COMA+ The All in One Instrument

Update 2010/12/18: The COMA is back in delevelopment, now, called the COMA+. I am participating in the STM32 Design Challenge, I thought it was a good incentive to continue development of this project. I will improve the original specifications, like using a TFT display and using a few external ICs to simplify the design, like the ICL7135 multimeter IC, and a DDS to generate the waveforms, probably the AD9833.

 

Calculator Oscilloscope Multimeter Analyzer + More	Design files provided for reference only
	Diagrams Schematics Code Forums

The COMA was my entry to Microchip's PIC32 contest. It was also an idea I had back in my academic years. I always wished of integrating an oscilloscope, a multimeter and a calculator in a single portable device. With the PIC32 contest I saw an opportunity for developing my project while getting a chance to win free prizes!

The initial features and specifications:

Main Features:

• 2 Channel, 8bit 16MSPS Oscilloscope
• FFT on acquired data
• 8 Channel Logic Analyzer
• Arbitrary Signal Generator
• Frequency Generator
• Multimeter:
• Volt Meter, 1 M ohm Input impedance

Voltage Ranges	Ammeter	More Features
+/- 204.8V, 400mV sensitivity	+/- 10.24A, 20mA sensitivity 0.2 ohm series	Ohmmeter / continuity test
+/- 20.48V, 40mV sensitivity	+/- 204.8mA , 400uA sensitivity 10 ohm series	L/C Meter
+/- 2.56V, 5mV sensitivity	+/- 2.048mA, 4uA sensitivity 10 ohm series	Logic probe
+/- 256mV, 500uV sensitivity	+/- 20.48mA, 40uA sensitivity 100 ohm series	Frequency meter
	+/- 204.8uA, 0.4uA sensitivity 100 ohm series	Transistor check

• Calculator, able to do math on real-time data
• Graphic LCD 128x128
• SD Card for data storage
• Optional connection to PC via USB or RS-232

Oscilloscope:

• 2 Analog Channels
• Input Impedance: 1M ohm
• Maximum Input Voltage: +/- 25V
• A/D Converter Resolution: 8 bits
• Maximum Sampling Rate: 16MS/s shared

The COMA was among the eight finalists, unfortunetely it didn't win. But the design of the COMA is still active.

Here are some images and videos of the COMA prototype:

 

Wish List:

• Mini Spice Simulator
• Engineering Notes
• Mini Labview kind application
• Games
• MOD/MP3 Player

The COMA will be the ultimate engineering tool!