Overview of Project
• Objective: to design an affordable and space efficient all-in-one laboratory device.
• Device will include:– Power Supply– Function Generator– Oscilloscope– Spectrum Analyzer– DMM
Initial Goals
• Build Generator portion– Provide adjustable DC power ranging from -20V to
+20V– Generate sine, square, triangle waves w/
adjustable frequency and amplitude (10 Vpp max)
• Push buttons to adjust features to test accuracy and precision
Decisions Made
• Number of outputs– 5 DC outputs (2 fixed pos and neg ports, 1 GND)– 2 Analog wave outputs
• Direct Digital Synthesizer (AD9833) vs. PSoC• Transformer vs. DC-DC converter• Buy C Compiler vs. Free Assembly Code
Structure (Generator)USB
SPI
Analog Waveform
DC
PSoC(CY8C29xxx)
DDS(AD9833)
Positive
Positive
Negative
Negative
USB Host/ClientMAX3421E
DDS(AD9833)
Problems
• Time!!!!!• Limited Resources• PSoC Assembly Language• Lack of $$$$
– C Compiler = empty wallet– PCB Boards = arm + leg– Error in PCB Boards = Incomplete Grade
Future Improvements
• More time in development stage– Explore options before committing
• Better time management– Follow and commit to timeline
• Use Design Notebook– Makes writing paper easier