How much is the maximum outputs that can be attached to an Arduino ?

Question

For my robot I need to have 3 relay modules , 5 ultrasonic distance sensors , radio transmitting 433mhz module and a piezo buzzer . So is the current outputted by the arduino enough to operate those ? and if its required to add an external output input how to add ?

balearicdynamics · Answer

Hello, you should be more precise than listing the components. First of all you should see what is the average current supported by the Arduino, that will not be higher than 500 ma supposing you connect it to the USB port. Anyway you can find these specifications on the hardware details board. But you have not specified what Arduino you are using, mini, uno, tre, duemilanove ??? One version operating at 5V or 3.3? Just to speak of the microcontroller side. Then you should download if not yet have the datasheet of the exact components you plan to have. For sure on the datasheet one of the essential informations reported for every component is the current consumption. Then when you have a clear scenario of the power you need and the power you can provide it is possible to take a decision if the external components should be powered independently or not. Better if you also notice these things and explain us what do you have in mind. As much things you explain as easy someone can help you in the right way, give good suggestions, advices etc. Enrico

Former Member · Answer

Hello , I am using Arduino Uno Jose