Author Topic: How to reset NHD-0216SZW-BY5?  (Read 180 times)

a_horst

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How to reset NHD-0216SZW-BY5?
« on: April 06, 2018, 08:25:11 AM »
Hi guys,
I got a NHD-0216SZW-BY5 connected to a Arduino similar board and use the LiquidCrystal library like in your example code.
Basically i have no troubles to get output on the screen. Only when i reset, upload new code or plug out and in the supply too fast, it starts writing at the wrong position and/or magic numbers.

Due to this I guess the content in the RAMs is not lost fast enough.

So my question now would be - what commands would I have to send initially to the controller to avoid this?

Thanks already in advance for every helpful though/answer. :)

Saurabh_B

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Re: How to reset NHD-0216SZW-BY5?
« Reply #1 on: April 11, 2018, 08:08:16 AM »
The first thing you would have to do is to add a short delay when the power is applied.
Then before you start writing I would recommend sending the return home command.

There is also a clear display command that would be able to "reset" the screen to a blank state and move your cursor to the home position as well.

I would recommend adding delays to the end of your write functions. The max execution times are listed in the instruction table.
Page 7 (http://www.newhavendisplay.com/specs/NHD-0216SZW-BY5.pdf)

a_horst

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Re: How to reset NHD-0216SZW-BY5?
« Reply #2 on: April 12, 2018, 04:50:57 AM »
Unfortunately this doesn't leads to success

As i noticed in the datasheet at the end a section "Initialization Sequence", do I have to apply this sequence always when turning it on?

Or can I assume that like the "HD44780" and identical controller, it has a internal reset circuit, which (when power is turned on) initializes it to the following:
1.   Display clear
2.   Function set:
    DL = 1; 8-bit interface data
    N = 0; 1-line display
    F = 0; 5 8 dot character font
3.   Display on/off control:
    D = 0; Display off
    C = 0; Cursor off
    B = 0; Blinking off
4.   Entry mode set:
    I/D = 1; Increment by 1
    S = 0; No shift

 

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