March 21st, 2008

DIY Oscilloscope up to 5 kHz

DIY Oscilloscope up to 5 kHz

Vassilis Serasidis writes: A few months ago as I was surfing on the net, I saw an oscilloscope based on PIC18F2550 microcontroller and a KS0108 controller based graphical LCD. That was Steven Cholewiak’s web site. I had never seen before so amazing microcontroller-only oscilloscope. That was realy impressive circuit, so I decided to design something like that but in C language instead of assembly that I was using all those years. The best solution for me was the WinAVR as it bases on open source AVR-GNU compiler and it works perfect with AVR studio 4. The graphics library that I used, is made by me specific for this project. It’s not for general use. If you want to include it to your codes, you have to convet it as you need to. The maximum signal speed who can show up this oscilloscope is 5 kHz in square signal. For other signals (sine or triangle) the frequency is lower ( almost 1 kHz) for having clear view of the signal.

Me personally i don’t own an oscilloscope, and when i need to measure something on the oscilloscope i ask a friend that owns to help me out. Most oscilloscope are expensive and since they are not used everyday they don’t justify the investment. You should seriously consider this project, i might give it a try myself.

DIY Oscilloscope up to 5 kHz: [Link]

March 7th, 2008

PIC18F2550 Project Board

PIC18F2550 Project Board

The new PIC18F2550 Project Board was designed as the development platform for student projects.

The board features:
MCU: PIC18F2550 with external xtal
ADC: one channel 0-2.5V sigma-delta converter, Linear Technology LTC2400/LTC2420
6-channal 10-bit ADC 0-5V
Display: Two connectors for text LCD or GLCD
USB: onchip USB port with type B connector
Power supply: onboard low dropout regulator, rechargeable battery
Code programming: 10-pin header for In Circuit Loader

The board platform is suitable for developing the microcontroller based instrumentation. Students may build the signal conditioning board, plugs it to PIC project board, develops the code and programs it with loader cable easily.

PIC18F2550 Project Board: [Link]

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