RaspberryPi

Example

Numbering

• Difference between BOARD and BCM for GPIO pin numbering

https://raspberrypi.stackexchange.com/a/12967

Setting up

• wiringPI

http://wiringpi.com/download-and-install/

NOTE: To compile programs with wiringPi, you need to add:
    -lwiringPi

• RPi.GPIO 아래와 같은 에러가 발생시 (python)

ModuleNotFoundError: No module named 'RPi'

아래처럼 확인 (각자의 virtual enviroment 활용)

pip freeze | grep RPi

없다면, 아래처럼

~/.venv/dev/bin/python3 -m pip install RPi.GPIO

• board

/.venv/dev/bin/python3 -m pip install adafruit-blinka

• Adafruit - htu21d

~/.venv/dev/bin/python3 -m pip install adafruit-circuitpython-htu21d

Scanning an I2C bus for devices

i2cdetect -y 1

Installing Adafruit_Python_LED_Backpack library

git clone https://github.com/adafruit/Adafruit_Python_LED_Backpack.git
cd Adafruit_Python_LED_Backpack
sudo python setup.py install

PI3 GPIO

Custom hat Ver. 0.1

Devices tested

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- 71 -- -- -- -- -- --

0x71 : Adafruit LED Backpacks

The HT16K33 driver chip on these LED backpacks has a default I2C address of 0x70.
Since each device on an I2C bus must have a unique address, its important to avoid collisions or you'll get a lot of strange responses from your electronic devices!

• https://learn.adafruit.com/adafruit-led-backpack
• https://learn.adafruit.com/adafruit-led-backpack/changing-i2c-address

0x60 : MPL3115A2

I2C Barometric Pressure/Altitude/Temperature Sensor

https://www.adafruit.com/product/1893