Anything less than that would result in your Arduino not functioning properly and auto-resetting. The minimum voltage you can apply to your Arduino is 6V. What’s The Minimum Voltage Arduino Can Take? That may seem like a good thing, but doing so can cause damage to your motor, such as overheating, damage to the bearing, etc. You can go over 9V, but you should understand that if you apply twice as much power than a DC motor usually takes, it will spin 2 times faster and use twice as much current. If you want to learn the in’s and out’s of these sources (like the 9V battery I’ve mentioned), go check out my Arduino alternate power source guide. I’ve written a great article on alternate power sources you can use besides plugging your Arduino into your computer via the USB (Universal Serial Bus) cable. You can do so by connecting a 9V battery to a battery snap and inserting it into the breadboard. Typically, you can supply your DC motor with 9V. Without these extra volts, the DC motor will steal volts from your Arduino, causing it to auto-reset because its power supply isn’t consistent. For instance, if you use a DC (direct current) motor, you’ll need to use additional volts. Still, there are some instances where a large power supply can be justified. That’s similar to pouring water and overfilling, which causes the excess water to spill out from the top. However, I would recommend the maximum voltage to be 12V based on my personal experience and other Arduino user’s advice. The maximum voltage an Arduino can take is 20V according to the Arduino company themselves. What’s The Maximum Voltage Arduino Can Take? The rest of this article will focus on why there are restrictions and the maximum and minimum voltage the Arduino can use in order to function properly and without any damages. This is necessary to prevent your Arduino board from overheating and getting fried. However, you’ll need to supply the power through the Vin (voltage in) pin on the Arduino board instead of the 5V pin. The Arduino can definitely run on 12 volts. Now that some people have graduated from solely relying on the USB cable, they may be wondering: It was a great 2 for 1 deal: we could upload our sketches to the board in addition to powering it. For us, it was as simple as grabbing a USB cable, connecting one end to the Arduino’s USB port, and the other end to our computer’s USB port. When the USB gets disconnected while the USB and the external power supply is both connected, the board immediately turns off.For many beginners, including me when I first began, we didn’t give a second thought about the amount of volts we needed to supply to our Arduino. 3 that it is in fact just pulled from the USB power line, so it does not mean that the internal transformer circuitry is alright. The 5V pin says quite 5V, but I see from the schematic of Uno Rev. However, when the USB is connected, the board works alright, regardless of whether external power supply is connected. The 5V pin, when connected to GND through a 1K ohm resistor, says about 50 mV. I tried to measure the current it consumes, but the value from the multimeter changes when I switch the measure range - I suppose this is because the current is so small that the so-small resistance of the multimeter affects the current. One thing, I had a jumper wire connected to the 5V, and it might have accidentally got shorted with GND while poking around.Ĭurrently, the Arduino won't start up when given external power supply soley, be it a 2.1mm plug or VIN pin. I checked all the voltage differences and amount of current around the BJT with my multimeter, and I made sure nothing ever exceeds the maximum rating. A single digital output was connected to a base of a BJT, which was being used as a switch. It was connected to a external 12V power supply on the 2.1mm plug. First of all, my Arduino Uno R3 isn't genuine.Īt some moment when I was playing with it, the Arduino stopped working.
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