Since current does not flow through the Piezoelectric Buzzer, it produces no sound thus indicating the absence of water droplets or rain. And no current flows from the Battery to the Buzzer. Now since transistor 2 is also off, it acts as an open switch between its collector and emitter terminal. As no current flows to the base of transistor 2, it remains off.Ĥ. And current does not flow through the collector and then emitter of transistor 1 to the base of transistor 2.ģ. Now since transistor 1 is off, it acts as an open switch between collector and emitter. No Current flows to the base of transistor 1 and it remains off.Ģ. This is due to the absence of a conduction path between the two screws. In the absence of rain or water droplets on the plastic sheet, the circuit remains open between the resistor and the positive terminal of the battery. Since current flows through the Piezoelectric Buzzer, it produces sound thus indicating the presence of water droplets or rain. And current starts flowing through the Battery to the Buzzer and then from Collector terminal to emitter terminal to Ground finally. Now since transistor 2 is also on, it acts as a close switch between its collector and emitter terminal. This flow of current to the base of transistor 2 turns it on.Ĥ. And current starts flowing through the collector and then the emitter of transistor 1 to the base of transistor 2.ģ. Now since transistor 1 is on, it acts as a close switch between collector and emitter. A buzzer is also used for alarm indication, which beeps when alarm is. DS1307 sends time/date using 2 lines to arduino. Here arduino is used for reading time from ds1307 and display it on 16x2 LCD. Current starts flowing at the base of transistor 1 which causes it to turn on.Ģ. In this Arduino based digital clock circuit, we have used three major components which are IC DS1307, Arduino Pro Mini Board and 16x2 LCD module. This is due to the formation of a conduction path between the two screws caused by water. When rain falls on the plastic sheet, the circuit which was open before now becomes closed. They can be used in alarm systems, for keypad feedback, or some games. Terminals of Transistor BC547/8 Pinout of BC547 transistor Interfacing Buzzer to Arduino: Piezo buzzers are used for making beeps alarms and tones. A highly sensitive Transistor-based sensor is obtained due to this Darlington pair combination.Ĭomponents Required for Rain sensor alarm:Ĭircuit Diagram: Rain Sensor Alarm using Transistor We will use two transistors to achieve this, connected as Darlington pair. This Rain sensor can sense even a small tiny drop of water. We are going to build this rain sensor using transistors due to their high current gain capacity. Thus as soon as it comes in contact with water, the buzzer starts beeping. That’s why it is called “a revolutionary electronic component of this century”.Today we are going to build an awesome Transistor Project -Rain Sensor Alarm using two transistors and a Buzzer.Ī rain sensor alarm senses and gives a signal to the buzzer when water droplets from rain fall on its surface. Transistors are used in almost every electronic device today.
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