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16  Using Arduino / Project Guidance / Re: Arduino counts per minute calculator? on: August 06, 2012, 06:21:45 pm
@flamturpolt

I've been writing Geiger counter SW for quite a while now. Indrek's circuit should work with what i have, when connected as Mike suggested. (It would connect to INT0 - pin 2) Your welcome to take a look at it on this page.

It uses a rolling average for CPM, and has lots of goodies. I expect it should just drop in. Should give you some ideas at the least.
John
17  Using Arduino / General Electronics / Re: cheepest place to buy blank 328 chips. on: May 07, 2012, 10:40:22 am
Note: The Digikey link given is for the non-"P" version. It's tricky . . .
ATMEGA328-PU-ND != ATMEGA328P-PU-ND
18  Using Arduino / Networking, Protocols, and Devices / Re: Issue with TinyWireM only recieving one byte on: May 05, 2012, 03:56:57 pm
Quote
Its more important for the "slaves" to be able to push events to the master as they happen
FWI, the way I did that was for the slave to trigger a pin change interrupt on the master when it had something. (There might be some help in the code for this crazy idea I had.)

Quote
Fingers crossed someone might have a solution.
There are a lot of sharp guys here on I2C.
Good luck, John
19  Using Arduino / Networking, Protocols, and Devices / Re: Issue with TinyWireM only recieving one byte on: May 05, 2012, 03:25:04 pm
Well sorry, it's not as I remembered it. It's two ATtiny85 slaves talking to a ATmega master.
The only ATtiny master code I have are the examples included in the library. There are examples in the slave lib too. I notice your "slave code" uses the master lib - that seems strange.
Hopefully someone can give you a hand with this.
John
20  Using Arduino / Networking, Protocols, and Devices / Re: Issue with TinyWireM only recieving one byte on: May 05, 2012, 01:24:53 pm
Without getting my head into your code, I can say this . . .
 - be sure you are using pullups on the I2C lines
 - TinyWireM and TinyWireS did work together (for me) - at least on the ATtiny85
 - I can give you that code I have that does this if it will help

John
21  Community / Exhibition / Gallery / Re: Remote Radiation Monitoring - solar powered on: April 27, 2012, 10:34:10 am
@coding badly
I find it interesting that your questions seem to relate to the usefulness and validity of this project. :-)
In any case, here are some quick answers . . .

The GM tube I originally used (shown in the pictures) was inside the plastic case with no vent holes. (It's a weather proof enclosure.) Nonetheless, there is no problem detecting highly penetrating gamma radiation. (Shipping containers are "x-rayed" with gamma.) The tube would also pick up some strong beta.

Later I replaced that tube with one capable of detecting alpha. Since alpha can be stopped by a piece of paper, I mounted that tube with the alpha window sticking out of the bottom of the case. I used gaskets to keep it weatherproof.

With both tubes I get similar variations in the daily counts as well as spikes. Since the creation of radiation is a random process, you have to be careful about making assumptions based on small variations. (I have not noticed a correlation between counts and time of day.)

I do get spikes every so often. What they might be related to, is an area of speculation I won't go into here. However, it's common to try to correlate spikes to the position of the jet stream, and solar activity.

The detection of radiation was only one facet of this project, the solar power budget, use of the transceivers, and logging are some of the others.

I've created many projects with the Arduino, and this was one of the most satisfying. Hopefully, some of the pieces and concepts may be useful to others.
22  Community / Exhibition / Gallery / Re: Remote Radiation Monitoring - solar powered on: April 26, 2012, 06:17:29 pm
@Coding Badly

Why "why radiation"? It's become pretty common to measure background radiation as just another parameter of the weather. Since the Fukushima disaster several global monitoring networks have sprung up. This is due in part to a mistrust of government readings, the desire to have something more localized, and just for the hell and fun of it.

Personally I'm interested to see the daily max radiation even more that then the max temp and humidity.

I hope this answers your  question.
23  Community / Exhibition / Gallery / Remote Radiation Monitoring - solar powered on: April 24, 2012, 04:14:20 pm


I thought I'd share the details of this project since it's been running fine for several months now.
There are two versions - one that uses the RFM22B transceiver (433kHz), and another that uses the nRF24l01+ (2.4GHz).

The solar stuff is mostly off the shelf Adafruit parts and it's working great.
The Geiger part can pretty much be any open Geiger or it can be replaced with other sensors.

Build information and sketches are here.
 John
24  Using Arduino / Microcontrollers / Re: I2C on the ATtiny85 on: February 22, 2012, 12:32:04 am
Quote
My determination is that to connect to multiple attiny85 slaves you skip the define and specify the address you want in the TinyWireS object begin method calls for each attiny you want to slave (or use multiple defines).

From what I could determine there is no default address, it's all in the initialisation (the begin function)

Ah yea. It  looks like what you determined pretty much agrees with my post above. That's nice.
25  Using Arduino / Microcontrollers / Re: I2C on the ATtiny85 on: February 21, 2012, 11:24:24 pm
You set the slave address in your sketch with the .begin -

#define I2C_SLAVE_ADDR  0x26            // i2c slave address (38)
TinyWireS.begin(I2C_SLAVE_ADDR);      // init I2C Slave mode
26  Using Arduino / Project Guidance / Re: ATTiny85 and RTC? Please Help. Code Errors? :) on: February 20, 2012, 07:06:07 pm
You already have an example of TinyWireM with an RTC.
See the "examples" for that lib - "Tiny85_Temp_LCD_RTC".
John
27  Using Arduino / General Electronics / Re: Solar powered Arduino charging issue on: January 23, 2012, 07:27:03 pm
You might find this to be a good read about charging via solar.
The solar charger she sells works great.
John
28  Using Arduino / Project Guidance / Re: Best Wireless R/C techniques/solutions ?? on: January 19, 2012, 10:51:13 am
pdepuydt
The project I made using the RF22 is here. You'll see it's quite different from yours. I had good comm (RSSI ~100) from my backyard to the far corner of my basement. Even so, there are occasional "no ack received" errors. Not critical for me, but you should plan for that type of problem no matter what transceiver you end up with.

This weekend I will re-do the project with this nRF24L01, so I'll be able to compare. I popped for the best version because antennas are a black art to me and I wanted the amps. The one review on that page claims 100M.

I suspect that 2.4GHz may excel over 433MHz for line of sight, and with many channels to choose from, and carrier detection, interference can be avoided. I'll know more in a few days and will update that project page.
29  Community / Website and Forum / Re: Ignore specific forums on: January 18, 2012, 06:20:33 pm
It would be nice.
Too bad it won't happen.
30  Community / Website and Forum / Re: what's this SOPA garbage on: January 18, 2012, 06:19:06 pm
The road to hell is paved with good intentions.
(and no testing in this case)
Or perhaps it's in solidarity with Wikipedia's protest.
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