In this tutorial, we are developing an exciting project that can be used in many water-sensitive alarm systems. It can likewise be connected to the car’s wiper motor to start the automatic operation of windscreen wipers. The Rain Alarms is an application-based project that detects the rainwater and subsequently switches ON the alarm buzzer, DC motor, or any LED associated with the circuit. Many significant applications and functions can perform on different projects.
Therefore, today we will help you make your own DIY Rain Alarm circuit in the easiest way. The circuit is likewise built by using a versatile 555 timer IC in Astable mode.
Hardware Components
The following components are required to make the Rain Alarm Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | NE555 timer | 1 |
| 2. | NPN Transistor | BC547 | 1 |
| 3. | Resistor | 1K, 100K, 470 ohms | 1 |
| 4. | Capacitor | 10uF | 1 |
| 5. | Buzzer | – | 1 |
| 6. | Battery | 9 V | 1 |
NE555 IC Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 555 Timer
Rain Alarm Circuit
Working Explanation
We have arranged the circuit connection as the 555 Timer IC has been set in Astable mode. Moreover, the Buzzer is to produce an oscillating sound (implies intermittently or periodically On and OFF). Thus, this wavering or oscillating frequency can be constrained by changing the estimation of resistor R2 or potentially capacitor C1. Moreover, the Pin 5 control Pin should be associated with the ground through a 0.01uf capacitor. Resistors R2 R3 and R4 have likewise been utilized to control the semiconductor’s collector junction and base current individually.
Furthermore, the Rain ALarm Sensor should be kept at 30-40 degrees from the beginning, so that water can’t remain on it for a long time. Hence, this will forestall the alarm to continue its operation for quite a while.
Applications and Uses
- The Rain Alarm Sensor can be utilized in agricultural fields to control irrigation systems’ operation per the Rain.
- It likewise utilizes the Home Automation System, for example, shutting the windows and entryways during rain.
- The most common application of this Rain Alarm System is in automobiles to regulate windscreen wipers’ operation.
