Link to page: pcbheaven.com This is the first video from my Greek style cold instant coffee maker machine. In this video i explain and demonstrate the mechanism for lowering and raising the mixer.
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Link to page: pcbheaven.com This is the second video from my Greek style cold instant coffee maker machine. In this video i explain and demonstrate the mechanism for separating and placing straws into the coffee glass.
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Link to page: pcbheaven.com PID Theory: pcbheaven.com Thermocouple Theory: pcbheaven.com Thermocouple Experiments: pcbheaven.com How to control a PC Fan: www.pcbheaven.com Description: I plan to make a pre-heater for my SMD works, and i will need a controller for the air heater. After learning how the PID controllers work, i will make my own PID controller. The controller will read the temperature from a K-type thermocouple pair. 3 7-segments will be used to display the current temperature and 3 more for displaying the set-temperature. A PWM output will be used to control the fan speed for the hot-air, and an optocoupler-TRIAC pair will be used to control the power of the heater.
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Experiment page link: pcbheaven.com Theory link: pcbheaven.com This is the first experiment with thermocouples. I demonstrate how thermocouples work, and i measure the temperature of a lighter flame.
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Link to page: pcbheaven.com Using the pulse stretching method, i control a simple PC 3-wire PWM fan, and get simultaneously rpm feedback from it, twice a second. With PWM pulses, i achieve really slow rpms, down to 350rpm!!! And no matter what, the fan can never be stalled unless it is broken or mechanically blocked. See the complete article, with the schematic circuit and the PIC firmware to download, at: pcbheaven.com
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Link to page: pcbheaven.com In this video, i break apart DC motor model and then i rebuilt it from a scratch, to explain how a DC motor is made. This video is part of the theory "How DC Motors Work". Find the complete theory with detailed explanation in the link above.
Experiment page link: pcbheaven.com Theory link: pcbheaven.com Now let's have some fun with thermocouples! I measure a boiling water, and a propane heater to see how hot they are using the k-type thermocouple
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Link to page: pcbheaven.com After i published the precision short distance (2cm) IR beam cut detector, (pcbheaven.com i began receiving mails and comments from people asking me how to increase the range. That was impossible with the previous circuit. So, i designed a new reliable long range IR beam cut detector. During tests, i managed to get 10 meters of range (33 feet) with no false triggers.
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Link to page: pcbheaven.com If you are surprised by the content of this video, then i should inform you that i am currently making an automatic machine for making this kind of coffee. This video demonstrates only the procedure. You can find the project worklog along with all the details in this link: pcbheaven.com
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Link to page: www.pcbheaven.com This is a very special page, because this is the first circuit designed and implemented by a PCB Heaven visitor. He made a PC Fan RPM meter with bargraph using the PIC16f628 microcontroller. The sampling rate is excellent, and the bargraph has 10 LEDs to indicate the approximate speed.
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Link to page: pcbheaven.com Every lab must have an etching tank for home-made PCBs. I make my own etching tank with heater and air-bubbles for agitation. My design is for low production - high quality PCBs. The tank that i use can make up to 10 x 22cm PCBs. I use my own DIY heater controller which measures and displays the temperature of the FeCL3, and controls the heater accordingly.
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Link to page: pcbheaven.com This circuit is used to control the speed of a 4-wire PC fan or any other brushed/brushless motor. Follow the link to see the complete documentation, along with the schematic circuit diagram and the bill of materials for this circuit
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Link to page: pcbheaven.com A friend of mine (thanks Siv) gave me this flow sensor. it comes from a professional (and expensive) household apparatus. It is proper for drinking water and can be connected directly to the water supply. It has a built in controller that provides pulses. With this experiment i will find the pulse counts for a specific amount of water.
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Experiment page link: pcbheaven.com Theory link: pcbheaven.com This is the third experiment with thermocouples. I will prove the second law of thermocouples.
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Link to page: pcbheaven.com Worklog page: pcbheaven.com Men Of War is my favorite game so far! I will make a Game Console for this game, so that i can take advantage of game shortcuts. But more important is the joystick that this console will have. This joystick will simulate the keyboard arrow keys along with the control key. In other words, this keyboard will engage and disengage Direct Control automatically upon move! This is the best feature that all Men Of War gamers would like to have, especially when playing this boring "Only Tanks"....
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Experiment page link: pcbheaven.com Theory link: pcbheaven.com This is the second experiment with thermocouples. I will prove the first empirical law of thermocouples.
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Link to page: pcbheaven.com Worklog page: pcbheaven.com Men Of War is my favorite game so far! I will make a Game Console for this game, so that i can take advantage of game shortcuts. But more important is the joystick that this console will have. This joystick will simulate the keyboard arrow keys along with the control key. In other words, this keyboard will engage and disengage Direct Control automatically upon move! This is the best feature that all Men Of War gamers would like to have, especially when playing this boring "Only Tanks"....
