9/1/2023 0 Comments Rgb common anode arduino![]() #define blueLED 2 // LED Module Pin 3 (B) #define greenLED 1 // LED Module Pin 2 (G) Given below is a quick play code prepared for Digispark. Digispark has PWM on 3 pins – P0,P1,and P4 (more possible with Software PWM), and the GPIO output is 20 mA max per pin. Just to fend off an overkill, you can try the little Digispark board for playing with RGB LED modules rather than perverting the big Arduino. Below you can see its single channel block diagram. Part number of the TTL-compatible 8-channel power IC is TPD2005F available in SSOP-24 package (6-channel output is enough for two LED modules). Recently I found an 8-channel high-side power switch array IC from Toshiba, good for lamp drivers too. For the power driver, you can use one suitable bipolar transistor or power mosfet per channel but now I would like to suggest a mosfet array for that job as it is a very compact solution. Obviously, usage of multiple modules calls for appropriate power driver circuits built with either transistors or ICs. A single RGB LED module never needs more than that so there’s nothing to worry about. Single I/O of an Arduino Uno can sink or source maximum current of 40mA, but in practice it’d be safe to limit that to 2omA per I/O. A more elaborate description on Arduino pulse width modulation is available here Remember that the default PWM frequency of Arduino UNO PWM output is actually 490.196Hz or 976.5625Hz simply depends on the PWM pin number used by default. The above code uses simple pulse width modulation (PWM) with analogWrite by simply call “analogWrite(pin, duty cycle)” where pin is one of the PWM pins (3,9,10,11,5,6) and duty cycle is a value from 0-255 (must be in the range 0 <= level <= 255). The two outputs for each timer will normally have the same frequency, but can have different duty cycle. Each timer has two output compare registers that control the PWM width for the timer’s two outputs. The ATmega328P chip in Arduino Uno has three PWM timers (Timer 0, Timer 1, and Timer 2), controlling 6 PWM outputs. At this point it is worth noting the ‘soft’ connection trick – one I/O is used as the GND of the LED module! /* Concerning the hardware setup, one nice option would be to put the LED module on the Arduino header upright. As mentioned, the experimental code does not include a library. It would be good to start the experiment with a pretty crude code which resides in Arduino and controls the LED module. So it’s easy to build your own fancy lights, festival light, mood lights, signal lights etc. This small LED module, unlike the fantastic Neopixel LEDs, can simply be run through an Arduino (or Attiny85) microcontroller without using any special third-party libraries. ![]() You can see the module’s circuit diagram (drawn by me) below. The most usual is the common-cathode RGB LED module with a single SMD5050 RGB LED and three current limiter resistors. There are mainly two variants of this module having common-cathode (CC) and common-anode (CA) configurations. The RGB LED module shown in the above image is a very popular generic RGB LED module available in the market.
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