Hi , I want to see wiring to connect my LED two wired to Arduino nano and external power (3.3v each) but dont know how to do it as I replaced this with small LEDs -ve wire to ground and +ve wire to DC 11,12. now new LED takes 3.3V and cannot lit without external battery. Can some one show me how to wire it? Thanks
This is the led link to explain more.
https://www.amazon.ca/dp/B07C95VKN5?psc=1&ref=ppx_yo2ov_dt_b_product_details
You are saying you want to power a LED having a Vfwd of 3.3 volts and it's a 1.0 watt LED? That what you are asking?
You have a 1.0 watt LED correct? Your Vsupply is 12 volts? My guess is the LED Forward Current is about 300 mA, would that be correct? You will need a transistor driver for the LED, I suggest a 2N2222 along with a series LED resistor rated for the power it will handle.
Beyond those guesses I have no idea what you are asking?
Ron
Hi Ron, your guesses are correct. The old led pins were on Arduino pin 11,12 and -ve to gnd with a resistor. They were working. Now looking how to use brighter big LED with external power? can you or someone show me in diagram or explain which wire goes to where?
That's about it. You will need a series resistor with the LED and it will be low resistance with 3.3 volts applied and a 3.3 volt LED. I think I estimated a little over 300 mA for current. The 2N2222 has a collector max current of about 800 mA so a 2N2222 should do fine. This or you can look for a LED driver but the circuit you posted should do fine. Just make sure your series resistor is at least a 2 watt resistor. 
Ron
That will not give you full illumination, the led is rated at: voltage 3.6 volts. Note LEDs are current devices not voltage devices. The current rating is missing from your link.
I believe I mentioned LED current in post #2. Yes, I was aware a LED is a current driven device. The link for the LED in question merely tells us it's a 3.3 volt 1.0 watt LED. Actually looking back all the link mentions is:
| Brand | Zerodis |
|---|---|
| Light type | LED |
| Special feature | energy_efficient |
| Wattage | 1 watts |
| Light colour | Cool White |
| Unit count | 50 count |
| Colour temperature | 6500 Kelvin |
| Number of Items | 1 |
| Brightness | 110 Lumen |
| Material | Aluminum |
Not even sure where the Vfwd of 3.3 volts actually came from? Other than:
Ron
The spec 
Third image (left column) in the link provided by OP.
Thanks and there it is.
Ron
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.