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Where are the ISCP contacts on this arduino uno r3?

I just got a drago youth shield. To connect it to my Arduino Uno, he says that I have to “shortcut” the contacts next to the reset button. http://wiki.dragino.com/index.php?title=Yun_Shield#Connect_to_Arduino_Uno

However, my arduino does not have those pins. IMG: Arduino

By the way, I thought I should not have done this, because before I successfully completed the Wi-Fi blinking sketch. When I tried to do this again, he returned this error:

avrdude: AVR device not responding avrdude: initialization failed, rc=-1 Double check connections and try again, or use -F to override this check.
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2 answers

In your picture, apparently, only the ISCP connectors are on the right.

enter image description here

In normal UNO, it also has a set of them next to reset, which is most likely for a smaller additional atmega (programmer) in regular UNO. As you can see, the one on the right should program the ATMega328p chip, which, as I thought, is what you could wish for, but after I looked at the Yun page that you indicated, I realized that it could be not what you want. It seems that you may have to remove the resistors and LEDs, as with "Connect to Dccduino UNO R3" on the Yun page. The best advice would be to see if you can get a circuit for your particular Uno and see how it compares with other boards.

enter image description here

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The idea is to remove several connections between the USB chip and the ATmega328P microcontroller. More specifically, you want to remove two consecutive connections, and one with the reset contact.

To do this with a resistor, you need to figure out what each resistor does, but this is difficult without having the circuitry of your board. What you can do is grab the multimeter and do this:

  • Put the multimeter in integrity check mode.
  • Check which resistors are connected to the RX TX pins in the Arduino header and remove them.
  • Check which resistors are connected to the reset pin in the Arduino header. Measure their resistance and remove the one that has a lower resistance.

Alternatively, simply removing the CH340G chip can also do the trick.

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Source: https://habr.com/ru/post/1241885/

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