@meanmrgreen See my post a few up, I'm seeing some weird effects when connecting to more than one plant..

@mfalkvidd I'm going to do some tests with changing the sampling time and sleep time, but I'm not so hopeful since the effect is seen hours/days after an "unrelated" change.. I got stuck yesterday playing with ESPEasy, but I'll get back to debugging this..

I have an arduino pro mini, connected to 2-3 flowers using A0+A1, A2+A3, A4+A5.. unfortunately, I'm seeing some weird effects between the plants.. if I water one plant, another can change a bunch at the same time (or not, depending on stuff).. Also if I disconnect one flower, another flower can get way different values too..

I haven't figured out yet if I'm getting a capacitor effect in the flowers, sending back power through the output signals or what's happening..

Here I added water to the "green" flower, then the values for the gray one dropped. The gray one was physically untouched while watering.

Code is based on mfalkvidd, with all Ax being set to output=0 and then input+pullup for one while reading..

Lower the speed from 115200 to 19200, 9600 or similar. The frequency of the arduino is not able to match 115200 baud exactly, so the arduino and rpi are mis-communicating.

From another thread; http://wormfood.net/avrbaudcalc.php?postclock=8&hidetables=1

Solved it for me.

At http://www.kandrsmith.org/RJS/Misc/hygrometers.html there is a lot of tests on various hygrometers, like dht22, si7021 etc.

A useful comment if you are measuring quite seldom can be found at;
http://www.kandrsmith.org/RJS/Misc/Hygrometers/dht22_other.html
namely, that upon "measurement" DHT22 actually returns the previous measurement from memory - then actually does a measurement and stores that in memory.
If you poll once per hour, you get one hour old data every time. Poll twice, or poll "often enough".

@Pierre-P
That i2c thing is painted and works because it's capacitive (it can even sense when your finger is hovering a millimeter or two away from it, like a capacitive touch screen (your phone)). I put one of them into the soil yesterday. If I remember, I will get back regarding results.. I placed it into the same flower as a resistive fork, with the middle chip (so I have some corrosion).

When I arrived at work today and started checking mails, I had received a bunch of them saying that the temperature in the fridge was too high, so I had to drive home and close the door. I would have gotten a notification earlier through jabber if the server software we use for jabber wasn't acting up :(.
MySensors stuff was not involved in that particular sensor (esic sensor + tellstick + perl + perl), but the need to monitor this stuff was definitely there.

.. and you can be prosecuted for putting others in danger etc.

@MikeF Maybe an idea about turning on the display.. how about adding a PIR, and turn on the display if movement is detected..? My guess is that it'll lower the power consumption, and still show info when someone is nearby.

What are you using the high baudrate with? Due to clock frequencies etc, the pro mini can't even generate (actually, read) 115200 baud correctly..

Without further info, it looks like a case of "Doctor, it hurts when I do this" "Well, don't do that then.." ;)

@Sparkman I asked them what to do about the situation, and they said "we'll send 10 new". Should arrive soon..

@NeverDie Yes, I've tried various things. The modules from gc_supermarket were crap. I ordered 10, so it's not an "oops, you got a bad one".

1420JB.

In the ebay shop, the module PCB had markings. The ones I got had none.

Using a non-scientific method; looking at the angle of battery discharge graphs over a week, I've noticed that the modules I got from ITEAD are draining batteries at about half the rate compared to an unknown (but probably fake) pretty good module.
ITEAD module; slightly under 1% per day
"other modules"; about 2% per day
This is when measuring and transmitting DHT21 data every minute.

@m26872 .. which is default for most. My battery used to cut off slightly over (readVcc-measured) 2.7V, now they're down to 2.6 after changing BOD level to 1.8 instead. Requires external programmer like USBtinyISP or so.

I bought some modules from gc_supermarket which had "antenna symbol" on one side and pinout markings, marked "GOOD QUALITY". Reality was all thrown into a single antistat bag, no markings at all and crap transmissions. I confronted them (after ebay feedback timeout had passed), and they replied "We may send you another 10pcs" two weeks ago. Waiting to receive them.

I got a batch from ITEAD, with good packaging (individual box+antistat+foam) and the two I've tested so far are surely the best I've had. I can place sensors in my car on the driveway, signal getting into the house (passing through large parts of the engine, metal sheets, thick house walls, inner walls, ...).

how about 2 or 4MHz if 8 is too high?

I'm trying to get gc_supermarket to refund me or send working ones.. the nrf's I got from them, marked "GOOD QUALITY" has a range of a few meters in open space. Cap adds another meter or so.
I've ordered nrf's from itead too, hopefully good ones.

Was the node awake and listening? st=fail means transmission to that node failed (no "ok" back).
If it's battery powered, it's probably sleeping with radio off.
One trick seen in another thread; after the node has sent data to the gateway, listen for like 200ms for any incoming packets. In the controller; keep the reboot packet on hold until you hear from the node - then quickly send it.

The raw connector can handle about 3.3-12v (or 5-12v for a 5v arduino), so 5V should be fine. If you have a wall plug that should give "12V", it might give a whole lot more under low loads (such as a measly arduino) - I've burnt more than one regulator with that.

Ok, so the following stuff isn't 100% correct anymore I guess.. (it's not Protocol.. and I've wondered for a while why each sensor is reporting the same library version as the rest and the node itself..)

https://github.com/mysensors/Arduino/blob/master/NodeJsController/NodeJsController.js#L588

I'm not using this one, but rather a perl controller inspired by this.. Work In Progress..