DC, offering flexibility for low to moderate-voltage applications.
   • In contrast, the L293D boasts a wider operating voltage range of 4.5V to 36V DC, making it suitable for a broader range of voltage requirements.

2. Maximum Output Current:

   • The HG7881-L9110S can provide up to 0.8A of continuous output current per channel, catering to moderate power demands.
   • On the other hand, the L293D is capable of delivering up to 0.6A of continuous output current per channel.

3. Control Interface:

   • Operating the HG7881-L9110S requires only 2 logic-level inputs per channel, simplifying the control process.
   • Conversely, the L293D demands 3 inputs per channel for effective operation.

4. Chip Architecture:

   • Utilizing a dual H-bridge architecture, the HG7881-L9110S provides efficient motor control capabilities.
   • In contrast, the L293D employs a quad H-bridge architecture, offering enhanced versatility and potential for more complex motor control tasks.

5. Standby Current:

   • The HG7881-L9110S features a remarkably low standby current of less than 1mA, minimizing power consumption during idle periods.
   • However, the L293D exhibits a higher standby current of 16mA.

The choice between the HG7881-L9110S and the L293D hinges on your specific application and motor requirements. If you're dealing with high-voltage setups, the L293D might be more suitable. Conversely, for low-voltage and low-power applications, the HG7881-L9110S could be the preferred option.