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Ultra Simple, Ultra Small and Ultra Cheap Pet Monitor

I do not know how many of us have met the following situation: we go for a walk with our pet companion, we let him go free and suddenly we do not see him again. Or we play in the yard of our house and they disappear. I’m sure I am not the only one that has this experience. I thought it would be good to get rid of my worries and help myself with something. That’s how this Pet Monitor idea was born. I was inspired by this article.
The pet monitor is made up of two parts: a radio transmitter that attaches to the animal collar and a radio receiver that is at the pet owner. When the animal moves away from the transmitter’s coverage area attached to the collar, the receiver will react with either a sound, a flash of a LED light or a vibration, and will alert the owner. I wanted my pet monitor to be as simple and cheap as possible. You can see in the picture above the monitors block diagram and the programs flowchart for the component devices. I used affordable and easy to obtain components: attiny85 processor, 433 Mhz receiver and transmitter modules, miniature vibration motor, miniature speaker, battery holders.

Components needed:
- ATtiny85 microcontroller 2 pieces 1.46$/piece;
- 8 Pin IC socket 2 pieces 0.05$/piece;
- H34A 433 MHz Miniature Transmitter Module 0.96$;
- H3V4F 433 MHz Miniature Receiver Module 1.69$;
- High Gain 433Mhz Antennas 2 pieces 1.21$/piece;
- Miniature Speaker LD-SP-U15.5/8A 1W/8Ohmi,16mm diameter 1.08$;
- Model 1027 DIsk Vibration Motor 0.6$,
- 3xAAA Battery Holder with On/Off Switch, JST, and Belt Clip 2.95$;
- 3xAA Battery Holder with On/Off Switch, JST, and Belt Clip 2.95$;”

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