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  • Remote Controlled Buzzer for Lost-and-Found

    You could use smaller batteries, as long as the voltage is correct. A standard button cell battery is 1.5 V, so you would need 4 to reach the 5V minimum required for the receiver, and 6 to reach the 9V used for the transmitter. Even with correct voltage, a smaller battery has less capacity, so the device will die sooner. On the transmitter, to save energy, one option would be to power the linear regulator with 6V and only use a 9V source for the transmitter itself. This way you're not dropping the three extra volts on the linear regulator, which wastes less energy.And yes, you can use a motor to get the vibration you're looking for, here's an example sparkfun product: https://www.sparkfun.com/products/8449. That one accepts 3.3 V DC so it can be a drop in replacement for the buzzer in the…

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    You could use smaller batteries, as long as the voltage is correct. A standard button cell battery is 1.5 V, so you would need 4 to reach the 5V minimum required for the receiver, and 6 to reach the 9V used for the transmitter. Even with correct voltage, a smaller battery has less capacity, so the device will die sooner. On the transmitter, to save energy, one option would be to power the linear regulator with 6V and only use a 9V source for the transmitter itself. This way you're not dropping the three extra volts on the linear regulator, which wastes less energy.And yes, you can use a motor to get the vibration you're looking for, here's an example sparkfun product: https://www.sparkfun.com/products/8449. That one accepts 3.3 V DC so it can be a drop in replacement for the buzzer in the circuitry shown in the instructable.

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    • Remote Controlled Buzzer for Lost-and-Found
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  • Has anyone had success with the purchased camera from http://www.robotshop.com/en/ir-tracking-camera.htm...? If so, I have a question about what it is capable of.What hardware is built into the camera? The picture on this product's Wiki makes it seem like it plugs straight into the VCC, GND, SLA, and SDA of the Arduino with absolutely no hardware or circuits required, but I feel like this might be too good to be true.Is it true that you don't use a 25 MHz crystal, an LTC4301L 3.3-to-5 V converter, a surface mount to DIP adapter, a hex inverter IC, or any resistors/capacitors?Thank you!

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  • robotgirl24 commented on headslant's instructable Magnetic Levitation

    Hi,I have several questions that probably arise more from my inexperience than from any lack of clarity in your instructions.-Can I use any electromagnet, or does it need to be 12V 5W 10kg P30 like the one in your link? How did you choose these specs? Would it be feasible to wind one's own solenoid using magnet wire?-Could you describe in more detail (a drawing maybe) the polarity of the electromagnet and the permanent magnets? I was confused by your description in step 15. Why are there three permanent magnets?-Is the potentiometer used for any purpose other than calibration? Couldn't this same function be achieved in the code instead? Maybe I'm misinterpreting its use...

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