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Simple Mini Tesla Coil
ARDUINO_ POLAR V PLOTTER
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.
Wireless Communication Using Cheap 433MHz RF Modules and Pic Microcontrollers. Part 1
Receiving and sending data between Attiny85 (Arduino IDE 1.06) UPDATED Nov 2015
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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.
Super Cheap LED FloatieView Instructable »
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