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
The schematic diagram
Step 2: Components You Need:
Component list: with links
6. 2 pcs 4.7 nF capacitor 4.7 nF 1206
8. 1 pc 1...4.7 uF capacitor 1 uF 1206
9. 2 meters 24 AWG ( 0.51 mm) magnet wire
10. 1 pc 1.5 nF capacitor 1.5 nF 1206
11. 1 pc BCX 56 transistor ( I tried BC 639, BC 368, worked well) BCX56
12. 1 pc 4.7k resistor 4.7k 1206
13. The motor and some other parts are from and old CD player. Or new motor with disc holder
14. 5V power supply,( USB charger or power bank).
Step 3: 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
Step 5: Making Coils Step by Step
Step 6: Building Transmitter
It requires some soldering skills. I will make a version with bigger through hole parts.
holybaf made it!
We have a be nice policy.
Please be positive and constructive.
I have another some questions, the first one is about the RTC module, it comes with a small battery to keep the clock running when there is no external voltage (I guess), is there any reason why you have removed it? (I don't see it in the pictures)
The second one, is about the LEDs, do you have any picture of the solder between the LEDs and their resistors?
Another one, what glue did you use to keep the coil attached?
Finaly, do you have any recommendation to make a correct balancing of the upper disc?
Thanks a lot for you support!
See you, William
PS: Take a look at the small PCBs inspired by your design.
This kind of battery is not rechargeable and I had a discharged one. I wanted to use a rechargeable coin cell battery and place it on the surface of disc as a balance weight. After that I re-thought the design and dropped that idea. Of course you can use small battery for continuous working. I used cyanoacrylate super glue for coils. I balanced the disc with a holed coin. I will upload photos about of resistors on back of LED's.
I liked your design! Well done!
Hi Mr.Holybaf. Very nice project, congrats and thanks for your patience. I have a question, I don't what it's the SMD component conected at transistor emitter pin, looks like a Tantalum Capacitor, but no appear in the Schematic Diagram. Thanks 4 u time.
PD:By the way, I'll be waiting for the mini POV with IR data transmission.
Hi WilliamM25, thank you . That is a filter capacitor between GND and 5V. 22u 16V. My next project will be the mini POV with IR data transmission hopefully next month.
Is there a difference using a sine wave or square wave signal for the transmitter part??
Hi, there is no difference.
so basically on what i understand, PWM is just a square wave signal with adjustable duty cycle and the blocking oscillator is just a generator of square wave signal but the signal created by that oscillator cant be adjusted like the PWM....and is it okay to use either square wave or sine wave signal for the transmitter??TIA
Yes, you can use either square wave or sine wave. For example: https://www.instructables.com/id/Wireless-Power-Tr...
thank you for all your reply but i cant still grasp how the blocking oscillator can create a sine wave, can you pls explain it to me because i need it for my presentation. i hope u understand
Detailed description : https://en.wikipedia.org/wiki/Blocking_oscillator
The blocking oscillator itself does not create a sine wave, it is a square wave, however the load acts as a filter, and the higher end components of the square wave are filtered out, leaving the fundamental.
when you say square wave do you mean it as a PWM? TIA
The PWM means pulse width modulation. We talk about PWM when the rate of L and H level is important for us, like dimming LED or controlling motors. In this case no sense to use PWM or does not matter its percentage.
sorry if i misunderstand some of your reply liek for example;
my question: did u use a sine wave signal to induced a current to the other coil?
your answer: Yes, this is a simple sine wave oscillator.
and here is some of your reply: I don't use sine wave generator. My little circuit is a tipycal blocking oscillator. (https://www.homemade-circuits.com/blocking-oscilla... it creates sine wave by itself. The frequency is between 1-2 MHz.
You can use 555 if you like difficulties :)
Okay, It was my fault. The generator meant for me a separated equipment or device with adjustable output and sign shape. So I thought that your question referred of it. The output of ideal blocking oscillator is like square wave. When I measured the output of my oscillator the shape of the sign was rather sinusoidal than square.The reason was explained by steveastrouk (Thank you). I chose this solution because that was the simplest and most effective and really did not matter the shape of the sign. So I did not use generator but use sine wave.
can you plss share to me the schematic diagram of your blocking oscillator for my reference? i hope u can share it to me...TIA
See Step 1: Schematic diagram. That is the blocking oscillator in the left side of picture.
See Step 6: detailed description with pictures how to build it.
I hope it helped.
and in case i use the 555 ic what kind of configuration should i use is it the astable or the monostable?
Astable is simpler. Monostable needs a trigger ( eg. a second 555 in astable mode ???) Which would make it even more complicated .Why would you use 2 IC's + 1 FET instead of 1 transistor?
so what is the input voltage for your blocking oscillator? it is 5 volts?