https://github.com/Josep/micropython-geiger

Geiger counter with micropython card
https://github.com/Josep/micropython-geiger

Last synced: 2 months ago
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Geiger counter with micropython card

• Host: GitHub
• URL: https://github.com/Josep/micropython-geiger
• Owner: Josep
• Created: 2014-11-12T22:47:52.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2014-11-19T16:49:28.000Z (over 9 years ago)
• Last Synced: 2024-01-31T02:45:32.315Z (5 months ago)
• Language: Python
• Size: 1.03 MB
• Stars: 5
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Lists

• awesome-micropython - micropython-geiger - Geiger counter with MicroPython card. (Libraries / Sensors)

README

        
Geiger counter with micropython card

====================================

Hardware Design

---------------

Geiger tube SBM-20:

[http://www.gstube.com/data/2398](http://www.gstube.com/data/2398)/

Pyboard: [http://micropython.org](http://micropython.org)

High voltage generator from

[http://www.mare.ee/indrek/geiger](http://www.mare.ee/indrek/geiger)/

Digitization of tube discharges from

[http://www.techlib.com/science/geiger.html](http://www.techlib.com/science/geiger.html)

(with one gate of 4093 and 3.3V supply)

Power supply from

[http://1wt.eu/articles/alix-ups](http://1wt.eu/articles/alix-ups) and

[http://www.mouser.com/ds/2/268/22008a-53656.pdf](http://www.mouser.com/ds/2/268/22008a-53656.pdf)

Wireless serial port with wixel:

[http://www.pololu.com/docs/0J46/all](http://www.pololu.com/docs/0J46/all)

Log device: fram

[http://www.cypress.com/?docID=50514](http://www.cypress.com/?docID=50514)

Temp & humidity sensor am2302:

[https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf](https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf)

Buzzer: ZX-27T6A1 at [http://dx.com](http://dx.com)

Micropython card pins used:

    Y12    IN/OUT AM2302

    Y10    IN     TIM2_CH4  GEIGER

    Y2     IN Rx    POLOLOU

    Y11    OUT    Power POLOLOU

    GND    GND

    VDD    VDD    3.3V

    Y3     OUT    SCK FRAM

    Y4     OUT    CS  FRAM

    Y5     OUT    SI  FRAM

    Y6     IN     SO  FRAM

    Y8     OUT    BUZZER

    Y9     OUT    RELAY

    Y1     OUT Tx POLOLOU

    X3     FREE   For testing

    X4     FREE   For testing

    X5     FREE   For testing

![photo of mounted proto board here](DAN_6872.png)

Software Design

---------------

Buzzer is activated with programming PWM signal at 3.5Khz. 

AM2302 is one wire, Pin has to be changed from output to input. 

fram has an SPI interface. It is harcoded in python as individual pins. 

The core is the interrupt handler awaken by the discharges of the tube.