current control by microcontroller - Electronic Circuits Projects Diagrams Free

anandpatel27 · 18th January 2008, 01:44 PM

hi all

i have a simple circuit in which the light bulb intensity control is done by varying the resistance.i am using a ready module in which the input is DC and i control the current by using a 10K pot. now i want to remove the 10K pot and instead want to use a microcontroller circuit which would control the current. i know it would require DAC and all...

can some one please help me out how to proceed and how is it possible?

**Nigel Goodwin** · 18th January 2008, 01:52 PM

Easily possible, and simple to do - like you say a DAC is all you require, and you could use PWM to create one with a single resistor and capacitor, depending on the input requirements of the module.

anandpatel27 · 18th January 2008, 06:50 PM

Quote:

Originally Posted by Nigel Goodwin

Easily possible, and simple to do - like you say a DAC is all you require, and you could use PWM to create one with a single resistor and capacitor, depending on the input requirements of the module.

i did not get you much. what will be the output of the microcontroller which i have to give to the DAC . also DAC would give me some dc voltage . how will i control the current then?

**Nigel Goodwin** · 18th January 2008, 08:42 PM

I presumed you needed a variable voltage, perhaps you should post a diagram of exactly how it's currently connected?.

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18th January 2008, 01:44 PM	(permalink)
anandpatel27	current control by microcontroller hi all i have a simple circuit in which the light bulb intensity control is done by varying the resistance.i am using a ready module in which the input is DC and i control the current by using a 10K pot. now i want to remove the 10K pot and instead want to use a microcontroller circuit which would control the current. i know it would require DAC and all... can some one please help me out how to proceed and how is it possible?

18th January 2008, 01:52 PM	(permalink)
Nigel Goodwin	Easily possible, and simple to do - like you say a DAC is all you require, and you could use PWM to create one with a single resistor and capacitor, depending on the input requirements of the module. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

18th January 2008, 08:42 PM	(permalink)
Nigel Goodwin	I presumed you needed a variable voltage, perhaps you should post a diagram of exactly how it's currently connected?. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk