Intro: Arduino ATtiny85 Programmer Shield on PCB Arduino projects are very popular but also big and expensive. There are programmer on arduino ide times that we don’t need so many input or output pins.
As a matter of fact, most projects could be accomplished with only 2 or 3 inputs and outputs. Besides the size, using one Arduino board for each small project can be costly. It is very easy to program the ATtiny85 using our own Arduino board based on the tutorial Arduino-based ATtiny programming published by MIT’s High-Low Tech research group. Arduino, so that the programming can be made easily and fast. 5V and Ground to pins 8 and 4 of the microcontroller and finally place a 10uF Electrolytic Capacitor between the Reset and Ground of the Arduino. In my project I have added an indicator LED on pin 9 of the Arduino that shows that the programmer is running properly and a reset tact switch for the ATtiny85.
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All this can be seen on both the schematics above. So by creating a small shield with all these connections, it’s easy to plug it on our Arduino and worry only about the programming stuff. The total cost is about 3 dollars without calculating the etching procedure you’ll follow. Etching solution like Ferric Chloride or Sodium Persulfate. Download the rar file that contains the files of the PCB schematics and some pictures of the circuit to be printed as silkscreen. Print the circuit on a glossy paper with a laser printer. As shown on the pictures it must be the negative version of the circuit.
Prepare the small part of one side copper board by scrubbing and cleaning it. It should be 6cm X 2. Put the printed paper on the board and press it with a hot iron. After 5 minutes, soak it in warm water, then peal the paper and you will have the toner transferred on the copper. If you want, you can find more info about this procedure by searching for Toner transfer method.
Prepare your etching solution by dissolving Ferric Chloride or Sodium Persulfate on water. Then place the board in it and wait for the etching to be completed. Be very careful with these stuff and if needed find more info about this procedure by searching for etching PCB. Clean the finished board and it must look like the last picture, with only the copper tracks – that where protected by the toner – left.