Frequency Probe

 Building on top of the logic probe and expanding its functionality, next feature to add is frequency counter. Logic detection by the LM339 had been replaced by very inexpensive microcontroller. Additionally resistor divider measures voltage on the input


 

Case / 3d files
The case for the probe is identical to logic probe with small alteration to the LCD display opening as its dimensions are slightly larger  and inner rim had been altered to bring the LCD closer outward.






Documents

• Schematic
  PCB
  Source code
  3D Top STL file  (LCD)
  3D Bottom STL file