ATtiny 85 

This Instructable web site is for Electronics inthusiasts who like to learn about 
I like to share my inthusisam with you and make projects with the smallest of all micro controllers. Many episodes will follow to show and tell how this mini ATMEL ATtiny 85 -20PU micro controller works and what to do with it.

WHAT is ATtiny 85

The high-performance, low-power Atmel 8-bit AVR RISC-based microcontroller combines 8KB ISP flash memory, 512B EEPROM, 512-Byte SRAM, 6 general purpose I/O lines, 32 general purpose working registers, one 8-bit timer/counter with compare modes, one 8-bit high speed timer/counter, USI, internal and external Interrupts, 4-channel 10-bit A/D converter, programmable watchdog timer with internal oscillator, three software selectable power saving modes, and debugWIRE for on-chip debugging. The device achieves a throughput of 20 MIPS at 20 MHz and operates between 2.7-5.5 volts.
By executing powerful instructions in a single clock cycle, the device achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and processing speed.
Daniel Dusentrieb


The pin out of the ATtiny 85
We have 3 input pins labeld A . A1 A2 A3
And two PWM pins.0 and 1 when we program.
The physical pin on the chip is different as shown in the picture 5 and 6.
PWM (Pulse Width Modulation) refers to the concept of rapidly pulsing a digital signal on a wire. Along with many other uses, it can be used to simulate a varying static voltage. PWM is commonly used for driving motors, heaters, LEDs or lights in varying intensities or speeds.

Many manufacturers make boards for this chip in many shapes and sizes.

Often manufactureres use the surface mount  version.
They all have one thing in common.
Even if they provide a USB input, they can not be programmed with USB.
The USB only provides power to the circuit.
Those can be found on eBay from many Chinese manufacturers for a few dollars, but no seller provides any instruction with their product.
That is where we come in and help with our instructables on how to.
A small dot on ship is for the orientation.
If plugged in the wrong way you short them out. Notice the small dot on one side of the IC. 
Some experienced kit sellers make a nail polish mark on the chip. 
It has two advantages. 
·        ​It can be seen in low light levels
·        the kit seller knows that chip has been programmed
·        The end user can see easily which way around to insert the chip.
Make a Battery saver, cut-out switch.
NEXT The new EMF detector is set to 50 HZ. It detects magnetic fields as your power line inside  a wall.