Arduino keyer 1st attempt

Arduino Keyer 1st attemptLast night at the radio-club I did some puzzling for my 1st attempt to build the K3NG’s Arduino CW Keyer. I want to build one especially to train Morse code keying. Therefor I need a display attached to the keyer and some training software.
I have a Hoxo 1621 4-bit 16×2 display laying around so I want to attach that to the Arduino Nano. After a breadboard session and some soldering smoke I have made the connection. Gave my first Sketch on Arduino a go, downloaded the source code of the K3NG Arduino CW Keyer from Github and walked by all settings. When I gave the compile a try, it error-ed on some libs missing. After some copy + paste the code compiled without problems (white smoke!). But when uploading to the Arduino I got again errors. The IDE did not see the Arduino although all port settings where correct. By then it was almost midnight and I wanted to go home for some sleep.
This morning I gave the compiling a second try on my Ubuntu desktop. This time compiling and uploading went without errors! Hopefully I was watching the display, but accept for the back-light nothing appeared 🙁
I don’t know if I made a mistake with this 1st attempt in pinout or if the HOXO 1621 is too much of a difference from a 1602. But some further investigation has to be done. I will be back with a 2nd attempt.

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