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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display1 hour ago
    Arduino Wireless Power  POV Display

    Hi, there is no difference.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 weeks ago
    Arduino Wireless Power  POV Display

    Yes, you can use either square wave or sine wave. For example: https://www.instructables.com/id/Wireless-Power-Tr...

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 weeks ago
    Arduino Wireless Power  POV Display

    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.

    Detailed description : https://en.wikipedia.org/wiki/Blocking_oscillator

    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.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 weeks ago
    Arduino Wireless Power  POV Display

    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?

    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.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 weeks ago
    Arduino Wireless Power  POV Display

    Yes, it is 5V DC. I used a phone charger.

    Hello DummyD,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 :)I tried to use bridge rectifier but it did not work. I am not sure but my opinion is that the capacitance of schottky diodes in a bridge rectifier ruins their efficiency on higher frequencies. Anyway, one diode provides proper current and voltage.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 weeks ago
    Arduino Wireless Power  POV Display

    Hi DummyD,1. I used 24 AWG ( 0.51 mm) magnet wire for winding coil. 8 turns , 35 mm diameter.(transmitter coil 2x4 turns same size)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.2. Yes, this is a simple sine wave oscillator.3. Parallel condensators tune the resonant circuit.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display2 months ago
    Arduino Wireless Power  POV Display

    Hello Makedougall,1. Your knowledge is right about spindle motors, but this motor is from a cheap DVD player, that is a normal DC motor. It works with 5V DC directly, but I put a serial 47 ohm resistor between the motor and power supply to reduce speed. The motor speed in this case about 1500 RPM.The text is readable, the operation is silent and there is no any vibration. Nothing special connection or driver.2. The transmitter is an Arduino Uno which connected to my computer and gets data from there. If no connection with computer it is capable to send time ( or any saved data) to the rotating Arduino. I found and implemented this idea from here: https://tthheessiiss.wordpress.com/2009/08/05/dirt-cheap-wireless/I managed to send data via my smartphone, but my experiment stopped here d...

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    Hello Makedougall,1. Your knowledge is right about spindle motors, but this motor is from a cheap DVD player, that is a normal DC motor. It works with 5V DC directly, but I put a serial 47 ohm resistor between the motor and power supply to reduce speed. The motor speed in this case about 1500 RPM.The text is readable, the operation is silent and there is no any vibration. Nothing special connection or driver.2. The transmitter is an Arduino Uno which connected to my computer and gets data from there. If no connection with computer it is capable to send time ( or any saved data) to the rotating Arduino. I found and implemented this idea from here: https://tthheessiiss.wordpress.com/2009/08/05/dirt-cheap-wireless/I managed to send data via my smartphone, but my experiment stopped here due to the lack of time. I used "BLYNK" app from Playstore. We are thinking about things same :) I bought a bluethoot module for more playing, but it is still in the untouched plastic bag in my drawer.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display2 months ago
    Arduino Wireless Power  POV Display

    Thank you! The current limiter resistors are under the LEDs. There is a GND wire on the picture that is the common point of resistors.

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  • holybaf commented on Mikhandmaker.'s instructable Homemade Lathe for Drill Press2 months ago
    Homemade Lathe for Drill Press

    Fantastic! Congratulation!

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display4 months ago
    Arduino Wireless Power  POV Display

    Thank you for reminding me. I linked the parts, actually everything's reachable on Aliexpress. I mined the motor from an old DVD player and the part you asked is the upper plate of the disc holder. Yes,the coil powers the board and no data transmission. The coil provides about 6V 100 mA. I attache pictures how it works. About updating... I will upload more and more details but I don't know which parts are more important. First step was updating the part list as many of you asked. Every post and question helps, I appreciate them.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display4 months ago
    Arduino Wireless Power  POV Display

    Hi, thank you.It is a reasonable question. My circuit provides approximately 100 mA because my goal was to build it as small as it possible. 300-350 mA is reachable, I would try: raise the input voltage to 12V, decrease the base resistor to 3.3K , replace the transistor to a stronger one with heatsink and dont forget to use a 5V regulator in the receiver side.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display4 months ago
    Arduino Wireless Power  POV Display

    The next project: POV with IR data transmission. Coming soon.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display4 months ago
    Arduino Wireless Power  POV Display

    Thank you. I am thinking about how this could be even simpler. :)

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  • holybaf's instructable Arduino Wireless Power POV Display's weekly stats: 5 months ago
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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 months ago
    Arduino Wireless Power  POV Display

    Dear Guido, how do you imagine the shape and placement of the coil? Something like in the picture?

    The TCRT5000 consists a phototransistor and an IR LED. I've disassembled it and put the LED on to the transmitter board, and soldered the phototransistor to the arduino. During the operation they are opposite each other. The IR LED lights continuosly.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 months ago
    Arduino Wireless Power  POV Display

    Of course, I take into consideration your suggestions. Absolutely agree with you, your idea can be better in case of higher current consumption because my little circuit has its boundaries in that field.

    Yes, maybe I should make a new "Instructable" about this topic :)

    There is a problem. The direction of movement of the magnets is parallel to the coil. Therefore the induced voltage would be zero. New coil design would be necessary.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 months ago
    Arduino Wireless Power  POV Display

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

    Thank you.

    Thank you. You are a real POV expert.

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  • holybaf commented on holybaf's instructable Arduino Wireless Power POV Display5 months ago
    Arduino Wireless Power  POV Display

    Thank you.

    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.

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  • holybaf made the instructable Arduino Wireless Power POV Display5 months ago
    Arduino Wireless Power  POV Display

    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.

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