Timeline for What is the max output rating of the pins on the Arduino Mega?
Current License: CC BY-SA 4.0
16 events
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| Dec 19, 2023 at 9:06 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 21, 2023 at 18:09 | comment | added | DataFiddler | The 1k resistor is meant to help the LED survive 12V or even slightly more. If the devices are bright enough you've got the solution: Calculate with 3 mA per led and you're fine. If you notice they look nicer when fed by 12V I'd rather add a little transistor and 4k7 base resistor (5-0.7 / 4700 = 1mA Arduino current) to switch 12V, than exchange the 1k led resistor by a smaller one. | |
| Aug 21, 2023 at 9:02 | history | bumped | Community Bot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| S Jul 16, 2023 at 5:08 | history | suggested | Rohit Gupta | CC BY-SA 4.0 |
Spaced out the image from text and added tag
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| Jul 16, 2023 at 5:03 | comment | added | Nick Gammon♦ | Ah, I see you mentioned a 1k resistor. That's why they don't draw a lot of current. Based on Ohm's law, if you have a 5V supply, and a 1.8V voltage drop (approximately normal for a red LED) and a 1K resistor, then you expect to draw (5 - 1.8)/1000 amps, which is 3.2 mA. | |
| Jul 16, 2023 at 2:44 | review | Suggested edits | |||
| S Jul 16, 2023 at 5:08 | |||||
| Jul 15, 2023 at 20:34 | comment | added | Nick Gammon♦ | It's possible your signals come with inbuilt resistors - looking at the datasheet for them may help. | |
| Jul 15, 2023 at 20:24 | comment | added | Nick Gammon♦ | Sticking to your original point, please explain where you read about the Uno and 800 mA. If you want to make additional explanations please edit the question - don't make an answer. | |
| Jul 15, 2023 at 20:23 | comment | added | Nick Gammon♦ | Are you using resistors between the output pins and the LEDs? If not, you should be. By choosing an appropriate value resistor you can limit the current to any figure. There is an LED calculator web site to help you do that. | |
| Jul 15, 2023 at 20:22 | history | edited | Nick Gammon ♦ | CC BY-SA 4.0 |
appended answer 93835 as supplemental
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| Jul 15, 2023 at 4:28 | comment | added | Nick Gammon♦ | Where does it say the Uno can handle 800 mA? Link please. | |
| S Jul 15, 2023 at 4:27 | history | suggested | Fahad | CC BY-SA 4.0 |
Grammer and formatting.
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| Jul 14, 2023 at 13:05 | review | Suggested edits | |||
| S Jul 15, 2023 at 4:27 | |||||
| Jul 14, 2023 at 12:07 | answer | added | StarCat | timeline score: 1 | |
| S Jul 14, 2023 at 11:47 | review | First questions | |||
| Jul 14, 2023 at 13:56 | |||||
| S Jul 14, 2023 at 11:47 | history | asked | Robert B | CC BY-SA 4.0 |