• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright | Videos | Circuits for Beginners | Basic Circuits | Hobby Projects | Transistor Circuits | LED Drivers 

You are here: Home / 4017 IC Circuits / Solar Insect Repellent Circuit for Protecting Crops in fields

Solar Insect Repellent Circuit for Protecting Crops in fields

Last Updated on October 19, 2022 by Swagatam 17 Comments

caution electricity can be dangerous

The post explains a simple to build ultrasonic insect repellent circuit which can be installed in farms and used by the farmers for driving away all sorts of insects, bugs, grasshoppers etc in order to protect the crops from these potentially harmful pests. The idea was requested by Mr. Cia Brisat.

Technical Specifications

I am a farmer, and need a simple repelling device for use in agricultural equipment, so i can reduces insecticide use.

device features;
a. solar powered with rechargeable battery.
b. a multi pulse repeller, keeps changing the ultrasonic pulse it emits. prevent pests from getting used to the sound.
c. effective range: up to 5000sf.
d. ultrasonic frequency: from 13.5khz to 95khz.
e. dual speaker or more.

could you please help me with a circuit diagram?

thank you.
cia brisat

The Design

The proposed solar insect repellent is based on an ultrasonic wave generator circuit which works by influencing the normal behavior of insects, ultimately driving them away from the area.

The device functions by generating a high frequency at ultrasonic level (above 20kHz), with short pulses. The frequency of the pulses range from 5kHz to 40kHz, selected randomly and transmitted in the environment through special piezo transducers or high power tweeter speakers.

Please ignore the 100uF/25V capacitor shown in the above diagram, it is just a printing mistake.

Referring to the above diagram, the design depicts an ultrasonic frequency generator circuit which features a random  frequency selector stage. The idea may be understood with the help of the following explanation:

The IC 555 stages on the left and on the right side are both configured as astable multivibrators for generating the respective frequencies across their output pin#3.

How the IC 555 Operates

The left side IC 555 actually generates the ultrasonic pulses whose frequency is determined by the instantaneous high available across one of the associated sequencing pinouts of the IC 4017.

The shifting or sequencing high logic produced across the 10 outputs of the IC 4017 connects the particular resistor in the array such that this resistor allows the calculated amount of voltage to pin#7 of the IC, and becomes responsible for determining a particular ultrasonic frequency for the left IC 555 stage.

The 10 resistors across the 4017 IC outputs can be selected with some trial and error. For example these 10 resistors may be selected as 4K7, 10K, 15K, 22K, 33K, 39K, 47K, 68K, 82K, 100K. You can try other values also for getting other desired ultrasonic frequencies across the output of the left side IC 555.

Why IC 4017 is Used

This enables the production of a randomly changing ultrasonic output at the pin#3 of the left IC 555. These randomly changing frequency ranges can be appropriately fixed by assigning calculated resistors across the indicated outputs of the IC 4017.

The speed at which the random selection is implemented depends on the frequency of the clocks applied at pin#14 of the IC 4017 via the right side IC 555 astable stage.

This speed can be altered by either changing the pin#7 upper resistor or the value of the 10uF capacitor of the right IC 555.

The 22k pot associated with the left IC 555 is used for adjusting the pulse width of the ultrasonic waves, the best response may be achieved by some experimentation and by some trial and error.

Since the generated ultrasonic waves needs to powerful enough to reach the entire field, the emission impact needs to be extremely powerful.

This is ensured by feeding the pin#3 output from the left IC 555 to the input of a 100 watt amplifier. This amplifier may be built at home by using a suitable circuit design such as a TDA7294 IC or by procuring a readymade unit from the market.

Once all the above procedures are executed, a high power transducer or a tweeter may be connected with the output of the amplifier for initiating the intended ultrasonic insect repelling actions.

An example of a 100 watt tweeter can be witnessed in the following image:

Power Supply Specs for the Circuit

The circuit is specified to work with any voltage within 6 to 15V, therefore a 12V battery becomes just sufficient for powering the entire unit, although for delivering 100 watts, the AH rating of the battery will need to be at least 50 AH.

In order to make the circuit independent of an external power source, a solar panel may be incorporated for charging the specified battery at an optimal rate which could be around 10amps for a 50 AH lead acid battery.

This implies that the solar panel must be rated to produce 20amps at 15V in order to charge the battery,  as well as enable the circuit to be driven in the day time while the battery is also being charged simultaneously.

Using a 10 Amp Battery Charger

A suitable 10 amp solar battery charger circuit for keeping the battery optimally charged may be seen in the following diagram and used accordingly:

You'll also like:

  • 1.  Material Storage Level Controller Circuit
  • 2.  Sequential LED Array Light Circuit Using IC 4017 Explained
  • 3.  Build a 2-Stage Mains Power Stabilizer Circuit – Whole House
  • 4.  Solar Insect Killer Circuit for Protecting Crops in Farms
  • 5.  Illuminated Crosswalk Safety Light Circuit
  • 6.  Simple Refrigerator Protector Circuit

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Have Questions? Please Comment below to Solve your Queries! Comments must be Related to the above Topic!!

Subscribe
Notify of
17 Comments
Newest
Oldest
Inline Feedbacks
View all comments

Primary Sidebar

Calculators

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (114)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (100)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (116)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (13)
  • GSM Projects (9)
  • Health Related (20)
  • Heater Controllers (29)
  • Home Electrical Circuits (102)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LED and Light Effect (93)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (65)
  • Mini Projects (148)
  • Motor Controller (67)
  • MPPT (7)
  • Oscillator Circuits (26)
  • PIR (Passive Infrared) (8)
  • Power Electronics (34)
  • Power Supply Circuits (77)
  • Radio Circuits (10)
  • Remote Control (48)
  • Security and Alarm (61)
  • Sensors and Detectors (120)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (60)
  • Timer and Delay Relay (53)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (16)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations

wpDiscuz