Introduction: Arduino Wireless Power POV Display

When I first met this little device, I liked it immediately. I decided to make my own POV. I watched lot of videos, and recognised some main problems. The power supplying of the micro-controller was the biggest. Spinning battery or sliding commutators were both refused. Only option was the air core coil for me. That solution seemed too difficult. I could manage to solve this problem successfully. I created an easy but relatively efficient circuit with a few electronic parts.

Step 1: Schematic Diagram

Picture of Schematic Diagram

The schematic diagram

Step 2: Components You Need:

Picture of Components You Need:

Component list:

1. Arduino pro mini ATMEGA328 5V 16 MHz

2. DS 3231 RTC module

3. 7 pcs smd LEDs

4. 7 pcs 220 ohm resistors

5. TCRT5000 Reflective Optical Sensor

6. 2 pcs 4.7 nF capacitor

7. 1 pc SS34 schottky diode

8. 1 pc 1...4.7 uF capacitor

9. 2 meters 24 AWG ( 0.51 mm) magnet wire

10. 1 pc 1.5 nF capacitor

11. 1 pc BZX 56 transistor ( I tried BC 639, BC 368, worked well)

12. 1 pc 4.7k resistor

13. The motor and some other parts are from and old CD player.

14. 5V power supply,( USB charger or power bank).

Step 3: The Heart of This Project : Coils.

Picture of The Heart of This Project : Coils.

There is a simple coil in the receiver side and a bifilar coil in the transmitter side. The secret is that they have to have same size and same number of turns. In my coils this number is 8. The little trick in the bifilar coil is that coil consists two coils with 4 turns. It is not difficult to make. The preparation process same as in the single coil.

I used 24 AWG ( 0.51 mm) magnet wire for winding coil. 8 turns , 35 mm diameter.

As you can see in the picture we have 4 wires in the bifilar coil and we need a common point. Two of them will be connected to each other that point will be the common point. There are two options. 1. connect red start to blue end. Or : 2. connect blue start to red end.That's all. I am not too good at explaining things, but hope, you understood.

Step 4: Arduino Software

The software:

Step 5: Making Coils Step by Step

Picture of Making Coils Step by Step

Step 6: Building Transmitter

Picture of Building Transmitter

It requires some soldering skills. I will make a version with bigger through hole parts.

Comments

GuidoG4 (author)2017-11-16

Maybe there is a way to make it even simpler. At which frequency does the oscillator work? How many RPMs the display spins? If, instead of the oscillator and fixed coil, you place a lot of permanent magnets on the perimeter of the base and a single coil on the rotating part, you should be able to harvest the motor's energy. If you use a full bridge rectifier your voltage drop will double, but also the current and you can reduce the storage capacitor (that is probably going to be much bigger). With a 100 k resistor placed between the coil and an Arduino pin you can also get the position (internal protection diodes will take care of extra or inverted voltages), doing away with the reflective sensor. If one magnet is missing, there you have your absolute position.

holybaf (author)GuidoG42017-11-17

Thank you. Great idea. Currently the oscillator frequency is about 1 MHz and the speed is 1500 RPM. Some counting is necessary. . Due to a small place, I should increase the velocity.

GuidoG4 (author)holybaf2017-11-18

Well, I thought it was more in the 100 kHz range. With 60 of those https://m.banggood.com/Wholesale-Warehouse-100pcs-N52-6mm-x-3mm-Strong-Cylinder-Magnet-Rare-Earth-Neodymium-Magnet-wp-Eu-977186.html?rmmds=category , if the motor does not slow down too much you will get 80 kHz power pulses, with a full bridge rectifier. You should probably place an inductor between the bridge and the storage capacitor and record the voltages obtained at full load with a battery powered Arduino. It won't be easy, it all depends wether you want to learn a lot of electrotechnical stuff. In any case please specify the working voltage of the capacitors, it's a very important parameter. Also the type (ceramic, alluminum) is rather important. In short, specify their part numbers :-)

GuidoG4 (author)GuidoG42017-11-17

Clearly the coil will have to be placed on the perimeter of the display and be much smaller, with an iron core as big as the magnets. If you take the motor's RPMs, multiply it by the number of magnets and by the storage capacitor and finally divide it by the oscillator frequency you should get the new storage capacitor's value, that, with a bridge rectifier, should be more than halved.

