ARDUINO LEARNING This is a set of pieces of code intended to learn Arduino usages. The most of these exercises have been done following the BitwiseAr tutorials Index of exercices HC-SR04 Using HC-SR04 sensor to build a distance sensor. HDT11 Using HDT11 sensor to display temperature and humidity by serial window. HDT22+LCD Using HDT22 sensor with an LCD 1602 display using 4 bits for data.