Three color LED lamp module

Three-color RGB-led light

RGB-led light module installation schematic

In this example, the system comes with gpio driver to control the extended IO (i2c chip PCF8574A)

Test script program /RVBoards_demo/rvboards_led/ rvboards_led.sh, the program is as follows

/*******************************************************************/
#!/bin/bash
#rvboards led extending gpio control with D1
#This example uses user mode to control rvboards led
#gpio  system number  rvboards-rgbled
#PP0    2020    LED1_R
#PP1    2021    LED1_G
#...    ...     no_led
#PP7    2027    LED1_B

#Apply for gpio
echo 2020 > /sys/class/gpio/export
echo 2021 > /sys/class/gpio/export
echo 2027 > /sys/class/gpio/export
#Enable gpio output function
echo out > /sys/class/gpio/gpio2020/direction
echo out > /sys/class/gpio/gpio2021/direction
echo out > /sys/class/gpio/gpio2027/direction
#Enable gpio high active
echo 1 > /sys/class/gpio/gpio2020/active_low
echo 1 > /sys/class/gpio/gpio2021/active_low
echo 1 > /sys/class/gpio/gpio2027/active_low

#Control the high and low level of gpio output, and control the led to flash on and off
    echo 0 > /sys/class/gpio/gpio2020/value
    echo 0 > /sys/class/gpio/gpio2021/value
    echo 0 > /sys/class/gpio/gpio2027/value
for var in {1..2..1}
do
    echo 1 > /sys/class/gpio/gpio2020/value
    sleep 1
    echo 1 > /sys/class/gpio/gpio2021/value
    sleep 1
    echo 1 > /sys/class/gpio/gpio2027/value
    sleep 1
    echo 0 > /sys/class/gpio/gpio2020/value
    sleep 1
    echo 0 > /sys/class/gpio/gpio2021/value
    sleep 1
    echo 0 > /sys/class/gpio/gpio2027/value
    sleep 1
done
#Log off gpio
echo 2020 > /sys/class/gpio/unexport
echo 2021 > /sys/class/gpio/unexport
/********************************************************************/

Test command:

Add execute permission: chmod +x rvboards_led.sh

Execute the script program as follows：. /rvboards_led.sh, you can observe the blinking color change of the led, as follows