Can You Connect a 12V Battery to an Arduino Board?

Published on: October 9, 2022
Written by Jonas Frank / Fact-checked by Nova Scarlett

Yes, you can connect a 12V battery to an Arduino board. The voltage from the battery will be regulated by the onboard voltage regulator and used to power the microcontroller and other components. You can use a 12V battery to power your Arduino board in two ways: directly connecting it to the VIN pin or using a DC power jack.

can you connect a 12v battery to an arduino board
  • Connect the positive lead of the battery to the +5V pin on the Arduino board;
  • Connect the negative lead of the battery to one of the ground pins on the Arduino board;
  • Connect a 10kohm resistor between the positive lead of the battery and digital pin 8 on the Arduino board;
  • Connect a 1N4001 diode between digital pin 8 on the Arduino board and the ground, with the cathode (the banded end) connected to the ground.

Can We Connect a 12V Battery to Arduino?

Yes, you can connect a 12V battery to an Arduino. To do so, you’ll need to use a voltage regulator to convert the 12V from the battery into 5V, which is what the Arduino needs. You can then connect the power output of the voltage regulator to the power input on the Arduino.

Can I Use a 12V Power Supply on an Arduino?

Arduino boards are designed to be powered by either external 5V power supplies or USB power. The recommended external power supply for most Arduino boards is 7-12V. However, some Arduino boards can be powered with a lower voltage, such as the Arduino Nano which can be powered with an external power supply as low as 3.3V.

In addition, some Arduino boards, such as the Arduino Mega, can be powered with an external power supply of up to 20V. If you try to connect a 12V power supply to an Arduino board that is not designed to be powered by a 12V power supply, you could damage the board. For example, if you connect a 12V power supply to an Arduino Nano, the onboard voltage regulator will overheat and damage the board.

Therefore, it is important to check the specifications of your particular Arduino board before connecting it to a higher-voltage power supply.

Can I Connect 12V to Arduino Uno?

You can absolutely connect a 12V power supply to your Arduino Uno, but there are a few things you need to keep in mind.

First of all, the voltage regulator on the Uno is only rated for up to 9V so you’ll want to make sure that your 12V power supply is regulated.

Secondly, the maximum current draw for the Uno is 500mA so you’ll need to make sure your power supply can provide at least that much current.

Lastly, when connecting anything directly to the Vcc or ground pins on the Arduino you should take care not to exceed the absolute maximum voltage rating for those pins, which is 6V. With all that said, it’s perfectly safe and acceptable to connect a 12V power supply to your Arduino Uno as long as you take proper precautions.

How to Connect 12V Power Supply to Arduino?

Arduino is a popular open-source electronics platform based on easy-to-use hardware and software. It’s intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments. One of the most common questions we get asked is how to connect a 12V power supply to an Arduino board.

While the Arduino Uno has a built-in 5V regulator that can be used to power the board, some applications require higher voltages. In this blog post, we’ll show you how to connect a 12V power supply to an Arduino board safely and efficiently.

The first thing you need to do is purchase a 12V power supply. We recommend using a regulated DC power supply with an output of 12 volts and at least 1 amp of current. You can find these online or at your local electronics store. Once you have your power supply, connect it to the Arduino board as shown in the diagram below.

Next, connect the positive (red) lead from the power supply to the Vin pin on the Arduino board. Then, connect the negative (black) lead from the power supply to one of the GND pins on the Arduino board.

Finally, plug in your USB cable and turn on your computer.

Your Arduino should now be powered by your 12V power supply!

Arduino Uno 12V Power Supply

Arduino Uno 12V Power Supply A lot of people ask about powering the Arduino Uno from a 12V power supply. The Arduino Uno can be powered from either a USB connection or an external power source.

If you want to use an external power source, you will need to connect it to the “RAW” pin on the Arduino Uno. Connecting an external power source to any other pin will not work. When using an external power source, it is important to make sure that the voltage does not exceed 12V.

Applying more than 12V to the RAW pin can damage your Arduino Uno. If you’re not sure what voltage your power supply is putting out, you can use a multimeter to check it before connecting it to your Arduino Uno. It is also important to note that when using an external power source, the onboard regulator on the Arduino Uno will no longer be used.

This means that if your external power supply is less than 7V, the 5V pin on the Arduino Uno will no longer output 5V.

Arduino Portable Power Supply

If you’re into electronics, chances are you’ve heard of Arduino. Arduino is an open-source electronics platform based on easy-to-use hardware and software. It’s a great way to get started with electronics because it’s very user-friendly.

One of the best things about Arduino is that it’s portable, which means you can take your projects with you wherever you go. However, one downside to Arduino is that it requires a power source. This can be problematic if you’re trying to use your Arduino in a remote location or if you’re trying to save battery life.