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Experiment page link: pcbheaven.com Theory link: pcbheaven.com This is the fourth experiment with thermocouples. In this experiment, i demonstrate why it is important to compensate the reference temperature in order to have accurate readings.
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Link to page: pcbheaven.com PART 1 - The mechanical hack Opening the apartment's door by entering a security code is super cool and usually prepares those who enter of what they are about to see inside, in my case they face my techlab. In this hack, i will show you basically 2 things: First, how you can hack and mod the simple classic keylock mechanism to make it servo-actuated for less than $5, and second how you can make a very cool capacitance touch-pad to enter the security code, with extremely low power quiescence consumption to be long-term battery operated. Link to page: pcbheaven.com This is the first video that i upload for this project. I demonstrate the mechanism that i made to open my door. The requirements were very strict: - No modification on the door or frame is allowed - The door had no pre-installed opening automation - The system must run on batteries as long as possible - The width is limited to some 18-20mm - It must be cheap and simple to make, kids should be able to make it The last requirements is the most important, because as a kid, i always wanted to make such an automation, but it was only possible for the main door of my house, as it had a pre-installed opening system. It was not possible for my room though. Visit my site to see the complete worklog in details with photos key lock touch pad combination lock electronic keylock door electronic automation door lock mechanism hack project circuit schematic DIY intstructions diy electronics
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Link to page: pcbheaven.com I made this project so that i can bend (fold) my plastic acrylic glass pieces. The good thing is that the material is heated only in a narrow straight line, because the aluminum bases around the lamp are water-cooled.
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Link to page: pcbheaven.com The fade-in and fade-out effect gives a cool look and feel to electronic projects. I made two simple analog fade-in fade-out circuits to control multiple LEDs. It can also be used for you car dome light or for off-delay security light.
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Link to page: pcbheaven.com This is an extremely simple and tiny LED off delay circuit with dimming effect. A pushbutton turns on a number of LEDs, which are kept on as long as the button is pressed. When the button is released, an off-delay will keep the LEDs turned on for an amount of time. Then, the LEDs will start dimming slowly, until they are completely turned off. I have include 4 different schematic diagrams for 4 different power supplies (5, 9, 12 and 15 volts). A single circuit can control up to 104 LEDs @ 15Volts.
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Link to page:pcbheaven.com This circuit is a thermometer and thermostat circuit, especially designed for etching baths for PCB making. The circuit provides a Normal Open contact output for connecting an etching liquid heater. Using a thermistor to measure and display the liquid's temperature, it will turn on and off the heater accordingly, and it will keep the temperature of the liquid around 40 degrees (+- 1 degree Celcius).
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Link to page: pcbheaven.com This is the first capacitance touch sensor that i present in my site. This is a PIC-based touch sensor that uses the Frequency-Change technique to sense a touch. The code is written in a way that, even if someone has no experience at all with PIC programming but can provide himself a PIC programmer, he can make the touch button work easily.
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Link to page: pcbheaven.com A full and Half wave stepper motor controller for 2-phase hybrid unipolar stepper motors. The circuit uses the STK672-110 hybrid chip from Sanyo and 7 external simple components. The speed is controlled with the frequency of a pulse signal, while the rotation direction is controlled with a single wire.
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Link to page: pcbheaven.com This is a demonstration video of my new homemade soldering station. I am very pleased with the results and the operation.
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Link to page: pcbheaven.com In this theory page, i explain how the touch switches (buttons) work. I cover various methods, the resistance touch sensor, the AC Hum touch sensor and the capacitance touch sensor. I extensively cover the capacitance touch sensors. Also, i explain how a capacitance touch sensor can be used to make buttons that are covered under non-conductive materials, such as plastic, wood, plexiglas etc. This video is the second part, in which i explain the capacitance touch sensing techniques.
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Link to project: pcbheaven.com This is a very simple thermostat circuit especially designed for monitoring the temperature of a PC cabinet and activate extra fans when it goes above a set point. See all the info, the schematic diagram and the bill of materials in this link above
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Link to page: pcbheaven.com I plan to make a coil-winding machine, and so i needed a stacker mechanism. Inside a PC DVD player, there is a nice 35mm stroke linear guide with a precision moving mechanism, perfect for my needs. The problem is that i did not know how this works, and so i did what i do best: I reverse engineered it to find out how it works.
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Link to page: pcbheaven.com This is the third and last video of reverse-engineering an LCD display (320x220 BW). After many tests and different circuits, i managed to get a clear stable image with a high refresh rate on the LCD.
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Link to project pcbheaven.com This circuit will monitor the fan (3 or 4 wires) and will activate an alarm if the fan runs at very low speed or if it is completely stopped. Find complete info including schematics, BOM and detailed explanation in the link above.
