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Topic: Wrong schematics for Arduino ISP (Read 1 time) previous topic - next topic


Nov 15, 2011, 05:58 pm Last Edit: Nov 15, 2011, 06:00 pm by jaara Reason: 1
Hello all,

I believe that schematics at http://arduino.cc/en/Tutorial/ArduinoISP and http://arduino.cc/en/Tutorial/ArduinoToBreadboard are wrong (the Arduino -> plain chip on breadboard). I tried to make this programmer and I found that the pins MISO, MOSI and SCK are reversed in the diagram.
Currently it is:
Arduino Pin 13 -> pin 17
Arduino Pin 12 -> pin 18
Arduino Pin 11 -> pin 19

and should be:
Arduino Pin 13 -> pin 19
Arduino Pin 12 -> pin 18
Arduino Pin 11 -> pin 17

At least it works for me :-)


I think you must have counted the pins wrong.  There are 28 pins so with #1 on the lower left, #14 on the lower right, #15 on the upper right and #28 on the upper left. From #15 you count up toward the left. #16 has no connection.  #17 is connected to D11 as you say it should be.  #18 is connected to D12 as you say it should be and #19 is connected to D13 as you say it should be.

Do you have your chip rotated 180°?  Then #15 would be on the lower left and your wires would have to cross to keep 17, 18, and 19 connected to D11, D12, and D13 respectively.
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Hmm, it seems you are right. I got confused somehow.. *scratching head..*

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