I've used I2C with a small RTC i bought, works fine.

But, i've been looking at SPI lately as it's a bit more involved but also a lot faster, so i've been learning the ins and outs, MOSI MISO Clock etc... and I'm starting to get the hang of it lol...


I don't understand the "addressable" side, if each IC that supports I2C or something that has an address (to tell it who you're talking to on the BUS line)  - surely you're going to run out of addresses right? for example who decides the value to begin with and what if another company who makes chips also use the same address?

or 2 devices with the same address ID on the same line? what happens then?

An oversized can opener should do the trick   



- As for moi, - I'd use a transistor (30cents? or so? from your local electronics store) ...  and 1 single pin from your arduino, a relay is overkill to simulate a button press (eg, the buttons you press to open/close the door).

I'm an unlucky but lucky kinda guy lol...

at 16, I decided to see how far I could make a hard rubber (high bounce ball) ball bounce, firing at it, while standing next to it, I aimed down fired... next thing i know i'm in severe pain clutching my right eye, turned out the 177 lead bullet hit the ball and decided to ricochet off directly into my eye..

Lucky thing was, it hit the bone just above my eye just below your eyebrow - I tell you what, that hurt like HELL....  and it taught me a valuable lesson, wear eye protection - which i never did do! - when firing over 7 feet away with an air gun I'm not that worried....

I've been in plenty of "what if's" one day i'll get unlucky... but that's the way i roll ...  I'm sure if you talk to enough guys who operate lasers and play with lasers at least 1 of them has only 1 working eye ball i still got a 2nd one

I'm curious...

For me, it's a tough call, I've broken multiple bones in my foot, broke my nose (jumping off a sand dune), even had a couple of kidney stones (several hours of pain)

BUT.

The most painful, I had an ingrown toe nail at about 11/12 and it got quite infected ewww, the doc was going to remove a corner of the nail, then i was just going to go home... ok so 20 years
ago now, the doc looked at it, went "hmmm" and decided it was too infected, he's simply going to remove the whole nail..

No injections.
No tablets
No pain relief ...

So he coats my toe in iodine, goes a funny shade of red/purple when painted on skin, i was watching what they did, then he tells me to lay back, so i did, and out come the heavy duty pliers and other surgical cutting tools and ..

WHOLLLLLLLLLLY FUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU

Imagine a coke can, the sound of the nail being ripped out sounded like a kid slowly pulling off a ringpull, not a quick pull, but a little bit at a time until it came out, I heard the nail ripping skin off, i felt everything, for a good 40 seconds of pain I can honestly say if there had of been more pain I think i would have passed out from the pain..

Next time you stub your toe hard and it hurts like crap, eye watering pain, take that pain and tripple it... that's how it feels yo have your big toe nail slowly ripped off without any kind of anesthetic or pain relief. - the more i think back the more i think he was incompetent.

http://www.hobbyprojects.com/unijunction_transistor/unijunction_transistor.html


A unijunction switches on at 0.5v, if so, use the resistors to give a 0.5v (ON) when the panel reaches say 5v, this ensures it to be switched on and be supplied with enough current for your 85.

I don't see unijunctions mentioned very often ever... why?

I was thinking about this...

And I decided that if i was going to attempt this, I'd have an analog circuit, using a voltage divider, that way when the voltage rises high enough (depending on the 2 resistor values), the base of your transistor will switch on..

12v --- 30k ~~~~ . ~~~~10k  ---0v
                          .
                          .___________ base will rise to 3v,  when the solar panel reaches 12v, the base of the resistor will be 3volts.

Collector/Emitter begin to flow, which can turn on the 85 safely, using this voltage divider, the solar panel has to reach 12v.


Change the values to suit your specific needs, but any reason why this would not work?  

or better yet!

Find a cheap assed power supply lol

Yesterday while cleaning up, I found the metal shell casing, nice and smooth except 1 corner where it must have hit the wall um.. hard

It's not cheap, it all depends on how big you want your plants, how much money you want to spend..

if the plants are not going to grow 6ft tall, and are as you say herbs, you might not need much power, if they are going to grow tall and huge, then 100watt + you're looking at to do the job.

http://www.ebay.com.au/itm/New-600W-Watt-Led-Plant-Flower-Ufo-Hydroponic-Hydro-Grow-Light-Lights-Lamp-200-3-/120953265255?pt=AU_Seed_Starting_Hydroponics&hash=item1c29605c67

fair enough... what about using the solar panel to do the job?




garden solar lights do this all the time.. how do they do it? voltage divider/transistor?

a unijunction transistor? or even a transistor and a voltage divider to only power it after a certain voltage >2v switch on or a voltage comparitor

i'd use a light diode resistor and a transistor... that way the transistor will only switch on when there's enough light to charge your lipo..

is it possible to create a memory segment fill it with executable code and then move the instruction pointer to the memory address and have it return?

if so would it not be possible to store executable code on say sd? think more like a dll.. calling libraries off of sd doing whatever and freeing the memory?

the debate arrises because nobody's certain which wavelengths plants respond to the mpst...

but

more wattage = better