🔋 Power System and Batteries

🎯 Lesson Objective

In this lesson, students will understand:

• Why a power system is important in robotics
• The types of batteries used in robotics projects
• How batteries supply power to electronic components
• Safe ways to connect and manage power in a robotics system
• How power is distributed to different components in a robot

This lesson introduces the power system that provides energy to run all components in a robot.

1️⃣ Why a Power System is Important

Every electronic system requires a power source to operate.

In robotics systems, the power system supplies electrical energy to components such as:

🧠 Microcontroller (ESP32)
⚙️ Motors
🔎 Sensors
📡 Communication modules
💡 LEDs and other electronics

Without a power supply, none of these components would function.

A well-designed power system ensures that the robot operates reliably and safely.

2️⃣ Types of Power Sources Used in Robotics

Robotics systems commonly use batteries as the primary power source.

Batteries provide portable energy that allows robots to operate without being connected to a wall outlet.

Some commonly used battery types include:

🔋 Lithium-ion Batteries (18650)

These rechargeable batteries are widely used in robotics because they provide:

• High energy capacity
• Stable voltage output
• Rechargeability

They are commonly used in portable electronics and robotics systems.

🔋 Lithium Polymer (LiPo) Batteries

LiPo batteries provide high current output and are commonly used in drones and advanced robotics.

However, they require careful handling and proper charging circuits.

🔋 AA Battery Packs

AA battery holders are often used in beginner robotics projects.

They are easy to replace and widely available, though they may provide lower power compared to lithium batteries.

3️⃣ Battery Voltage and Robotics Systems

Different components in a robot may require different voltage levels.

For example:

• ESP32 typically operates at 3.3V logic level
• Some sensors operate at 3.3V or 5V
• DC motors may require 6V to 12V

Because of these differences, the power system must provide appropriate voltage levels for each component.

In many robotics projects, voltage regulators or step-down modules are used to convert battery voltage into safe levels.

4️⃣ Power Distribution in a Robot

In a robotics system, power from the battery is distributed to multiple components.

The typical power flow works as follows:

1️⃣ Battery supplies electrical energy.
2️⃣ Power is distributed to the motor driver module.
3️⃣ The motor driver powers the motors.
4️⃣ The microcontroller receives regulated power.
5️⃣ Sensors receive low-voltage power from the microcontroller.

This structured distribution ensures that every component receives the correct amount of power.

5️⃣ Battery Safety Guidelines

Since batteries store electrical energy, it is important to handle them carefully.

When working with batteries, follow these safety practices:

⚠ Always connect batteries with the correct polarity.
⚠ Avoid short-circuiting battery terminals.
⚠ Use proper battery holders or connectors.
⚠ Turn off the power when modifying circuits.

Improper battery connections can damage electronic components or cause overheating.

6️⃣ Charging Lithium Batteries

Rechargeable batteries such as 18650 lithium batteries require special charging circuits.

A common charging module used in robotics projects is the TP4056 charging module.

This module provides:

🔋 Safe battery charging
⚡ Overcharge protection
🛡 Battery protection features

Using a proper charging circuit ensures that batteries remain safe and last longer.

7️⃣ Power System in This Course

In this course, the robotics projects will typically use:

🔋 Rechargeable lithium batteries (18650)
🔌 Battery holders
⚙️ Voltage regulation modules when required

These components will provide sufficient power for:

• ESP32 microcontroller
• Sensors
• Motor driver modules
• DC motors

A proper power system ensures that the robot operates smoothly and reliably.

🚀 What Happens Next

Now that you understand how batteries and power systems provide energy to robotics systems, the next step is to learn how components are connected together in circuits.