Using ne555 timer IC, you can make a simple ultrasonic (ultrasound) circuit. There are total 8 pins in ne 555 ic. The output pin number of this ic is 3, where a small speaker has to be connected. Its sound is easy to adjust with the help of VR (variable potentiometer). Another advantage of making it using 555 IC is that it operates easily at 3 volts, it also keeps away dangerous insects like mosquitoes and flies. Ultrasonic or ultrasound produces such sounds which humans cannot hear but mosquitoes and other insects can hear this sound and they do not like this sound at all. Insects get disturbed by this sound and go away from your house. But this circuit made of 555 IC is simple, it is not very powerful but it works. Let's make it.
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| Circuit Diagram |
Components Required
To build your ultrasonic sensor circuit, you'll need the following components:
| Qty | Name |
|---|---|
| 1 | NE555 Integrated Circuit (IC) |
| 2 | 150k resistors |
| 1 | 1k resistor |
| 1 | potentiometer (adjustable between 100k and 10k) |
| 1 | 470uF, 16V capacitor |
| 1 | 104pF capacitor |
| 1 | 3V battery |
| 1 | Speaker |
| 1 | Printed Circuit Board (PCB) |
| 1 | Soldering iron and soldering wire |
| 1 | Circuit diagram for reference |
Making Process Guide (Step-by-Step)
1. Connecting the IC Pins
Pin number 2 and pin 6 of the NE555 IC are to be connected together. Then, pin 4 of the IC is to be connected to pin number 8 of the IC.
2. Resistors and Capacitors Setup
Connect a 150k resistor to pin 2 of the IC.
Connect a 1k resistor to the other terminal of the 150k resistor, and connect the other end of the 1k resistor to pin number 7 of the IC.
Connect a 104pF capacitor to the second terminal of the 150k resistor and connect the other terminal of this capacitor to the negative pin of the 470uF capacitor.
Connect the positive pin of the 470uF capacitor to pin 8 of the IC.
3. Setting the Potentiometer
Take a 10k potentiometer and connect its third terminal to pin 8 of the IC.
Connect the first and second terminals of the potentiometer together and then connect to pin 7 of the IC.
4. Speaker Connections
Connect one wire of the speaker to pin number 3 of the IC.
And connect the other wire of the speaker to the common ground of the circuit.
5. Power Connections
Connect the negative terminal of the battery to the common ground of the circuit.
Connect the positive terminal of the battery to pin 8 of the IC.
Use a 3v battery to power the circuit. When the circuit is turned ON, the NE555 timer IC generates ultrasonic sound at a frequency that can be adjusted using a potentiometer. This high frequency sound is inaudible to humans, the hearing range of humans is between 20 Hz and 20,000 Hz, and this circuit generates sound much higher than this, which is why it is inaudible to us, but it can effectively repel insects like mosquitoes and flies.
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