Digital Voltmeter

A 4.5 digit digital voltmeter with a seven segment display

• Based on TI's TLC7135 IC
• Four different voltage ranges
  • 200 mV
  • 2 V
  • 20 V
  • 200 V
• Overrange status LED
• Requires 5 V power input over micro USB

Tools Used

Schematic Design: OrCAD 16.2
PCB Layout: Cadence Allegro

Further Improvements

• Investigating alternate IC's for the project
• Adding auto-ranging capability
• Converting the design into a 4.5 digit digital multimeter by adding current and resistance measurement and continuity testing capabilities
• Replacing seven segment display with an LCD display
• Adding data logging capabilities