Board 4: Instrument Droid
Summary
Summary
Expanding upon the Golden Arduino design, I added a DAC, ADC, and MOSFET to measure voltage and current of an external power source in order to determine its Thevenin resistance. Use of a four-layer stackup aids in placing and routing signals to a handful of new components. As an added challenge, the board is completely assembled by hand vs. by the fab vendor. The instrument droid's smart LEDs and buzzer flicker, blink and chime to alert when the voltage source is valid, measurements are in progress, and when the final results are ready!
Expanding upon the Golden Arduino design, I added a DAC, ADC, and MOSFET to measure voltage and current of an external power source in order to determine its Thevenin resistance. Use of a four-layer stackup aids in placing and routing signals to a handful of new components. As an added challenge, the board is completely assembled by hand vs. by the fab vendor. The instrument droid's smart LEDs and buzzer flicker, blink and chime to alert when the voltage source is valid, measurements are in progress, and when the final results are ready!
Goal: Bootloadable uC
Goal: Bootloadable uC
(e.g. Smart LEDs are programmable)
Goal: Measureable Signals on ICs/MOSFET
Goal: Measureable Signals on ICs/MOSFET
(e.g. Pulses every 1s increasing/decreasing in value)
Goal: Accurate Resistance Calculation
Goal: Accurate Resistance Calculation
(e.g. Known 10-Ohm source yields approximately 10 Ohm resistance calculation)
Instrument Droid in Action!
Instrument Droid in Action!
Boot-up and measurements taken of a 5V barrel jack power supply with 10-Ohms wired in series. Equivalent Thevenin resistance should then be a little more than 10-Ohms as demonstrated in the video.
Takeaways
Takeaways
Components with 1206 footprints are much easier to solder; SMT components should be mounted using solder paste/heat gun
Double/triple check for footprint orientation to ensure match against datasheet pinout
Making space for additional test points for ADC,DAC,MOSFET would make troubleshooting/debug easier
Report
Report
ECEN5730_Final_Board4_Van_Trees_Rob.docx