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Temperature Monitor With ESP8266 - IoT
Hi, this description contains the font.h file. If you want to create custom letters you can try: https://maxpromer.github.io/LCD-Character-Creator/
Thank you for sharing it. I needed a simple setting method and this is it.
DS3231 OLED Alarm Clock With 2-button Menu Setting and Temperature Display
Hi, thank you.I was curious too, and extended this project. I was able to send data by IR from the computer. https://www.youtube.com/watch?v=zBs_S6X1TSU
Hi, It works with any kind of coated/ insulated copper wire.
Hi,Actually it doesn't matter. The thing is that the transmitter and receiver coil must have same gauge and number of turns. In my case the wire was 0.3-0.4 mm and the diameter was determined by the width of the pro mini. Approx: 14 turns.
Arduino Wireless Power POV Word Clock
Thank you. Making coil was not the most difficult thing in this project.
Hi, robot797. Thank you for your comment. The schematic is same as in my previous project but you are right. I will upload it here as well. https://www.instructables.com/Arduino-Wireless-Power-POV-Display/
Arduino Wireless Power POV Word Clock View Instructable »
Hello, 47 ohm resistor serial with the motor decreased speed properly for me. Find the line in the code: int timer = 200 ; and set it 170 or less if the speed is high.
Hi,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 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.
Hi, there is no difference.
Yes, you can use either square wave or sine wave. For example: https://www.instructables.com/Wireless-Power-Tr...
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.
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.
Detailed description : https://en.wikipedia.org/wiki/Blocking_oscillator
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.
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.
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.
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…
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.
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.
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.
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.
The next project: POV with IR data transmission. Coming soon.
Thank you. I am thinking about how this could be even simpler. :)
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.
Dear Guido, how do you imagine the shape and placement of the coil? Something like in the picture?
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.
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.
Thank you, I am working on it and uploading more and more information.
Thank you. You are a real POV expert.
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.
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.
Arduino Wireless Power POV DisplayView Instructable »