Self balance robot

 https://fkeng.blogspot.com/2019/03/theory-and-design-of-two-wheels-self.html

Micromouse 2021 Lecture 5: Floodfill

 https://www.youtube.com/watch?v=GoJ-K7gniFI

LCD Hitachi HD66710 controller

https://www-elektroda-pl.translate.goog/rtvforum/topic1099191.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en

https://kbiva.wordpress.com/2012/12/30/hp-laserjet-4500-front-panel/

https://kbiva.wordpress.com/2012/12/30/hp-laserjet-4500-front-panel/

https://playground.arduino.cc/Code/HpLaserJetLcd/

https://learn.sparkfun.com/tutorials/retired---using-the-logic-level-converter 

https://forums.adafruit.com/viewtopic.php?t=22226