Raspberry gpio

=== pigpio ===
https://raspi.tv/2013/rpi-gpio-basics-1-how-to-check-what-rpi-gpio-version-you-have
https://raspi.tv/2013/rpi-gpio-basics-6-using-inputs-and-outputs-together-with-rpi-gpio-pull-ups-and-pull-downs
https://github.com/joan2937/pigpio
http://abyz.me.uk/rpi/pigpio/download.html
=== libgpiod ===
https://forum.armbian.com/topic/6249-build-libgpiod-the-new-gpio-interface-for-user-space/
=== pinouts ===
https://pinout.xyz/pinout/pin7_gpio4# 
=== bristolwatch ===
https://www.youtube.com/watch?v=1p1rgkslO0U i2c
http://www.bristolwatch.com/rpi/i2clcd.htm
=== i2c ===
https://github.com/bradgillap/I2C-LCD-Display
https://www.youtube.com/watch?v=CoC2qDgqmac
https://github.com/HariHend1973/lcd_mpd import SMbus
https://raspberrypi.stackexchange.com/questions/79091/smbus-i2c-sensor-returns-fixed-data 
=== pigpio and i2c ===
https://i2c-lcd.readthedocs.io/en/latest/installation.html #install i2c_lcd
* sudo pigpio
=== links ===
Raspberry pi
Category:Rasberry pi