Programmable temperature sensor, core of circuit is Atmel microcontroller 89C51 and Dallas DS1822 is used as temperature sensor, 16x2 LCD module which displays temperature and two buttons which can be used accordingly depending on your requirement.

 The quiz buzzer circuit given here can be used for up to eight players.

 The circuit uses IC 74LS373 along with few components that are readily available in the market. The circuit has power supply section, buzzer, LED, reset-switch, and Team Switch.