Otherwise, the dips in power may cause the microprocessor to reset, not provide enough torque from your motor, or your LEDs may not fully light up. If your circuit includes elements that require massive amounts of current, like motors or large amounts of LEDs, you may need a large supply or even separate supplies for the microprocessor and the extra motors. It's also better practice to round up and assume your circuit will need more current than to not provide enough current. This is also known as a brown-out.Īs with voltage, it's recommended to check the datasheets and estimate what the different bits and pieces of the circuit might need. If your power supply cannot give you the amount of juice the project needs, the circuit may start acting in a strange, unpredictable way. This question also depends on the development board and microprocessor you're using as well as what circuits you plan on connecting to it. How Much Current Do I Need for Project X? However, to verify what voltages are safe, it is recommended that you check the datasheet for the voltage regulator on the development board to see what voltage range is recommended by the manufacturer. Here at SparkFun, we use 9V power supplies for many of our products that operate in the 3.3V to 5V range. The power comes from a power supply and is then regulated closely by a voltage regulator so that each chip is powered at a consistent voltage even when the current draw may fluctuate at different times. A lot of microprocessors and IC's on development boards run at 3.3V or 5V but have voltage regulators that can handle anywhere from 6V to 12V. This allows us to supply a voltage in a specified range above the regulated voltage. However, most microprocessor development boards like the Arduino Uno have a voltage regulator on board. This depends largely on the circuit, so there is no easy answer to this question. Voltage/Current Considerations How Much Voltage Do I Need for Project X?
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