Go Down

Topic: Two wire multi color led - How to control (Read 3809 times) previous topic - next topic

dre3rd

Newbie, of course -- Old, 66 two days ago --  Trying to learn, is there anything else to do at this age?

Does anyone know where I can go to get info on controlling a 2 wire multi color led, the type found in cheap solar powered lawn ornaments such as the ones sold at Harbor Freight. 

Thanks in advance

Dan  :~

CrossRoads

Connect it to two output pins, with a current limit resistor, like 270 ohm.
A  High, B Low, light one color
A Low, B High, light the other color
A & B both High or both Low, no color lit up
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

dre3rd

Thank you for the reply.  However it is multicolor, about 5 or 6 different with one fading to the other.  Sorry I wasn't clearer at first.

Quote
Connect it to two output pins, with a current limit resistor, like 270 ohm.
A  High, B Low, light one color
A Low, B High, light the other color
A & B both High or both Low, no color lit up



CrossRoads

Drive it with PWM signal and inverted PWM signal.
Use 74AC04 as inverter
http://www.digikey.com/product-detail/en/SN74AC04N/296-4290-5-ND/375817

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

CrossRoads

Course, if you want to turn both off, will need a way to 'gate' the PWM output to achieve one of the off states.
Microcontroller does not have a way to achieve sync'ed inverse PWM that I am aware of hence the need for external hardware.

Other method is to control 2 outputs using blink without delay style programming.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

CrossRoads

Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

dre3rd

Problem solved.  According to additional info I found at another website, this led has built in IC. 

Hooked up again and it works.  Gnd and D13.  Don't know why it didn't work at first.

Lesson learned.  Try it more than once before asking for help.

Thanks again for the replies and for the birthday

Dan :smiley-red:

Paul__B

Do not power it with more than 4 or 5 volts at most - through a resistor.

If you have specs on it - always the best way - follow them carefully regarding current limiting and voltage.  Because the colour is changing, it does this internally using PWM and if you are driving it with too much current or too much voltage, it is quite easy to overheat them and they can have a short working life.

Some mice I bought years ago had just a current limiting resistor from 5V and burned out quickly.  I replaced them with others - more a "flashing" version than "fading" - with a couple of diodes in series instead of (or was it as well as?) the resistor and they are still going - flashing.

adell

Hi Dan,

Coming back to this subject
Can you share more details on how you managed that.

I have RGB Lights in a Pool too and there is a big Controller in the Room
I want to use Arduino to control it remotely

thanks a lot
my email is   adell@live.fr

Paul__B

Hi Dan,

Coming back to this subject
Can you share more details on how you managed that.
Hello Adell.

Suggest you hop into your TARDIS and send him a PM.

Go Up