Low-cost AVR programmer

Low-cost AVR programmer
For all AVR microcontrollers

                          This is probably the cheapest and simplest AVR programmer around....
                              (instead of an X-tal you can also take a resonator, this saves a bit space on the PCB)

Part list:
7x 220 ohm
1x 100 ohm
1x 22pf
2x 27pf
1x 100n
1x 47uF/16V
1x IC- or textool-socket
1x X-tal 4 MHz
1x 25 sub-D connector

Before using this programmer....

Be carefull with using this programmer, because it has no insulation circuitry! Especially when using high voltages e.g. 110/230 Vac on your project. One mistake and your day can be ruied, your expensive PC 

In-circuit or as a target:

You can use this programmer for in-circuit programming, or as a target programmer, the first diagram shows the target version, the second the in-cicuit version. In-circuit is very usefull when your hardware finished project needs to be fine-tuned.

Software:

Here you can downloadSP12. With this FREE (GNU) software from Pitronics you can upload the program in the AVR's flash memory. (type: Intel hex)

With WAVRASM from Atmel you can assemble your ASM code to e.g. name_of_program.hex.
(all AVR definitions can be found here)

How to make one ?

Follow the steps to make the cheapest AVR programmer there is:
(Why spending a lot of money, your project won't operate different when using this low-cost solution)

First solder the five 220 ohm resistors on the connector

Then the next 2 resistors like this

Strip the wires and solder them on the resistors and connector pins, write down what color what connection is, one mistake and it won't operate. (e.g. red = SCK = R on pin 2, etc.), or let the cover open and, connect the other side of the cable to a small PCB where the target uC will sit. (see next picture)

Fix the components on the PCB or hobby-board...

(20 pins IC-socket, ceramic resonator 4MHz, 10uF/16V)

All wiring connected, don't cut the rest of the wires, keep them as spare wires, if you ever need more connections or if have broken wires.

Here a homemade programmer, and it's working great :)




And not to forget, the wiring on the bottom

This is an extended version, now you can also program AT90S2323/2343/ATtiny's :)

Better to use these kind of IC sockets, after a year intensivly used I found out the cheap sockets are losing contact




Next, a low-cost programmer for the ATmega's