Geiger counter with SBM20 tube

general_vue2-675x1024

 

I “rebuild” my Geiger counter, the SBM-20 tube was initially inside the box, so, i have put this one inside a 32mm diam plastic tube, for more convenience, wired through a XLR3 cable.

The LCD display alternatively, the “count per minutes” and result on: milli Sievert/year or nano Sievert/hour, you can switch off/on the buzzer, also 3 modes on measure are available, 15/30/120 secs.

This counter is from “Electronique-Pratique” n°368, a French electronic magazine. Shem, pcb, and PIC hex & C source code available. (Microchip compiler C18 v2.40/MPLAB 8.4)

Schematic

SBM20_Shema

Photos

connectique

general_vue

tube_vue

PCB

Downloads

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tarik

Do you have a case file drawn on this geiger counter 3d printer?

tarik

Is not the code written in the pic source file working?

tarik

18f2550 is used in the circuit. 18f2455 is used in the code. Is this a problem?

Bunea Ioan

I saw that the diagram is given a 4×16 LCD display and on the box is a 2×16 LCD display.
I have a 2×16 LCD display, should I make a change in the software or the diagram to work with 2×16 LCD? …
Thank you.

Bunea Ioan

I’m not good at programming, maybe you help me somehow.
Thank you.

superandy

Nice! What is push button (BP1) for?

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