How to connect approximately 30 arduins to power, what should be the current and voltage?

Question

Arduino

There is a great idea. Connect 30 arduino to one power supply. How to do this, how to calculate the current power and how to connect them. As I understand it, 30 arduins will not work from one crown. How to connect, how to calculate the load) tell me
One moment, you need to connect them through a two-core wire.
Thank you.

Answer 1

Look at the specifications for your boards. There is a current consumption. You sum up. You add a little margin. The voltage is listed there. You just remember it. Then you google or ask the community something like "how to assemble a power supply U = So much, I = so much."

Answer 2

The voltage is the same as for one arduino. Current depending on the load. By itself, the arduin is unlikely to eat more than 150mA (I think about 50-100mA). Accordingly, we take max. current and multiply by the number of arduino, it will come out 4-5A for the worst case.
But no one forbids using several power supplies by combining a common GND wire and hanging 5-10 arduins on each unit.
If there is still a mountain of modules, motors and sensors hanging there, then it is better to measure the approximate current consumption, take a power supply with a margin of at least 30 percent (one fig will lie on the power supply) in current.
Alternatively, if these are some kind of Uno, which are good for 12V power - pull out the computer. ATX power supply, read how to start it, load a little of its + 5V and + 12V lines and calmly hook a garland of arduino on it. Even for a 300W power supply this won't be a problem.

Answer 3

One Arduino draws 50mA, so 30 Arduinos will draw 1.5A.