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Link to page: pcbheaven.com This is the third video from my Greek style cold instant coffee maker machine. In this video i demonstrate the sugar and coffee dispenser mechanisms.
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Link to page: pcbheaven.com This circuit is a very reliable and accurate touch keypad with 10 keys. I use a PIC with a built in capacitance 16-channel module. The keypad is interfaced via a 4-bit binary code. I plan to use this keypad for my keycode door-lock circuit.
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Link to page: pcbheaven.com Reverse-engineering an LCD display (320x220 BW) that i could fins NO info on the internet, nor from the manufacturer. It was easier than i thought.
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Link to page: pcbheaven.com I made this function generator for my lab. I used the MAX038 chip as a function generator. Check out the results.
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Link to page: pcbheaven.com Connecting the 555 as a PWM generator, i drive with it an LED array. This circuit performs an LED PWM dimmer with minimum components and high power efficiency, especially in low LED brightness. It can be powered in a wide voltage range from 4 up to 15 volts. Along with its compact size, it is ideal for camping or night fishing, and generally whenever mobility and long-time use is required.
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Link to page: pcbheaven.com A very sensitive IR beam-cut detector pair, for small distances (up to 2.5cm - 1 inch). Can be used for rotary encoders, limit switches or other applications that require precision but no long distance beams. It can be fine adjusted to the point that it will not only detect a beam cut, but it will also detect semi-transparent objects such as plastic bags and other semi-transparent films.
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Link to page: pcbheaven.com This is a very simple circuit for controlling unipolar stepper motors with full step rotation. The circuit uses no microcontroller and no special ICs, except a common 4017 CMOS. The speed of the rotation can be controlled by the frequency of the input pulses.
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Link to page: pcbheaven.com A friend of mine asked me to design a home automation for him. He wants me to build something that will communicate with his air condition through an IR receiver that it has, and it will act as a programmable timer, to turn it on and off automatically. This circuit will help you understand how to use the built-in I2C communication module of PIC microcontrollers, and also how to use the Maxim DS1307 Real Time Clock chip.
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Link to page: www.pcbheaven.com I plan to finish the PC case mod that i began some years ago, and i need a breathing (pulsing) LED circuit. I designed a very simple and very adaptive breathing LED circuit to use it for the power switch. The circuit uses a 555 timer chip and two transistor amplifiers, and has different adjustments for the fade-in and fade-out times.
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This is a 2-wire off delay circuit. It can be connected in parallel to the dome light's selector switch with only 2 wires. When the door is opened, the light will normally turn on. When the door is closed, the light will remain on for an amount of time, pre-defined from a potentiometer on the circuit. The complete article with schematics and fully explained can be found here: pcbheaven.com
Link to page: pcbheaven.com Opening the apartment's door by entering a security code is super cool and usually prepares those who enter of what they are about to see inside, in my case they face my techlab. In this hack, i will show you basically 2 things: First, how you can hack and mod the simple classic keylock mechanism to make it servo-actuated for less than $5, and second how you can make a very cool capacitance touch-pad to enter the security code, with extremely low power quiescence consumption to be long-term battery operated.
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Link to page: pcbheaven.com I made a UV artwork transfer box for my photo sensitive PCBs. I did not use UV lamps, instead i used for test UC LEDs. I was very pleased with the results, and i will put the other artwork transfer boxes high on the shelf.
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Link to page: pcbheaven.com Salvaging parts from old PCBs is one of the most important things that a hacker or a creative electronic enthusiast must have high in his agenda. I used to hack parts with the soldering iron, de-soldering pump and wick, but that is time-consuming and absolutely inefficient. Here is one cool (HOT) way to completely strip a PCB from it's parts in no time, no matter how difficult it looks. ATTENTION! !!!!! What you are about to see may put you into danger. You need to take all precautions before. Wear heat-protective gloves and googles. Do this hack ONLY IN WELL VENTILATED AREAS and avoid the fumes. Wear protective mask if nessecary!!!!!!!!!
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Link to page: pcbheaven.com This is the second video of reverse-engineering an LCD display (320x220 BW). I am completely exhausted. I just managed to upload and display some patterns on the LCD, but i do not have the energy to celebrate.
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This circuit is the classic electronic dice. It uses 7 LEDs to simulate the 6 dice numbers. The complete circuit along with the schematics and detailed explanation can be found here: pcbheaven.com
Link to page: pcbheaven.com The HD44780 is a very popular Character LCD Controller very widely used. The backlit of such LCDs is usually implemented with LEDs, so a simple PWM driver can directly adjust the brightness. Unfortunately, the PWM module cannot be directly used to adjust the contrast. So, i made a very simple and small circuit to interface the PWM output of a microcontroller to the contrast adjustment pin of the HD44780 Character LCD.
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