• Funny Boat

    04/08/2021 at 04:10 0 comments

    This website is about a boat with a rotating radar made from tuna cans.

    You can see my toy working in those videos:

    Another video:

    Step 1: Attach the Motor

    I found an old foam packaging material in my garage.

    I purchased a low cost gear motor on eBay. This motor included a thin and long rod attached to motor gear output shaft. I used blue tack and thin insulated metal wire to attach the motor:

    Second photo:

    You can see in the second photo that underneath the motor there is a small weight. This weight is attach to the motor rotor and spins quickly with the rotor and used to drive additional loads. I had the make sure that the movement of this weight is not impeded by the foam structure.

    Step 2: Attach the Radar

    You can see the end of the motor shaft here:

    I attached the two tuna cans with blue tack:

    Step 3: Build the Receiver

    My friend ordered this radio receiver from Oatley Electronics:

    For more information click on this link:


    Step 4: Connect the Wires

    Design the Circuit:

    Connect the circuit (I used soldering):

    Step 5: Testing On Ground

    I tested the motor spinning on the ground after assembling the boat:

    Step 6: Testing In Water

    I had to adjust the centre of mass because the radar was not spinning when the boat was slight tilted:

    Probably the real source of problem was not tilted boat but the rusty motor gears. After a few minutes the radar would spin without any issues as  you see in my videos:

    Step 7: Distance Testing

    The distance of the receiver could be at least 10 metres.


    I had to drive the relay with two 9 V batteries making a total of 18 V. If I created 18 V by connecting D or even C batteries in parallel I would definitely burn the relays. The kit has a 9 V input but the relays were not turning ON even after I connected 3 V AA battery block in series with 9 V battery making a total voltage of 12 V that is needed for the relays.

  • Robotic Bee

    12/17/2020 at 09:00 0 comments

    This is an article about the robotic bee that I made.

    The shape of the sculpture is a tripod.

    Here is a video of the sculpture movements:

    Second video:

    Vibrating motion:

    Step 1: Make the Sculpture

    I used a rust proof metal silver coloured wire. This was not necessary because the sculpture is not made to dance in the rain. However, this wire is very light.

    I purchased three dual shaft motors from eBay many months ago.

    I used attached sticky tape around the motor rotors because the wheel holes had a big diameter and the wheels were loosely attached to the motor rotors. You can use either masking tape or clear tape. You can also used super glue.

    I used a rubber band with plastic bags to make the sculpture very flexible and light.

    The wiring for the three DC motors is a parallel connection, not series.

    Step 2: Testing

    I applied 1 Amp to motors raising the voltage to a maximum of 20 Volts. This is very risky because the motors can work at 3V and have a maximum voltage of just 9 V. However, because I did not use gears, I had to apply high voltage and high current.

    Step 3: Filming

    The vibration motion was filmed when I attached my sculpture to a signal generator. Unfortunately the signal generator did not have sufficient current output to drive the three motors. You can try connecting the signal generator output to a transistor coil/relay/motor driver:


    This article shows how to connect two diode to protect the transistor from discharge (because you will need to use two diode for motors - they spin in both directions and thus the direction of the generator current can change):



    The motion of the sculpture can be further improved by using better toy wheel tyres with a bigger diameter and specially designed type shape for better tyre to ground grip.

    Gears will cost more money but are useful. This will allow you increase the weight of your sculpture and thus increase the splitting diameter, demonstrating the flexibility of the sculpture.

  • Vibration Lid

    11/27/2020 at 01:07 0 comments

    This is a simple moving object that I made form vibration buzzers and fish oil lid.

    Those hobby toys are very common. You can use:

    - electric bells,

    - magnets,

    - buzzers,

    - or motors.

    You can see that mobile phone vibration devices are connected in series. I used clear sticky tape and blue tack:

    You can see my toy working in this video at 18 V input:

    You can use less vibration modules and less voltage. You can also use button cells to allow to toy move on its own.