i am going to use Arduino Uno to switch on a 5watt led combined to the sound played by an external mp3 sd player module.
the 5watt led needs:
DC Forward Voltage (VF):3.0~ 3.5 Vdc
DC Forward Current (IF): 1000 mA
the MP3 player board needs:
DC 5-9 Volt
so, if used togheter they will absorb 3.5v + 5v = 8.5volt
how should i connect the arduino to power on the led and mp3 module in both cases (if used togheter and single)?
should i need a resistor for the led?
think ya math is slightly off there lol
you can run both devices off a 5v supply
does that LED really need 1A of current thats ALOT, i wouldn't power that from the arduino regulator but use another 3.5v high power regulator for it!!!! LM1117 series or somin (if u want to switch it using the arduino you will need a high current transistor as well!!)
I doubt the audio module draws much current so just run that straight from arduino regulator
to activate the led by button i builded this scheme, should work?
maybe i need to add the 10 K Ohm to the button and to the transistor
not sure how that button pinout is configured.
the the general idea is have your switch input from the microcontroller held to ground using a 10k resistor or some thing, and have the switch between this input and +3.3v/5v so it gets pulled high when the switch is pressed.
never short your power rain straight to ground on your switch as u will reset all your ics lol
in that scheme it's supposed that the arduino is anyway powered by 5v External/usb power supply, right?
