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What is a 3.6 volt battery? The instructions use a 9 volt battery. perhaps you're referring to the 18650 battery mentioned in the author's comment? If so, if you read the comment carefully, you will see that he is not suggesting that the 18650 could be used in this circuit, but merely stating that some commercial chargers use such a battery.
One thing I would point out to you; in your schematic there is no resistor on the LED, but in your actual circuit there is one. I would suggest updating your schematic to avoid the rather aggressive comments of those with less patience for beginners.
There's no need to be rude. It's not bad advice at all. I won't say that this is a particularly efficient charger, nor will it give much of a charge to any modern device, but it is quite safe. So long as the connections are made correctly, something you must always be careful with in electronics, this will charge any USB device without worry. Modern devices may 'reject' it and refuse to charge, though in reality they still charge, just very slowly.
RF 315/433 MHz Transmitter-receiver Module and Arduino
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No, the converter boosts the voltage at the expense of the current. Your panel looks like it is a 0.1 watt 2 volt model. That means that the maximum current you'll get out of it is 50 milliamps. To get from 2 volts to 5 volts, the voltage is boosted by 250 percent, meaning that the current is reduced by 250 percent. This gives an output current of about 20 milliamps. An average smartphone has a battery of about 2000 milliamphours, meaning this charger would take about 100 hours to charge a phone, assuming there are no losses in the system at all, which is not true, so realistically, it would take at least 150 hours to charge a phone with this. Great for concept, but not for practice.
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Believe it or not, it actually doesn't smell. Perhaps it's the soap in the water. However, after about a month unattended, a trap I had forgotten about collected dozens of stink bugs which then liquified and solidified into a horrible stink bug hockey puck. That did stink.
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Good end product, but it needs more explanation, perhaps divide it into more steps and go into better detail.
I don't want to be rude, but none of these are even remotely LEDs. They're crude incandescent lights. LED stands for light emitting diode, these aren't at all diodes. Cools idea though.
RC Fireworks Truck
So what I've found out is that the error basically means that the Arduino doesn't know the Attiny is there at all. I had this issue about three months ago and I haven't messed with the Attiny until yesterday, and it worked just fine. Unfortunately, I can't help you out because I have no idea what I may or may not have changed. I can tell you that I'm using the Arduino v1.6.8 IDE from Arduino.cc (not Arduino.org) with the 1.0.1 attiny. I wish I could be of more help.
How familiar are you (or your friend) with Arduino? I think the way to go would be to use a RTC (Real Time Clock) to keep track of the time, then it would be simple to enter your schedule and have it turn on and off the relays when you want them to.
If you're still working on this I can try to be of some aid, but I have a few questions first. When you say 5-80v, is that open circuit voltage? Meaning are you simply putting a voltmeter across it to measure? Also, what kind of current can you get from it? You want to charge 4 series 20Ah lead acid (I assume) batteries, so you'll need a good amount of current.
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