How Much Current Can an Arduino Supply?

How Much Current Can an Arduino Supply?

An Arduino can supply a limited amount of current. This is an important consideration when designing projects, as you need to make sure that the total current draw does not exceed the maximum rating of the Arduino board. In this article, we will discuss how much current an Arduino can supply and provide some tips on how to stay within its limits.

What is an Arduino

An Arduino is a microcontroller board based on open-source hardware and software.

It was developed by a team of engineers and designers led by Massimo Banzi in Italy back in 2005. It has become one of the most popular boards for makers, hobbyists, and students who want to build their own projects.

The projects you can build with Arduino range from the simple to complex. You can program it to control lights and motors, build robots, create interactive art projects, and more.

What is an Arduino

The board includes several components like an ATmega328P microcontroller and various other pins that can be used to connect to external devices and sensors. This allows the user to program the board with different instructions that will control how the device works and respond to certain inputs.

Arduino Power Requirements

The power requirements of an Arduino depend on what type of board you are using. The boards generally require a power supply of 5V to 12V, depending on the model and its usage. The voltage supplied to the Arduino should be regulated so that it remains within these limits for reliable operation.

If too much voltage is supplied, the board can become damaged or even destroyed.

Every Arduino board has pins that can accept power from a variety of sources, including batteries, DC wall adapters and even solar cells. When connecting an external power source to an Arduino, it is important to make sure that the voltage supplied is not too low or too high.

The ATmega328P microcontroller on the board has a maximum output current rating of 40mA per pin, although this can be exceeded with external devices like motors. However, this is the absolute maximum current that can be drawn from the pins; exceeding this limit can cause damage to the board.

In fact, we don’t suggest you draw 40mA per pin for normal operation.

To avoid damage to the board, it is best to stay within the recommended 20mA per pin limit. 40mA is only the maximum current that the pins can take before damage occurs – but it doesn’t guarantee your pin won’t be damaged at this number.

The total amount of current an Arduino can supply across all pins is maxed at 200mA. This is usually sufficient for most projects but if you are using multiple components or devices then it can become an issue.

Arduino Power Requirements

However things can get even more complex here, because the 5V pin on an arduino is quite different from the rest of the pins, as it has a much higher current rating. This is because the pin isn’t connected through a microcontroller and can have higher currents. The exact amount depends on how you power the board (through USB or wall adapter).

USB cables are the most common option for powering an Arduino because they’re easy to use and available everywhere. However, the exact current rating of a USB cable can vary widely. Generally, you can expect your 5V pin to consume around 500mA from standard USB cables. The limit is set by the USB interface, so if you plan on using higher currents, then you will need to use an external power source.

An external power supply is considered to be the most reliable way of powering an Arduino. You can use wall adapters, batteries or even solar cells to power your board. The voltage supplied should always stay within the 5V-12V range and it is important to note that the power source used must be able to provide sufficient current for the components being used on the board.

With an external power supply, a 5V pin on an Arduino can consume up to 1A of current. Again, it should also be noted that each pin can still only supply up to 40mA, so it is important to consider this when connecting multiple components or devices.

The 3.3V pin is also a separate story, as it has its own current rating, which is set at 150mA. It is important to remember this when connecting components or devices that require 3.3V to operate. Being a regulator pin, this current rating should never be exceeded.

Knowing all this information, it’s possible to figure out how much current your Arduino board will be able to supply for any given project. As a general rule of thumb, always make sure that the power source you are using can provide enough current for your components or devices and never exceed the 40mA per pin limitation. This will ensure that your Arduino board remains safe and functioning properly.

Arduino Power Requirements

Just keep in mind that the above information can only be applied to Arduino models that use a ATmega328 microcontroller. Other models may have different current ratings and limitations, so it is important to consult the documentation of your specific model before connecting any components or devices. [1], [2], [3]


Can Arduino Uno take 12 volts?

The Arduino Uno board can work on an external supply of between 6-20 volts. However, it is not recommended to supply the board with more than 12 volts or less than 9 volts. Therefore a good middle ground is to supply the board with 12 volts.

How much current can Arduino pins supply?

The maximum current that an Arduino pin can supply depends on the model of Arduino you are using. Generally, most Arduino models have a limit of 40 mA (milliamps) per pin. As for the total current that an Arduino can supply, it depends on the model. Most Arduinos can provide around 200 mA in total.

How much current can Arduino 5V supply?

The short answer is that the Arduino Uno 5V pin can provide up to 500mA of current (more than enough for most projects). However, this should be taken as a guideline and not an absolute maximum. It is recommended you keep your current draw well below this figure to maintain stability and avoid damaging the board.

When Arduino is powered with USB, the 5V pin will generally be supplied with around 500mA. If you need more current, then you can use an external power source, such as a battery or AC adapter.

How many amps can Arduino Uno supply?

Arduino Uno is a microcontroller board based on the ATmega328P processor.

It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, and a 16 MHz crystal oscillator. The board is designed to operate at 5V voltage levels.

Theoretically, it can supply up to 40mA from each pin when operating at peak performance, however this value gradually decreases depending on how the pins are configured. For example, a regular LED will draw around 20mA while an LCD display typically draws between 50-60mA. Therefore, you should plan your Arduino project according to the amount of current it will require to function properly.

Additionally, different pins can have different current capabilities. For example, the 5V pins on an Arduino Uno can provide up to 500mA of current in total, while the 3.3V pins can only provide up to 150mA.

How much current can Arduino 3.3 V supply?

The Arduino 3.3 V pin can source up to 150 mA (milliamps) of current. This is the maximum amount of current that can be supplied by a single output pin, and it should not be exceeded for any reason. The purpose of the 3.3 V regulated pin is to provide a consistent voltage level which can be used for power supply, communication and other digital operations.

Useful Video: Tinkercad + Arduino Lesson 14: Power and Current Limits


To sum it all up, the amount of current an Arduino can supply depends on what type of power source you’re using and how many components you are connecting. Generally, an Arduino board can provide up to 40mA max for a pin before it needs additional power sources to handle the load. As for the total current, the Arduino Uno is capable of supplying up to a total of 200mA from all pins. It’s important to understand these limitations in order to prevent any damage to your board and components.

It is important to note that the Arduino board has several pins capable of providing different levels of current output, depending on the requirements of your project or device. A USB cable will limit your 5V pin to a maximum of 500mA. On other hand, an external power source used with the Vin pin will be able to provide up to 1A of current. It’s also important to keep in mind that an Arduino can only provide as much power as its regulator and pins can handle, so it’s always a good idea to check their ratings before connecting components. A 3.3V pin can provide up to 150mA of current only as it has a limited current rating.

By understanding the limits of current output on your board, you can better plan for the components needed for your project and ensure it is safe to use. Working with electricity can be dangerous, so always take safety precautions such as double-checking wiring and following manufacturer’s instructions when connecting components. Happy creating!