Timeline for Light multiple RGB Led Strips from same 3 RGB PWM outputs
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 24, 2015 at 14:32 | comment | added | Gerben | 5v with a 220ohm resistor will result in about 20mA of current. Depending on the gain of the transistors and the amount of current the strips use (i.e. depending on their length) 20mA might not be enough to fully saturate the transistor. In that case the leds won't be as bright, and the transistor will get pretty hot. Using MOSFETs will prevent this problem. | |
| Sep 24, 2015 at 1:44 | comment | added | George Rappel | That's true. But the max that the strip uses is 20mA at full bright, and the typical that arduino provides is 40mA. Since i'm never gonna use it at full bright i think it should work. | |
| Sep 23, 2015 at 23:52 | comment | added | Igor Stoppa | Did you check that 20mA is the Max Value, rather than Typical? You might have some unpleasant surprise, if you take chances and do not plan for the worst case. Same goes for the Arduino/Atmega: is 40mA the Min Value or the Typical? You should match Min from the source vs Max from the drain and confirm that they are compatible. | |
| Sep 23, 2015 at 22:04 | comment | added | George Rappel | That was very helpful, i was afraid about this current thing, but apparently each 1 meter uses 20mA, and a pin can output 40mA, so 2 strips would be the perfect amount. | |
| Sep 23, 2015 at 22:03 | vote | accept | George Rappel | ||
| Sep 23, 2015 at 20:28 | history | answered | Igor Stoppa | CC BY-SA 3.0 |