Cat Repellent Trash Can

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Introduction: Cat Repellent Trash Can

This project is a DIY small solar cat repellent mounted inside a plastic trash can you can place it in anywhere in your garden, very easy to mount and without microcontrollers.

The device emits a continuous sound and lights up two green LEDs (very bright at night) whenever it detects the heat of an animal nearby.

It is really effective and I use it to protect my planters where cats usually pee.

I hope you like and be useful for somebody.

Step 1: List of Materials

  • Plastic trash can
  • Two solar panels (6V, 100 mA)
  • One pulse generator
  • One passive buzzer
  • One PIR sensor
  • One NPN transistor
  • One 1kOhm resistor
  • One little switch
  • One rectifier diode
  • One tiny breadboard
  • One 3,7V battery (1200 mAh)
  • One micro USB battery charger
  • One step up boost DC-DC converter
  • One doubled side PBC board
  • Digital multimeter
  • Wires

Step 2: The Circuit

In the first Fritzing diagram you can see the main circuit without the power supply. Basically it uses a NPN transistor to activate the buzzer when the PIR sensor detects the infrared light emitted from an animal. To make sound the buzzer I have used a pulse generator device (PWM) based on the NE555 chip configurated as monostable. To produce a sound in the buzzer, use a little screwdriver and move the screw in the pulse generator device until you hear a sound.

The power supply is represented in the second Fritzing diagram. To adjust the output to 6V, move the screw with a little screwdriver in the setp up boost converter. The power consumption is very low, so, two solar panels (6V,100 mA) are enough to keep working the device 24 hours.

In the following video you can see how it works.

Step 3: Mounting the Device

To mount the device we have to do the following steps:

  • Open several holes in the plastic trash can to place the leds, the buzzer and the PIR sensor
  • Glue the the tiny breadboard inside the trash can
  • Connect the wires following the Fritzing circuit
  • Connect the solar panels to the power supply PCB
  • Finally, connect the power supply PCB to the tiny breadboard and insert everything in the trash can

¡That's all!

Thanks for reading this instructable.

Step 4: How It Works

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    16 Comments

    0
    tiriveedisrao
    tiriveedisrao

    Question 5 months ago on Step 1

    hello what is the total cost of this experiment?

    0
    TecnoProfesor
    TecnoProfesor

    Answer 5 months ago

    Hello.
    It´s about 20$

    Are the bright green light are really necessary ? Isn't there enough light pollution at night ?

    0
    looonanoo
    looonanoo

    Question 10 months ago

    Well, I am in the process of doing this project, but I am wondering, is there no special code to run the circuit? + Can I get the electrical circuit via email?

    0
    Dcbarry
    Dcbarry

    11 months ago

    Actually, I’m still confused beyond—— I read the text, but how does the battery interface with the battery? Maybe a fuller diagram? This looks like a fun and useful mini project, but need some more help,for newbies like me.

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    The mini USB charger controls the battery load from the solar panel or from the mini usb (green connectors). The battery connects to the device though the yellow connectors.
    After that, you always will meassure 3,7 V in the red connectors. But this is not enough. So you have to use a step up DC-DC boost converter device to convert 3,7V to 6V.
    The output of this device, labeled as GND and 6V, connects to the same labels in the circuit diagram.
    Please note I have included a little switch to avoid the circuit was always working.
    I hope this explanation was useful for you.
    If you have any other question don´t hesitate to contact me.

    0
    Dcbarry
    Dcbarry

    Reply 11 months ago

    Sorry, so solar panel to the green squares, battery to yellow squares (b+ And b-). And then the out+ and out - goes into the vin+ and vin- of the other board, correct?

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    Yes, that is.
    After that use a little screwdriver in that board until you measure 6V at the output before connect it to the circuit.

    0
    Dcbarry
    Dcbarry

    11 months ago

    In the diagram what is the othe point of the diode connected to? I’m new but isn’t something missing?

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    Yes. I have changed the diagram, it was wrong.
    Please have a look again.

    0
    Naresh-s
    Naresh-s

    11 months ago

    What is the use of this

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    I use it to protect my planters where cats usually pee.

    0
    Naresh-s
    Naresh-s

    Reply 11 months ago

    oh!! its funny thanks!!

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    You are welcome and thanks for your comment

    0
    Alex in NZ
    Alex in NZ

    11 months ago

    I did a _huge_ double-take when I realised the size of this thing. That is so neat! What a great idea for keeping your plants safe. Thank you for sharing :-)

    0
    TecnoProfesor
    TecnoProfesor

    Reply 11 months ago

    Yes. It is really small, so you can make several devices and placing wherever you need. Thanks for your comment