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Mysticism and Western Science (Brepols, 2008) (courses and lectures in The Netherlands) kami-bookQ:
What is the correct way to connect an Arduino with an ATmega microcontroller?
I've read that the data lines have to be connected in a certain way, but I just can't get it to work.
The ATmega is powered by USB from a laptop.
I have a 5V signal from the ATmega and a 3.3V signal from the computer.
The Arduino is powered with the computer through the 5V and 0V lines, and has the 3.3V line connected to the ATmega's reset pin.
What is the correct way to connect the ATmega's data pins to the 5V signal?
There are a number of ways to do this.
The most straightforward is to connect the data lines to 5V and 3.3V then connect the RESET and GND of the Arduino to 0V and GND of the ATmega respectively.
Another is to connect the data lines to 0V and 5V then connect the RESET and GND of the Arduino to GND and 3.3V respectively.
A third is to connect the data lines to 3.3V and 5V then connect the RESET and GND of the Arduino to 0V and GND of the ATmega respectively.
A fourth is to connect the RESET and GND of the ATmega to the Arduino and the data lines of the Arduino to the 5V and 3.3V respectively.
Any of these methods should work as long as they are implemented correctly and have a good connection.
I have used this method successfully with Arduino, the ATmega and an external resistor for any 5V input:
simulate this circuit – Schematic created using CircuitLab
For my circuit the ATmega is powered from the 5V source.
The ATmega has it's reset pin connected to GND.
When the input is connected to the ATmega's data pins the RESET pin is pulled HIGH.
If the input is connected to the ATmega's data pins and 0b46394aab