That’s where a portable power supply comes in handy. A portable power supply gives you the ability to power your Arduino without being tethered to a wall outlet or computer USB port. There are a few different types of portable power supplies that work well with Arduino.

The most popular type is the lithium-ion battery pack. These packs come in various sizes and capacities, so you can choose one that fits your needs. Lithium-ion batteries are lightweight and rechargeable, making them ideal for powering devices like Arduino.

Another option is the lead acid battery pack, which is heavier but provides more power than lithium-ion batteries. Lead acid batteries are not as popular as lithium-ion batteries because they’re not as lightweight or as easily recharged; however, they may be a better choice for high-power applications like motors or lights. When choosing a portable power supply for your Arduino project, make sure to select one that has enough capacity to run your project for the amount of time you need it to run without needing to be recharged or replaced too often.

How to Power Arduino Nano With Battery?

Assuming you would like a blog post discussing how to power an Arduino Nano with a battery: The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (polyfuse protected), or 5V regulated external power supply. The power source is selected automatically.

If using an external power supply, you can connect it through the barrel jack or Vin pin. The board can be supplied with power either from the DC power jack (7 – 12V), the USB connector (5V), or the VIN pin (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board.

We don’t recommend it. You should never connect both at once as this will cause a short circuit and could damage your board. If you have an external power supply and want to also be able to program your Arduino over USB you’ll need to disconnect the external power supply while you’re programming it.

External (Non-USB) Power Supply Connections

The Arduino Nano has a slot for connecting an External Power Supply (EPS). You must use an EPS that provides regulated +5VDC because supplying voltage directly to the +5VDC or IOREF pins bypasses the onboard voltage regulator which could damage your board.

Also, do not try to measure voltages greater than 40 Volts DC on any of these pins as this will also damage your board! If using more than 12 Volts DC on the Vin pin, please see our information about Using Voltage Regulators for guidance about how to select and properly connect a voltage regulator so that you don’t damage your ArduinoNano. Please note that if you are powering from batteries with a high discharge rate(e.g. 9 volts alkaline battery), there can be significant line drop across the main terminals so please make sure that you have sufficient headroom for this possibility when designing systems powered by batteries only.

Connecting Your Battery

There are many different ways to connect batteries depending on their type and capacity but we’ll just discuss two of the most common ways here. For more detailed instructions please consult our battery Chemistry Tutorial which goes into much greater detail about each type of battery and how best to work with them.

Can I Ground 12V to Arduino?

Yes, you can ground 12V to Arduino. This is because the Arduino has an onboard voltage regulator that will protect it from any overvoltage. However, if you are going to be using this circuit with higher voltages, it is always a good idea to add an external voltage regulator for extra protection.

Can You Power Arduino Nano With 12V?

Yes, you can power the Arduino Nano with a 12V power source. The voltage regulator on the board will convert the 12V to the 5V needed by the Arduino Nano. You can also use a 9V or 6V power source, but using a 12V power source will allow you to run your projects at higher voltages and currents.

Can You Power Arduino With a 9V Battery?

Sure! You can power Arduino with a 9V battery. All you need is a 9V battery and an adapter that will convert the 9V into the 5V that Arduino needs.

What Battery to Use for Arduino?

Arduino is an open-source electronics platform based on easy-to-use hardware and software. It’s intended for anyone making interactive projects. The heart of every Arduino board is an Atmel AVR microcontroller.

These chips are powerfully little computers that can be programmed to do just about anything, from blinking LEDs to reading sensors and controlling motors. When it comes to power, the Arduino Uno and Mega use an external power supply, while the Leonardo, Micro, and Nano use a USB connection. The Arduino Pro series uses an external power supply as well.

All these boards have either a DC power jack or a USB connector so they can be powered by batteries, wall adapters (aka AC/DC adapters), solar panels, etc. We generally recommend using NiMH or LiPo batteries for powering your quadcopter & Arduino projects because they’re inexpensive and easy to find. But there are other options out there if you’re looking for something different.

How to Power an Arduino Without a Computer?

If you’re looking to power your Arduino without a computer, there are a few different ways that you can do so. One popular method is to use a 9V battery. This will provide enough power for most small projects.

Another option is to use a AA or AAA battery pack. This can be a good choice if you’re looking for something with a bit more power than a 9V battery. Finally, you can also use a USB power source, such as a phone charger or laptop USB port.

Whichever method you choose, make sure that the voltage of the power source is within the range that the Arduino can handle (5-12V).


It is possible to connect a 12V battery to an Arduino board. However, it is important to take precautions when doing so, as connecting the wrong way could damage the board. When connecting the battery, make sure to connect the positive lead to the positive terminal on the Arduino and the negative lead to the ground.

It is also a good idea to use a voltage regulator in between the battery and Arduino to protect the board from high voltages.

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