OLIMEXINO-328 with NHD-0216SZW-BY5-51481

Hi guys I am quite new to arduino in general, so please excuse if i ask something trivial but searching the web didn’t lead to success. :confused:

I am using a Newhaven Display NHD-0216SZW-BY5-51481 connected directly via 22AWG jumper wires to an OLIMEXINO-328 which gets powered via the USB-port of my notebook.

this i my source code:

#include <LiquidCrystal.h>

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal disp(rs, en, d4, d5, d6, d7);

void setup() {
disp.begin(16, 2);
disp.setCursor(0, 1);

void loop() {}

“Test” gets written to the display but then the led 13 blinks 7 times and the board seems to reset.
After this not intended “reset” the screen often shows a bunch of random/magic values (always the same actually).

Has anybody an idea what might cause this?
Thanks already in advance for every helpful though/answer. :slight_smile:

I tried it now by powering it with a USB power supply.
In this case the described above doesn’t happen.

By pressing the reset button several times i can reproduce it (with each press the LED blinks once).
So my question is now how does it come that after some seconds (~5) I get from the usb port of my laptop some signals which cause the OLIMEXINO to to reset 7 times?