What is the maximum current the Arduino UNO R3 can supply on digital and analog pins?

Question

Arduino

Here we feed it from the 5V port of the computer or charging from the phone.
How many components can be connected to its pins, so as not to damage anything, especially the arduino itself? What if it is several, for example, 5 LEDs connected on a breadboard to 5 digital pins, each consumes 20mA.
Are there voltage limits? We give 5V to 5 pins.

Answer 1

In terms of voltage, the pins can only give out 0 or supply voltage, in this case 5V. In terms of current, this is 20mA for each pin, but with a limit of 200mA for the entire chip. The maximum allowable current per pin seems to be 40mA, but exceeding it can damage the controller. Look for the exact values ​​​​in the datasheet, I have not worked with the AVR for a long time and I can be wrong.
In real life, AVRs are quite tenacious and it is difficult for them to burn ports, so in experiments it is possible to slightly exceed the values, but in the finished product all this must be well monitored, long-term work with overload can ultimately ruin the controller.