ScopeMeter Watch 1: Requirements

Since I am on the path toward building electronics lab/test gear and since I am interested in miniature electronics projects, I decided that my first oscilloscope project should be a ScopeMeter Watch!  Who wouldn't want a watch that is also an oscilloscope?

So as I am trying to wrap my head around the requirements for all the things I need to cram into it, I thought I'd make an effort to list what seem to me to be the basic requirements.

In terms of raw functionality (features):

• Two oscilloscope input channels, including:
• Trigger capability
• Adjustable attenuation/amplification
• AC or DC coupling
• Target sample rate: > 50 million samples per second

• Basic multimeter functions:
• Voltage measurement
• Resistance measurement
• Continuity checking

• Power stuff:
• Battery power regulated to necessary power rails
• Battery capacity monitoring
• Battery charging

• User Interface:
• Display screen:  UI modes for:
• Oscilloscope
• Voltmeter
• Resistance/continuity
• Time display
• Settings configuration
• Controls:
• Methods for the user to control all the operations of the device
• Audio:
• Some way to report continuity test results
• Also usable for alarms and other feedback

• External connections:
• Two plugs for probes
• External power for charging

Here is a diagram to show all the stuff that needs to go into the design:

 This is definitely a goofy project, but an interesting challenge.

I am not so concerned about how great the oscilloscope is... Eventually I do want to make some pretty awesome test gear, but first I need to get some experience with the kinds of issues that come up...