Can i use an avr microprocessor to output a specific current?
if anyone has some arduino code or something for an attiny 13 it would help alot!
8
answers
|
Answer it!
|
sort by:
active |
newest |
oldest
For complex solutions like this I find it is often best to use IC's designed for the job since they are cheap and really simplify the task. Here is an example that may suit your needs:
http://www.maxim-ic.com/app-notes/index.mvp/id/921
One chip shown there is about $1.10 and the other is $1.70, and since the chip is built for the purpose it usually does a good job and eliminates some possibilities for error.
http://www.maxim-ic.com/app-notes/index.mvp/id/921
One chip shown there is about $1.10 and the other is $1.70, and since the chip is built for the purpose it usually does a good job and eliminates some possibilities for error.
Jul 14, 2010. 5:51 PMcdousley (author)
says:
i thought about using it to regulate some leds but im not sure it would even have a high enough current
Directly, it can drive a couple of standard LEDs - the kind that need a few mA to run. Otherwise, you would need to build something.
How much current did you want ?
Steve
How much current did you want ?
Steve
Jul 15, 2010. 1:35 PMcdousley (author)
says:
hi steve i would need 1 amp for my led its a three watt luxeon from sparkfun
Are you looking for a high efficiency circuit, or just something that works ? Steve
Jul 16, 2010. 12:58 PMcdousley (author)
says:
i just need something that would work with just an attiny13 i don't really care about efficiency i just wondered if there's a code you can use to make it output a specific current, i would need about 1000-1200ma if it takes any extra circuits ill just make or buy A driver. thanks for the help
Use a PWM port, filter that to DC, then add a single op amp as a voltgae to current converter.
Jul 13, 2010. 7:46 PMorksecurity
says:
Not directly. You would have to build a digitally-controlled current regulator, and then use the AVR to control that.
 |
