DIY PCB
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- Category: DIY Projects
- Published on Thursday, 09 May 2013 07:23
- Written by DIY-Arduino
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In this article I will describe how to make your own Printed Circuit Board (DIY PCB) using laser printer toner transfer.
You can easily make your own good-quality PCBs, from a laser-printer or copier printout of the desired copper pattern, using an ordinary iron (your wife will not happy with this), and the correct paper type (glossy paper or picture paper). The type of paper used is the most-importantly! Almost all types of paper will work.
You can have finished DIY PCB's at your home in less than two hours, including laser printing, preparing the copper board, transferring the layout, removing the paper, etching the copper surface, and drilling the holes.
You have to start start out by laying out the PCB traces & pads with your favorite PCB design program. I used ExpressPCB, mainly because it's free for download and easy to use.
400Plus
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- Category: DIY Projects
- Published on Thursday, 17 January 2013 05:52
- Written by DIY-Photography
- Hits: 1264
400Plus firmware hack for Canon 400D DSLR (aka. Rebel XTi / KISS Digital X), new tricks for your old DSLR.
Searching for custom firmwares for Canon DSLR's like Magic Lantern, I found an interesting firmware enhancement 400Plus, which offers additional functionality and capabilities to my old 400D (aka. XTi) camera.
400Plus it works by loading into your camera's internal memory automatically upon boot-up from the compact flash card to enhance the native camera firmware. Is not a permanent firmware upgrade, the original firmware remains unchanged and can easily be removed form the CF card.
PWM Arduino
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- Category: DIY Projects
- Published on Wednesday, 05 December 2012 13:10
- Written by DIY-Arduino
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PWM (Pulse-width modulation) can be implemented on the Arduino Diecimila and Duemilanove in several ways:
- Bit-banging PWM
- Fast PWM
- Phase-Correct PWM
- Fast PWM Mode with OCRA top
Pulse-width modulation is a way of encoding a voltage onto a fixed frequency carrier wave (like on FM or AM radio)
Writing a value from 0 to 255 on a Arduino PWM pin, will cause the pin to output a PWM signal whose on time is in proportion to the value written, a value of 255 will be 5 volts on the PWM pin.
Becouse de power limitation of the Arduino PWM pins, I used in my schematics 2pcs of BD139 power transistor, one for every fan.
To protect PWM pins from the higher voltage (12v DC) I used an two channel optocoupler (LTV-826)
The schematics of this Arduino PWM shield is very simple, and anyone can build it. You can download all the project files you will need it here
Amplifier or speaker switch (2 ports)
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- Category: DIY Projects
- Published on Wednesday, 15 February 2012 06:50
- Written by DIY-Audio
- Hits: 988
Amplifier or speaker switch
If You want to compare two amplifiers on the same pair of speakers is very useful such a switch or if you want to compare two pairs of speakers on the same amplifier.
It's a very easy DIY project. You will need 12pcs of speaker 4MM socket plug, a few meters of speaker cable and two switches with 3 position and two contacts, and of course a wooden frame on which will be mount the components. No power supply required.
This DIY amplifier or speakers switch can be made in a few hours and will be useful if you want to compare stereo equipments.
Arduino Light and Sound sensors
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- Category: DIY Projects
- Published on Thursday, 09 February 2012 08:11
- Written by DIY-Arduino
- Hits: 1331
Arduino sensors
I added to photo gallery in the APCC section, pictures with Arduino APCC external sensors. Two light sensors, one LDR light sensor and one photodiode light sensor. The sound sensor is based on LM386 Low Voltage Audio Power Amplifier. The photogate sensor is made with photogate recovered from an old laser printer.
With the light sensor You can take picture with a lightning or lighting up a match. The sound sensor is useful in shooting water drops or balloon bursting. The photogate is useful in water drops photography.