WannaDuino (author)2017-11-18

i think almost no body seen your last picture with the WIRELESS LED LIGHT.

That is called WIRELESS POWER.

Tony--K (author)2017-11-17

Excellent project! I'm going to build it.

I also need more detailed instructions before I can start building.

holybaf (author)Tony--K2017-11-17

Thank you, I am working on it and uploading more and more information.

airton65 (author)2017-11-17

Brilliant, well done

holybaf (author)airton652017-11-17

Thank you.

it15 (author)2017-11-17

Hi, friend.

Your project very much was pleasant.

It was necessary to tell you in more detail: you use TCRT5000 Reflective Optical Sensor concerning D9-D10 on Arduino. It isn't absolutely clear to me as the second part of this sensor (LED from TCRT5000) - directly is connected to an entrance 5v via the current-limiting resistor? Or somehow still?

holybaf (author)it152017-11-17

Thank you. I separated the two parts of TCRT5000. I put the IR LED to a bottom panel, only the phototransistor is on the Arduino. It is also shown in the drawing and a picture now.

eyjang1998 (author)2017-11-16

Wow~ very nice.

holybaf (author)eyjang19982017-11-17

Thank you.

WannaDuino (author)2017-11-16

AMAZING, and in your HONOR i will build this also for you, and link you on my website and channel

i am a clock junky, and POV fanatic, in the best way, coming soon to see on my channel, as you can see i made my own PV stick want, and have a fan that display REAL pictures and LIVE clock and temperature, via an APP.

and yours wil be add to my collection, believe me, this is a FRACTION of what i have and is coming............ THANXXXXXXXXXXXXXXXX

www.wannaduino.com

Time is a fabricated LIE just to undermine us.

holybaf (author)WannaDuino2017-11-17

Thank you. You are a real POV expert.

splodgie (author)2017-11-16

Got to build this. Dived in my Arduino/ESP/Tat box got every thing but NOT the correct RTC, Two now on the way from China,just got to wait 5 weeks for them to turn up. (If the counter balance weight hole was drilled of center the coin could be rotated to tune the balance)

IsaacM92 (author)2017-11-16

This is awesome well done, and great results

holybaf (author)IsaacM922017-11-16

Thank you.

Chrome98 (author)2017-11-15

I would love to make this but there are far too many blanks in the instructions. Please elaborate on this "instructable."

holybaf (author)Chrome982017-11-16

Thank you for your feedback, I really appreciate it. I will share much more information soon. Topics: how to gather parts, how to make coil, how to tune the coil pairs, how to solder SMD parts, how to programm arduino mini via Arduino UNO, how to set up the motor speed, how to balance the disc. Please tell me if I missed something.

mayankbhatia (author)2017-11-16

Very nice! cant wait to see the full instructions :)

cobourgdave (author)2017-11-15

This is a nice instructable and a wake up call to look at Tesla and simple coils for power transfer. Could you describe how you arrived at the coil sizes and number of windings.? It certainly looks like a better solution than slip rings. Thanks

holybaf made it! (author)cobourgdave2017-11-15

Thank you for mentioning Tesla's name, actually I use Tesla pancake coil in this project. I have tried many types of coils. My experience is that size and the number of windings are not really important. Less turns - higher frequency, but same current and voltage. The point is the tuned L-C pair. So in my case the size was determined according to this project physical dimensions.

cobourgdave (author)holybaf2017-11-15

Thanks for your reply and again, thanks for an eye opening instructable

Surajit Majumdar (author)2017-11-15

Awesome project

holybaf (author)Surajit Majumdar2017-11-15

Thank you

Swansong (author)2017-11-14

That's a really neat clock :)

holybaf (author)Swansong2017-11-15

Thank you :)

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