AVR ISP Galvanic Isolation

admin    All projects, Work Bench Tools    

History

I had done a project where the AVR is powered via the main 110Vac line,  So I had to find a solution to be able to test my code in real life, I had look to many thing and found very cool opto-isolator, "you must check the datasheet IL717"

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PCB shop

admin    Work Bench Tools     board, circuit, PCB, Printed

History

Here is my PCB shop,  If you do just a little bit of electronics you need this. Home made PCB is a kind of an art.  You can archive without any problem track as small as 10 mils without any trace cut or short.  I've used MG Chemical products with great success. One thing to know is that there is a lots of possibility of problem due to many factor.

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My Lab

admin    Work Bench Tools     AVR, Function Generator, Osciloscope, Power Supply

History

Here is my lab,  it could give you some idea to build yours, with lots of year and money you can do it !

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Bench Power Supply 0-25v @ 0-5amp

admin    Work Bench Tools     Amp, AVR, PowerSupply, Volt

History

This project is like the one that all of you must have done in electronics.  I took the idea from Circuit Cellar. The original power supply provides an output of 2.5-15V at 500mA. This circuit will provide 0-25V at 0 to 5A. You will see there is a lot of modification to achieve this.

This is my second version of this power supply, the first one was made with mosfet who need a higher voltage on the gate I had to use a higher input voltage and because of this there was a lot of heat generated for nothing.  This version work with transistor and it's much more better. 

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AVR Code Debuger

admin    All projects, Work Bench Tools     AVR, Debugger, Terminal

History

    The fact is, 10 years ago this project could have been completed. It will be a useful tool to help you debug code. The challenge was to make a debugger that does not require any MCU resources to be used from the MCU, allowing the debugger to run integrated with the code being debugged.

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Inductor & Capacitor Meter (LCMeter)

admin    All projects, Work Bench Tools     AVR, Capacitence, Capacitor, Inductance, Inductor, Meter

History

    Here is my new inductance & capacitance meter. I had took the analog oscillator part from a well know schematic found on the internet and adapt it for a AVR.  It's impressive to have a very accurate result with a so small circuit.  The way it's work is simple you chance a oscillator frequency with the part you want to find is value.

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Function Generator

admin    All projects, Work Bench Tools     AVR, DDS, Function Generator

History

This project didn’t look complicated but it was. The MCU part is really simple: just some code for the Display, Keypad and DDS Communication.

A DDS is a chip that is driven by a hi-frequency oscillator. I used a 50 Mhz clock. Inside this IC there is a big divider that goes down to less than 1Hz. The resulting clock is passed to another counter which is connected to a Sine ROM table.  If you need a triangle wave, the counter is directly connected to the output.  For a square wave, the signal which drives the counter is redirected to the primary output.
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Frequancy Meter

admin    All projects, Work Bench Tools     AVR, Frequancy, Meter

History

Here is my new Frequency meter who was done with a LCD's cellular phone!!!  This is a simple project. The Frequency is passing  through an op-amp to convert it in a square wave. The ouput of the op-amp is feeding the 3*8 bits counter (24 bits) who can accumulate at a maximum of 16777216 count. 

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