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Tools and Materials for Arduino
Welcome to Arduino
Interface an SRAM bus to your arduino
Hydroponics and Aquaponics ...View Instructable »
Arduino UNO as AtMega328P Programmer
Programming an ATTiny13A using Arduino & servo interpreter
How to Program ATtiny2313
Tacuino: a low-cost, modular, Arduino-compatible educational platform
Realistic Flickering Flame Effect with Arduino and LED's
DIY Arduino Pulse Sensor
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
Mini weather station with Attiny85
Captain America Shield
Throwduino Basic - Light-Sensing Flashing Throwie with 1 Added Part - Now with Morse Code
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 »
Joule Thief LED Night Light
Cast Metal Inlay into a Wooden ring
Natural Mood Enhancers
Outdoor MakeKit v2.0
ESP8266 as a Microcontroller
Connecting ESP8266-01 to Arduino UNO/ MEGA and BLYNK
An Improved Joule Thief--An Unruly Beast Tamed?
The World's Smallest 4x4x4 RGB LED Cube
10 Resistor Arduino Waveform Generator
Protopiper: physically sketching room-sized objects at actual scale
Make the best tweezers around
IGRUN - Daughter of Aetheria. A High Voltage Steampunk Lamp
Make A One Desk Electronics Lab (in a small place, for beginners)
All You Need to Know About LEDs
A beginner's guide to Arduino
The 72 Plant Vertical Garden
The Hydroponic, Automated, Networking, Climate Controlled Greenhouse Project: Construction
Supercapacitor Programmable Attiny LED flashlight
How to build a simple Twilight Photometer
TV Out with Arduino
DIY a Wi-Fi Speaker
Wooden Christmas Cracker
Measure Li-ion cell capacity with an arduino
Solar-OSE: Solar concentrator for steam generation
Temperature Displayed on 4 Digit 7 segment (common anode)
The 74HC164 Shift Register and your Arduino
Arduino Battery Shield
LED matrix using shift registers
Using The PCF8575 i2c i/o Expander To Read Inputs With Arduino
Web controlled socket by Arduino
ESP8266 Wi fi module explain and connection
All-in-One Raspberry Pi Getting Started Guide
50,000V High Voltage Power Supply
Wooden tin with threaded lid
Reuse the whole thing: Glass bottles
See the Signals of Your Phone
Crystal cMoy Free Form Headphone Amplifier
Steampunk Box Lamp
Measure Capacitance with Arduino
DIY Bean Bag Couch
Shockeration (Modified Operation Game)
Arduino Frequency Detection
WIRELESS 555 timer mouse modification
LED fading with a 555 timer
Plasma Display Steampunk
Mini high voltage supply
Arduino-based Switching Voltage Regulators
How to solder aluminum.
HACKED!: Flickering Light Bulb for Halloween
DIY Constant current load
Embossed Foil Wall Art
Quad Track Arduino Robot
6WD robot with aluminum chassis
Clothespin Trip Wire Alarm
Spooky Tesla Spirit Radio
The Tiny Book Pendant
Speech Recognition with Arduino
Zinc & Copper Pendant
Glowing Mushroom Wooden Ring
Construction of a Steampunk Light Tube
The One Ring
Wire Wrapped Wrap Ring
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