RGB LED control. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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RGB LED control circuit. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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Option 1

Below is a simple circuit for driving an RGB LED or multiple LEDs.

RGB LED control circuit. RGB LED control

The LED is controlled by the ATMEL Attiny15L microcontroller (8 pins)

Resistor R1 - about 10 kOhm
Resistors R3, R4, R5 - depend on the type of LED. You can calculate this resistor using the formula:
Rx = (Vcc-Vf)/Im
where Vcc is the supply voltage, Vf is the LED voltage, Im is the maximum LED or MK output current (20 mA)

The program is written in assembler (avra under Linux, but must be compatible with AVR Studio). Timer0 is used for interrupts, 30 kHz for 8 bit PWM. Timer1 is used to change the color of the RGB LED.

RGB LED control circuit. A photo

Option 2. For high power LEDs

The circuit below allows you to drive more powerful LEDs. In this project, I used 3 LEDs with a power of 1 watt each.

RGB LED control circuit. Powerful LED control

Q1, Q2, Q3 - N-channel HEXFet MOSFET transistors with RDSon (transistor open channel resistance) about 50 mΩ.
R1, R2, R3 - 2.2 kOhm
R4, R5, R6 - 15 kOhm.
R7, R8, R9 - depend on the type of LEDs used and Vcc.
If you are using high RDSon mosfets, you must consider RDSon when calculating the resistors:
Rx = (Vcc-Vf)/Im-RDSon
where Vcc is the supply voltage, Vf is the LED voltage, Im is the maximum LED or MK output current (20 mA)

You can download the source code in assembler, as well as the source code for MK ATTiny45 here

Publication: cxem.net

See other articles Section Microcontrollers.

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