Hardware

@ahhk said: Hi, i searched a lot and read a lot about step-up and step-down converters in the last days, but i didnt find a really "good one" - and already soldered on pcb. Soldering is in general not a problem for me, except smd (i hate smd soldering). Has anyone a hint for a good booster (2xAA => 3.3V) or a step-down-regulator (3xAA => 3.3V) ? Greetings Andreas How about this? http://www.ti.com/product/TPS82740B/description&lpos=Middle_Container&lid=Alternative_Devices

Hi guyz, i just wanted to ask if I would need to make any modification to the code if i were to switch my current Ethernet gateway and my sensors from NRF24 to RFM69

Use the + version on the gateway ;-)

I use http://forum.mysensors.org/topic/838/windows-gui-controller-for-mysensors for logging the communication between the controller and the nodes.

is there a way to display these things (temp sensor readings) on to a web page?

i use 2cell 7.4 volt recycled laptop battery packs for my projects thay have a natural discharge of 5% a month but do some reading and research on how to handle and charge them...and you should be fine..plus recycleing lappy batterys is good for the enviroment..and you also learn about the new breed of batterys and cells :)

Network topology is the bargain of the assorted rudiments (links, nodes) of a computer network. Fundamentally, it is the topological arrangement of a complex & may represent actually or reasonably. link text

@DNKROZ said: Hi. I recommend you to check the relay example, the sketch includes support for multiple relays and you'll understand what do do in that scenario, but answering you initial question, no, I'm afraid you can't do gw.present(CHILD_ID, S_DISTANCE1, S_DISTANCE2, XXXX); but you can do gw.present(CHILD_ID1, S_DISTANCE); and gw.present(CHILD_ID2, S_DISTANCE); after that one... and... so on, you'll see better reading the relay sketch. Interesting, where is this Relay sketch? Regards

@rvendrame said: Even being the RFM69x demanding for more power? I guess it makes the diference for battery operated nodes. Jeenodes says "The conclusion here is: for these types of uses, with occasional brief wireless sensor data transmissions, the power consumption of the wireless module is not the main issue. It’s far more important to keep the idle (i.e. sleep mode) of the entire circuit under control." http://jeelabs.org/tag/lowpower/ So, taking that literally, hopefully the RFM69HW high Tx current consumption won't be an issue.

Ok I think I will try the original idea with the nrf24l01 and arduino pro mini. But I am still waiting for my pro minis to arrive and only have a old one with a ATmega168. I read something about disabling the debug in mysensors.h. Will I still be able to fit an button sketch with wireless using the smaller ATmega168?

@BulldogLowell http://www.youtube.com/watch?v=aj0ORplI630

I'll try to handle crosstalk with software, it shouldn't matter if the data dumps arrive at one or the other GW. If it will pose a problem, wifi space getting too crowded or something, then it's possible to separate the gateways more so they dont interfere.

@xefil said: Thanks @hek and @kalle Sorry, but I'm not good to understand the debug of the scanners. In the RF24/examples/scanner/ the range is between 0000->->->7777 Those are the high order nibble of the channel byte. The low order nibble is just below it. The 125 channel numbers are printed "sideways" in hex. I would expect a list of channels between 1 and 13. You're thinking of wi-fi. This isn't wi-fi. In the second scanner (wiFi scanner found on arduino forum) It's more accurate. It seems noisy between channel 3 and 9. So, the questions are: What does default channel 76 mean? 2476Mhz? yes Would mean above channel 13, on channel 14. In this case these channels are free, based on the results. I've seen I can use: #define RF24_CHANNEL 76 //RF channel for the sensor net, 0-127 How to interpret the scanners result? Most of all the "RF24/examples/scanner/" which has an output I cannot identify in a channel. The bigger the number below the channel, the more active it is. I would like to understand the result and so choose the right channel, not only trying without knowing what I'm doing :) Thanks a lot for the support! Simon

Yes, just stick it on your Arduino and your good to go. I did have to change the pin configuration with an Arduino Mega2560 and the ethernet shield. I've placed a comment with my pin config in that tutorial.

if you want to support the project, then use the links in the store or buy the sensebender from itead :)

It looks like it's just an ultrasonic transducer. With multiple ultrasonic transducers one could create a wind speed and direction sensor. (If you measure N/S wind speed and E/W wind speed you can get total wind speed and direction). The typical cheap distance measuring modules use very cheap 40KHz transducers; these operate at 200 KHz. Wind speed can be measured by timing a pulse between two transducers. The pulse will arrive slightly sooner if the wind is blowing towards the receiver, slightly later if it's blowing the other way, but the differences are small so you have to compensate for other factors like temperature, perhaps air pressure and humidity. With 4 transducers at over $200 even before all your analog circuitry to generate the high voltage drive and sensitive receiver, this is not going to be super cheap!

You can still use it without problems for sensors.

if I logout the my.openhab.org account and stop openhab on raspberry pi then also open the UI application. what is the reason behind that?