Geiger Counter
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@hek
counts per minute:
https://en.wikipedia.org/wiki/Counts_per_minuteA generic V_PULSECOUNT would be fine.
The microsievert is the interesting physical unit you can derive from the cpm. The calculation is depending from the tube you use.
http://cs.stanford.edu/people/nick/geiger/
In my case:
usv = cpm * 0.0057;What about a type S_RADIOACTIVITY?
Here the natural radioactivity in my garage:
The sum of the doses you get over time is the interesting number:
https://en.wikipedia.org/wiki/Sievert -
S_RADIOACTIVITY sounds like useful new device type.
When reading up a bit more. Wouldn't it be better to send in radiation level (uSv/hr) as V_LEVEL. We try to re-use V_LEVEL between device-types for SI-levels of any kind.
I have started this a new issue here to discuss it further:
https://github.com/mysensors/MySensors/issues/567 -
Excellent - thank you guys. I have been looking for an addition to my weather station.
I think I'll place an order for this one: http://www.ebay.co.uk/itm/182166337823?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
This is 100% Japanese built Arduino based Geiger counter. -
It's just a matter on agreeing on what types/data to send. Please post your input in the issue.
@hek The logging software is reporting is as follows every minute:
CPS, 2, CPM, 15, uSv/hr, 0.08, SLOW
(Please see http://mightyohm.com/blog/2012/02/tutorial-geiger-counter-data-logging/)Therefore, there are four parameters here and I propose to use the following:
- CPS --> ???
- CPM --> ???
- uSv/hr --> S_RADIOACTIVITY (V_LEVEL)
- SLOW/FAST -> S_INFO (V_TEXT)
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We can keep it simple - CPM and uSv/hr are the two typically reported.
Even more simple - knowing CPM we can figure out uSv/hr@alexsh1
Calculation of uSv/hr based on CPM is dependent of the tube. If we do not implement the calculation in the sketch, it must be done in the controller. -
@alexsh1
Calculation of uSv/hr based on CPM is dependent of the tube. If we do not implement the calculation in the sketch, it must be done in the controller.@FotoFieber my understanding is that all meters are calibrated to either Cs137 or Co60, which is more likely down to the tube. However, I do not understand why we care about the conversion. My geiger meter reports both uSv/hr and CPM and a number of other meters reports exactly the same. If there is any conversion required, it has to be done in the sketch IMHO.
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It's just a matter on agreeing on what types/data to send. Please post your input in the issue.
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Here is the update for mysensors 2.0
// #define SKETCH_NAME "Geiger Sensor" #define SKETCH_MAJOR_VER "2" #define SKETCH_MINOR_VER "0" // Enable and select radio type attached #define MY_RADIO_NRF24 #define MY_RF24_CHANNEL 13 #define MY_RF24_BASE_RADIO_ID ((uint64_t)0xF8A813FC09CL) // #define DIGITAL_INPUT_SENSOR 3 // The digital input you attached your motion sensor. (Only 2 and 3 generates interrupt!) #define INTERRUPT DIGITAL_INPUT_SENSOR-2 // Usually the interrupt = pin -2 (on uno/nano anyway) #define CHILD_ID 1 // Id of the sensor child #define LOG_PERIOD 60000 //Logging period in milliseconds, recommended value 15000-60000. #define MAX_PERIOD 60000 //Maximum logging period unsigned long counts; //variable for GM Tube events unsigned long cpm; //variable for CPM unsigned int multiplier; //variable for calculation CPM in this sketch unsigned long previousMillis; //variable for time measurement unsigned long timeReceived = 0; unsigned long timeRequested = 0; // Enable debug prints to serial monitor #define MY_DEBUG #include <SPI.h> #include <MySensors.h> MyMessage msg(CHILD_ID, V_VAR1); void setup() { wdt_enable(WDTO_8S); // Geiger initialise counts = 0; cpm = 0; multiplier = MAX_PERIOD / LOG_PERIOD; //calculating multiplier, depend on your log period pinMode(DIGITAL_INPUT_SENSOR, INPUT); // sets the geiger sensor digital pin as input digitalWrite(DIGITAL_INPUT_SENSOR, HIGH); // turn on internal pullup resistors, solder C-INT on the PCB attachInterrupt(1, tube_impulse, FALLING); //define external interrupts wdt_reset(); } void presentation() { // Send the sketch version information to the gateway and Controller sendSketchInfo(SKETCH_NAME, SKETCH_MAJOR_VER "." SKETCH_MINOR_VER); wdt_reset(); wait(500); present(CHILD_ID, S_ARDUINO_NODE); wdt_reset(); wait(500); } void loop() { wdt_reset(); unsigned long currentMillis = millis(); if (currentMillis - previousMillis >= LOG_PERIOD) { cpm = counts * multiplier; send(msg.set(cpm)); counts = 0; previousMillis = currentMillis; } } void tube_impulse() { //procedure for capturing events from Geiger Kit counts++; }@Hek
What do you think about a sensor type geiger counter with cpm and microsievert? V_VAR1 for cpm ist not cool :cool:@FotoFieber Cannot use MyMessage msg(CHILD_ID, V_VAR1); as this is not supported by Domoticz.
