Tutorial 14: Arduino LCD Thermometer

In this tutorial, a temperature sensor (MCP9700 linear active thermistor IC) and LCD are connected to the Arduino. The Arduino reads the temperature from the MCP9700 on analog pin A0 and displays the temperature on the LCD.

Arduino LCD Thermometer Breadboard Circuit

Arduino LCD Thermometer Breadboard Circuit

 

Tutorial 13: Wailing Siren

In this tutorial you will build a wailing siren that plays a tone that increases and decreases in pitch. The circuit is built from two 555 timer ICs and some additional electronic components. The wailing tone is played on a loudspeaker.

Wailing siren circuit built on breadboard

A Wailing Siren Circuit that uses Two 555 Timer ICs