500 Series Module Front Panel Design
Thought for 1 min 48 sec
Here’s how to wire a 4‑pin, independent bi‑color indicator so red and green are controlled separately. Use one series Resistor per color. Do not share a resistor between dies.
Option A: source current from GPIO (active‑high)
- RISC-V microcontroller GPIOx -> Rred -> LED_R Anode; LED_R Cathode -> GND
- MCU GPIOy -> Rgreen -> LED_G Anode; LED_G Cathode -> GND
- Drive pin HIGH to turn on, LOW (or Hi‑Z) to turn off.
Option B: sink current to GPIO (active‑low)
- VDD -> Rred -> LED_R Anode; LED_R Cathode -> MCU GPIOx
- VDD -> Rgreen -> LED_G Anode; LED_G Cathode -> MCU GPIOy
- Drive pin LOW to turn on, HIGH (or Hi‑Z) to turn off.
Notes
- Use one resistor per color on your Bi-color LED 0805. Choose R independently for red vs green to balance brightness.
- When powering an LED directly from an MCU GPIO, ensure the LED current is kept between 4 and 20 mA and always check the datasheet. Also check the MCU’s per‑pin and per‑port limits.
- Keep the LED supply at or below the MCU I/O voltage. If VLED > VIO (e.g., 5 V LED supply with 3.3 V MCU), do not connect directly to the GPIO; use a transistor driver or level shifting.
- For dimming and matching, use PWM on each color channel. Turning both channels on mixes to an intermediate color.
If you share your LED supply voltage and your target currents, I can compute the exact resistor values next.
Provide LED wiring type
Ask for resistor values
Confirm MCU drive limits
Handle 5V LED rail
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