NEX ROBOTICS FIREBIRD V ATMEGA 2560 Hardware Manual page 61

Fire Bird V ATMEGA2560 Hardware Manual
3.14 Buzzer
Robot has 3 KHz piezo buzzer. It can be used for debugging purpose or as attention seeker for a
particular event. The buzzer is connected to PC3 pin of the microcontroller. Also the same
buzzer is used in battery monitoring circuit to alert the battery low indication.
Figure 3.50: Buzzer
Figure 3.51: Buzzer Schematic
Buzzer is driven by BC548 transistor. Resistor 100K is used to keep transistor off, if the input
pin is floating. Buzzer will get turned on if input voltage is greater than 0.65V.
© NEX Robotics Pvt. Ltd. and ERTS Lab, CSE, IIT Bombay, INDIA 61