In this article, we connect an KY-029 Dual Color LED to a Raspberry Pi Pico, any Rp2040 type board will be suitable. We actually tested this with a Cytron Maker Pi Pico
The KY-029 Dual Color LED module can emit red and green light. You can adjust the intensity of each color using a Pico PWM pin or simply switch the LED on/off using standard GPIO.
We will use Micropython for these examples but of course you can use the Arduino IDE as well if you have Raspberry Pi Pico support enabled
The sensor looks like this
| Operating Voltage | 2.3-2.6V for green, 1.9-2.2V for red |
| Working Current | 20mA |
| Color | Red + Green |
| Wavelength | 571nm + 625nm |
| Luminous Intensity | 20~40mcd, 60~80mcd |
Series resistors are recommended, about 120 ohms should be just fine.
| Series resistor (3.3 V) [Red] | 120 Ω |
| Series resistor (3,3 V) [Green] | 120 Ω |
Parts Required
You can connect to the module using dupont style jumper wire.
| Name | Link | |
| Raspberry Pi Pico | ||
| 37 in one sensor kit | ||
| Connecting cables |
Schematic/Connection
| Pico | SENSOR |
|---|---|
| GPIO0 | LED Red |
| GPIO1 | LED Green |
| GND | GND |
I didn’t have 120 ohms resistors in fritzing, so they are 150 ohms. It still worked. I also saw no side effects with no resistors fitted but I would recommend fitting a couple for peace of mind.
Code Examples
Basic example in thonny
from machine import Pin, PWM
from time import sleep
# Initialization of GPIO0 and GPIO1 as output
Green = Pin(1, Pin.OUT)
Red = Pin(0, Pin.OUT)
while True:
Green.value(1)
Red.value(0)
sleep(1)
Green.value(0)
Red.value(1)
sleep(1)
Green.value(0)
Red.value(0)
pwm example
import machine
import math
# Initialization of GPIO0 and GPIO1 as PWM pins
Red = machine.PWM(machine.Pin(0))
Red.freq(1000)
Green = machine.PWM(machine.Pin(1))
Green.freq(1000)
RG = [0,0]
def sinColour(number):
a = (math.sin(math.radians(number))+1)*32768
c = (math.sin(math.radians(number+90))+1)*32768
RG = (int(a),int(c))
return RG
# Infinite loop
a = 0
while True:
RG = sinColour(a)
a = a + 0.01
if a == 360:
a = 0
Red.duty_u16(RG[0])
Green.duty_u16(RG[1])
REPL Output
N/A
Links
https://github.com/getelectronics/rp2040learning/tree/main/Sensor%20Kit/KY-029_2_Color