EP-0098
DockerPi NightLight
Description
DockerPi NightLight is a DockerPi series expansion board with 8 WS2812 RGB LEDs. The expansion board communicates with I2C protocol. It can be used in Raspberry Pi, Jetson Nano and other single board computers (require I2C peripherals).
You can programmatically control the color of each LED, such as Python or C, or you can control the color of each LED directly through system commands without programming. Most Linux distributions include the i2c-tools, which allows you to control this.
DockerPi NightLight can only be used one, but can be stacked with other DockerPi expansion board. If you need to run for a long time, we also recommend that you use our DockerPi expansion board to provide more power.
The module is stacked on the top layer and can be placed with acrylic decoration for better show.
Features
- DockerPi Series
- Programmable
- Control directly(without programming)
- WS2812 RGB LEDs
- Extend the GPIO Pins
- Recommended to be stacked at the top
- Can Stack with other Stack board
- Independent control of each LED
- 2 * Demo acrylic supports your quick start
- 2 * Blank acrylic supports your custom ideas
- Independent of the mainboard hardware (require I2C support)
Official Compatibility Test
Not only support the following development boards, other development boards can be compatible if they have I2C peripherals. (Note: some software changes may be required)
Platform | DockerPi Nightlight | Notes |
---|---|---|
Raspberry Pi All Model | √ |
Gallery
Package Includes
- 1 x DockerPi NightLight
- 4 x M2.5x12 copper sticks
- 4 x M2.5x6 screws (Botton)
- 4 x M2.5x10 screws (Top)
- 1 x Acrylic Pattern Design (Stander)
- 4 x Acrylic Pattern Design (2x Caved and 2x blank)
How to use it
- Turn on the I2C interface
Open a terminal and Run sudo raspi-config
Use the down arrow to select 5 Interfacing Options.
Arrow down to P5 I2C .
Select yes when it asks you to enable I2C.
Also select yes if it asks about automatically loading the kernel module.
Use the right arrow to select the <Finish> button.
Select yes when it asks to reboot.
- Detect the register of the chip on board
i2cdetect -y 1
you will see this result:
- Lights up one LED
i2cset -y 1 0x15 0x01 0xff
The first parameter "0x15" means the address of Nightlight hat. "0x01" means the first LED's red color, every LED has a register address, and you can follow this chart, "0xff" means give the LED 100% brightness and "0x00" will turn of the LED, you can put the value from "0x00" to "0xff" to make a dim LED
Register Map
Register Number | Function | Value |
---|---|---|
0x01 | LED1 Red | 0(FULL OFF) - 255(FULL ON) |
0x02 | LED1 Green | 0(FULL OFF) - 255(FULL ON) |
0x03 | LED1 Blue | 0(FULL OFF) - 255(FULL ON) |
0x04 | LED2 Red | 0(FULL OFF) - 255(FULL ON) |
0x05 | LED2 Green | 0(FULL OFF) - 255(FULL ON) |
0x06 | LED3 Blue | 0(FULL OFF) - 255(FULL ON) |
0x07 | LED3 Red | 0(FULL OFF) - 255(FULL ON) |
0x08 | LED3 Green | 0(FULL OFF) - 255(FULL ON) |
0x09 | LED3 Blue | 0(FULL OFF) - 255(FULL ON) |
0x0a | LED4 Red | 0(FULL OFF) - 255(FULL ON) |
0x0b | LED4 Green | 0(FULL OFF) - 255(FULL ON) |
0x0c | LED4 Blue | 0(FULL OFF) - 255(FULL ON) |
0x0d | LED5 Red | 0(FULL OFF) - 255(FULL ON) |
0x0e | LED5 Green | 0(FULL OFF) - 255(FULL ON) |
0x0f | LED5 Blue | 0(FULL OFF) - 255(FULL ON) |
0x10 | LED6 Red | 0(FULL OFF) - 255(FULL ON) |
0x11 | LED6 Green | 0(FULL OFF) - 255(FULL ON) |
0x12 | LED6 Blue | 0(FULL OFF) - 255(FULL ON) |
0x13 | LED7 Red | 0(FULL OFF) - 255(FULL ON) |
0x14 | LED7 Green | 0(FULL OFF) - 255(FULL ON) |
0x15 | LED7 Blue | 0(FULL OFF) - 255(FULL ON) |
0x16 | LED8 Red | 0(FULL OFF) - 255(FULL ON) |
0x17 | LED8 Green | 0(FULL OFF) - 255(FULL ON) |
0x18 | LED8 Blue | 0(FULL OFF) - 255(FULL ON) |
0x19 | Button | 0x01 - Button Pressed 0x00 - Button Released |
Example Demo(Raspberry Pi)
- Shell Script
The following script demonstrates turn on and turn off each LED.
#!/bin/bash for i in $(seq 1 24) do i2cset -y 1 0x15 $i 0xFF # turn on the led sleep 0.5 i2cset -y 1 0x15 $i 0x00 # turn of the led sleep 0.5 done
- C Language
The following code demonstrates the use of buttons and LEDs.
#include <stdio.h> #include <wiringPi.h> #include <wiringPiI2C.h> #define BUTTON_REG_ADDR 0x19 int main(){ int fd; int is_press = 1; int is_draw = 0; int i = 0; fd = wiringPiI2CSetup(0x15); for(i = 1;i<25;i++) wiringPiI2CWriteReg8(fd,i,0x00); for(;;) { if (wiringPiI2CReadReg8(fd, BUTTON_REG_ADDR) == 0x01 ) { is_press++; is_draw = 1; wiringPiI2CWriteReg8(fd,BUTTON_REG_ADDR, 0x0); } if(is_press && is_draw){ is_draw = 0; for(i = 1;i<25;i++){ if(is_press > 3) is_press = 1; if(((i + is_press) % 3) == 0) { wiringPiI2CWriteReg8(fd,i,0xff); }else{ wiringPiI2CWriteReg8(fd,i,0x00); } delay(100); } wiringPiI2CWriteReg8(fd,BUTTON_REG_ADDR, 0x0); } } }
Please note that the library is required for use:
gcc nightlight.c -lwiringPi -o nightlight
- Python Script
The following code is recommended to be executed using Python 3 and install the smbus library:
import time as t import smbus DEVICE_BUS = 1 DEVICE_ADDR = 0x15 bus = smbus.SMBus(DEVICE_BUS) while True: try: for i in range(1,25): bus.write_byte_data(DEVICE_ADDR, i, 0xFF) t.sleep(0.2) bus.write_byte_data(DEVICE_ADDR, i, 0x00) t.sleep(0.2) except KeyboardInterrupt as e: print("Quit the Loop")
Keywords
- nightlight, dockerpi, raspberry pi, light, i2c, smbus2, iot
Video Tutorial
- Please follow the link:
- [ DockerPi NightLight Board Tutorial| https://youtu.be/KI7cQQLffG0 ]