Max mA on 5V pin using USB power?

Projects General Guidance
1

I've searched around for this information but wasn't able to get a definitive answer.

What is the max mA draw on the 5V pin when powered via USB?

I am powering an Arduino UNO R3 via USB, and I want to power both a Bluetooth module and a line tracking module off the 5V pin. The two modules draw a peak of 55mA. From what I've been able to find, when powered by USB the 5V pin is only limited by the 500mA limit for the Arduino board, therefore the 55mA peak draw from my modules should be fine.

Any chance someone could give me a definite answer on this?

2

What is the max MA draw on the 5V pin when powered via USB?

A USB port can supply up to 500mA. Subtract the current being drawn by the Arduino and devices being powered by the Arduino like LEDs and what is left you can take from the 5V pin.

The two modules draw a peak of 55MA.

I think this is closer to 55mA not Mega amps.

3

I think you mean mA as in milliamps.
1 mA = 1/1000 of 1 amp

4

HAH! Yes, sorry about that. The dangers of posting before coffee. :blush: