Spacer     Images Scientific Instruments Facebook page       Images Scientific Instruments Pinterest page     Sign up for Images Scientific Instruments Newsletter


CDV-715 Retro Digital Geiger Counter : Page 8



Figure 8 CPS range display chart for Analog Digital Meter.


CDV-715 Retro Digial Geiger Counter

Switching from Imperial to Metric Measurements
If one places a jumper on the two pin header on the back of the Analog Digital Meter, the display will change from imperial measurements mR/hr to metric measurements mSv/hr. The mSv/hr is shorten to mS to fit on the 8 character line. The CPS reading stays the same regardless whether meter is set for imperial or metric.

Building the 8x2 LCD display:
Because the LCD is connected to and powered by our main Geiger counter board, there are a few components we can eliminate from the pcb and simplify its construction. The power and backlight switches S1 and S2 are eliminated and replaced with a jumper. Since we are pulling 5 volt power from the Geiger Counter board, we can also eliminate the voltage regulator U1 and input capacitor C2 shown on the PCB. What's left is a spoonful of components to mount to get the 8x2 LCD Analog and Digital Meter working. Figure 9, is the Analog to Digital PCB for the 8x2 LCD.

Previous Page                                       Next Page

Back to Top