GC-D 100 Revision A

Here's a quick video of the GC-D 100 in action, though in two parts. I only have one LCD, soldered it on the board on the right, and seeing as it has 16 pins, I'd say it's on there for good. The one on the right holds the menu system and calculation code on it. The one on the left is what I threw together today after lots of rework and mysterious problems, and just holds simple code to click the speaker/light the LED for every count of radiation detected.

Revision B should be done pretty soon, there's a few more things I'd like to test beforehand. Once I get the Geiger counter fully functioning with a reworked board then I can confirm the fixes for Rev B are good and send the board off to BatchPCB.

Features in Rev B:
Accurate 4.194304 MHz clock for timing, real time clock
HV header, adding the possibility for a different (external) Geiger tube attatchment
ATmega88PA to use external crystal oscillator, and adds more room for expansion

Fixes for Rev B:
Repositioned the resistors for the Geiger tube - put the Geiger tube in between the 10M and 100k resistors instead
Wired the correct bits from the LCD (DB7:4, not 3:0)
Fixed the hole position for the LCD
Fixed speaker output - speaker and LED were routed from GND to GND through transistor
Added extra capacitor from Geiger tube output to ground to eliminate noise
Moved capacitors C5 and C4 out from under the switches
Fixed silkscreen to show pin functions and outline for both sides for the auxiliary headers
Added ON/OFF silkscreen for switch

Category:

Science & Technology

Tags:

• digital
• geiger
• counter
• rev0

[jkenny1]

@vambreace It was a single time project. If you're interested I can make the board files available to purchase on BatchPCB and you can order them and the parts yourself and built it as a kit. The enclosure needs modification for it to fit though. Total project cost would be around $70-80 I think.

[vambreace]

you are selling this!? where i can get one!!!!!!!?