7/1/2023 0 Comments Power of ten for nano![]() ![]() Absolute voltage limits for powering the Arduino: 6~20V.These input voltages can be sustained indefinitely.Recommended input voltage limits: 7~12V.When powering the Arduino via the power jack or VIN and GND pins, it has the following input voltage limitations: Input power: to power the Arduino, you either plug it in to a USB port, or you input a voltage source to it either its 2.1mm x 5.5mm DC power jack (if present, such as on the Uno) or via jumpers going to its "VIN" and "GND" pins (which are on all Arduinos that I've seen).Power Limitations of the Arduino Uno & Nano: Read my article here for more info: Quick Tip: Arduino Input/Output (I/O) Pin Over-Voltage Protection Using a *Single* Resistor! A 100k resistor allows DC input voltages from -100.5V to +105.5V. Ex: a 10k resistor provides voltage enough protection to allow input voltages between -10.5V and +15.5V. Note 1: simply by adding a resistor in series with an I/O pin, you get increased input voltage protection for that pin. Sum of all input/output pins combined (but NOT including the "5V" pin): 200mA.5V pin: same as above: 500mA or 500mA~1A. ![]() With external battery or power supply: total of 500mA~1A (see below for specifics).Input/Output (I/O) pins: -0.5V to +5.5V (the actual max is "Vcc + 0.5V," which for a 5V Arduino, is +5.5V) ( Note 1).References will be included at the end, and references for particular data are denoted by square braces with the reference number, such as this: "." Following my references and methodology, you can use the same techniques to figure out the limits of your particular board, in case you're not using an Uno or Nano. Here, I will attempt to succinctly and accurately describe the power limitations of the standard Arduino boards, such as the Uno and Nano. In either case, it's important to understand the limitations of your Arduino, its input/output pins, and its voltage regulators. Larger servos and motors like these have the potential to push the Arduino past its max current limits, potentially causing it to reset itself and cause unusual errors while running, or possibly even damage the Arduino (I should note that most linear voltage regulators have an over-temperature auto-cutoff feature, however, so damage is unlikely). In using Arduino and designing my circuits for it, I have often-times asked myself the question, "What are the power/current/voltage limitations of the Arduino?" "Will I risk damaging it?" In the image above, for instance, a large servo is being powered by the voltage regulator right on the Arduino development board. (image above is from this Adafruit tutorial here)
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