Library for Total Dissolved Solids (TDS) sensor with temperature compensation. A TDS sensor can be used to measure water quality. Compatible devices include https://www.dfrobot.com/product-1662.html and http://www.cqrobot.wiki/index.php/TDS_(Total_Dissolved_Solids)_Meter_Sensor_SKU:_CQRSENTDS01
This is a modified library of digital clocks for LCD 1602 with support for Russian characters. The original project from XOD "Digital Clock Example — Working with RTC Modules" was taken as a basis. If you wish, you can contact me via Google mail.
This example describes how to use the datetime and ds-rtc libraries, format date and time values, and work with real-time clock (RTC) modules for Arduino. Upon the completion of this guide, you will learn how to create a simple digital clock based on a DS1307 I2C RTC module and I2C LCD display.
ASAIR DHT20 humidity and temperature sensor (https://cdn-shop.adafruit.com/product-files/5183/5193_DHT20.pdf). Wraps https://github.com/RobTillaart/DHT20