"MyGeiger" is dosimeter module for DIY Geiger Counter. It has high quality PCB with soldered components, pre-programmed microcontroller and graphic LCD. To build finished device you will need to supply your Geiger Tube, Battery and Enclosure. We have in stock Geiger Tubes for your choise. SBM-20 is excellent tube that can be installed into PCB, but any other tubes that require anode voltage of 400V are compatible with the kit. You can change conversion factor in calibration menu for your tube.
If kit purchased soldered, it still require minor solder work. For example you'll need to solder battery wires to the PCB, tact switch buttons or connect external modules.
Take note, if you purchase not assembled kit you are fully responsible to solder this unit correctly! Soldering of the kit require good solder skills and ability to read and understand electronic schematic! We are not responsible if you damage the PCB or kit's components during assembling process or wrong parts soldering. Any hardware modifications are not acceptable for technical support.
"MyGeiger" can be connected to computer for saving log files via USB UART TTL module or via COM port with MAX232 IC. It will save CSV logs files with system time and CPM value. Native logger software can be used for creating csv log files, uploading CPM data to Xively or RadMon. Also the dosimeter can be connected to Arduino or other MCU for capturing interrupts from the GM Tube, for example you can create your own monitoring projects or integrate "MyGeiger" into existing network.
The dosimeter has low power consumption and can be used as portable device with 4x 1.25V Ni-MH batteries or with one 3.7V Li-PO. However we advise to perform calibration only when device is connected to 4.8V-5.0V power source to supply sufficient VDD level for stable EEPROM WRITE operation.
With SBM-20 tube it can register from 0.01uSv/h up to 1mSv/h radiation.
The LCD has fast response graphic scale that represent one second CPM measurement. The resolution of the scale is up to 800 cpm. It can be useful for instantaneous assessment of nuclear radiation level.
1x DIY Geiger Counter Kit "My Geiger"
1x Nokia LCD 5110 (LCD may have some light scratches on the surface. There is no new Nokia LCD available in the world, but we try to delivery the best samples we can get)
Download Radiation Logger Software (require UART TTL module)
The project run with Nokia 5110 LCD module. You can find many modifications of this module on eBay with different pcb pinout. Nokia displays where previously installed in retired Nokia 3310 cell phones and it no longer produced by Nokia. All Nokia displays in the word are "second hand" and may have some light scratches on the surface. We supply the best quality we can get from the supplier. Otherwise Nokia displays has extremely low power consumption and can operate at 3.00V-5.00V supply voltage. The kit supplied with lcd module that has following pinout: RST, CE, DC, DIN, CKL, VCC, LIGHT, GND. The module can be replaced with any other 5110 model for your consideration, but may require different wiring.
TAKE NOTE: We are not responsible if you damage the PCB or other kit's parts due to wrong connecting of batteries, any soldering or modifications. Do not touch the board when the module is connected to power source: 400V high voltage is presented on tube clips!
PIC16F876A software description:
High Voltage: High voltage generation fully controlled by microcontroller. The MCU perform precision measurement and correct high voltage when battery capacity goes down.
Measurement Period: For devices with 1.00-1.02 firmware version is auto adjusted. 30 seconds for background level, 10 or 5 second for high radiation. Measurement countdown is presented on the LCD. For devices with 1.03 firmware version measurement period is fixed to 10 seconds, but moving average algorithm is used.
Graphic Scale: Fast response graphic scale on the LCD with range from 30cpm to 800 cpm.
Radiation Dose Range: Display ranges: 0.01uSv/h - 9.99uSv/h; 10.0uSv/h - 99.9uSv/h; 0.10mSv/h - 9.99mSv/h Take note, SBM-20 tube can register up to 1mSv/h because of tube limitation. Radiation dose depend on tube type you use and on conversion factor value! By default the module has 0.0057 factor that can be changed by user.
Battery Indicator: Available only for Ni-MH batteries by default. Li-PO is also supported in beta-mode.
Buzzer sound: User can mute sound with key.
Calibration Menu: simple calibration menu where you can change conversion factor from 0.0010 to 0.0250 with 0.0001 step. The factor saved to EEPROM. Alert Threshold is saved only for session. Alert is calibarted from 100cpm to 5000cpm with 10cpm step.
LCD Backlight: By default the microcontroller will power off backlight for energy saving. You can light up the backlight for several seconds if pressing "OK" button. When CPM value will reach Alert threshold the MCU will light up the backlight by auto to warn you about dangerous level.
UART Logging: Dosimeter send CPM value via UART each time it updates on the display. Radiation Logger software is recommended. Our freeware software can be used for creating local log files and for direct uploading data to your Xively account for online monitoring!
Geiger Bot: BOT pin with several external components can be used for connecting the kit to IPad. 2500Hz pulses with 1ms duration is presented on BOT pin for each event from tube.
Arduino: The dosimeter can send tube events as interrupts to Arduino or other MCU via ARD pin. It generate 2us low-high-low pulses on pin ARD. This function is excellent for building radiation monitoring station based on Arduino. RH Electronics monitoring feed can be visited here.
External Relay: You can drive relay module or additional alert led from ALR pin when CPM value will rise to saved alert threshold.
This kit officially supported by free online radiation monitoring project http://radmon.org Please contact website admin to join! Require USB-TTL module.
Assembly sequence flow video of "MyGeiger" kit:
"My Geiger" is high quality product with technical support.
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