Nokia E83

[Malene Mederios]

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It uses the PCD8544 controller, which is the same used in the Nokia 3310 LCD. The PCD8544 is a low power CMOS LCD controller/driver, designed to drive a graphic display of 48 rows and 84 columns. All necessary functions for the display are provided in a single chip, including on-chip generation of LCD supply and bias voltages, resulting in a minimum of external components and low power consumption. The PCD8544 interfaces to microcontrollers through a serial bus interface.

I am current considering use of this display but have not ordered it yet. I am a little hesitant due to the number of users reporting problems with these displays.I am in the process of creating a PCB footprint for this display, but when applying the 3D model provided, the hole spacing of the display's connector pads do not appear to be on a 0.100" grid. Is this an error in the model or are the display's connector pins on a weird spacing? If so, what is the spacing? Any help would be much appreciated.

I would say use your best judgement. I have only looked at the reviews under the review page and they all seem fine; unfortunately, I don't have time to comb through all +200 comments. That being said, you can check out our Technical Assistance page linked in the banner above and our returns policy. Another resource for you is the [forum] ], where you can check for what issues users had and if there was a resolution to the issue.As shown in the hookup guide the through hole header connections should be about a .1" spacing (image of connection into a normal breadboard). I've never used Blender and there person who made the models is no longer around to ask... so I can't speak to the accuracy of that file.

I had a project that needed some live data display, and looking for the cheapest low-power solution for our loggers lead me to the Nokia 5110 LCD. Once you get the backlight current under control, you can power the entire display from a digital pin, and if you use shiftout for soft SPI you can then get rid of the Reset and CS control lines. This brings the display down to any four wires you can spare on your build (incl. the power pin) and a ground line. This is much more manageable than what you see with the standard hookup guides if your mc is I/O limited like our pro-mini based loggers: -the-nokia-5110-lcd-to-your-arduino-data-logger/

I have a strange issue, when I run this python code first and then my C code, the code works perfect!But if I run my C code before the python code, I get no output. Logic says that the python code must be initializing something that I am missing in my code.Here's how I am initializing the LCD:

Magic indeed! I'm using a different approach for the RST (pull low as soon as possible, hold low for 100ms, then set high and continue) just as a matter of making sure I get a clean boot, but otherwise I end up using your init sequence verbatim. Saved me a ton of work since I'd been fighting with it for two hours.

Kuy - good info... A few comments:

(1) I confirm this intialization sequence works, with the clarification noted in #2 below.

(2) The second command byte (the 0xE0 shown above) is not arbitrary. It is 0x80, or'ed together with a 7-bit Vop value. I found my display to be somewhat sensitive to this value. At Vop=0xBF, my unit was initializing electronically, but had a blank display (or solid-black, I can't remember now.) Anyway, I had to play with this value, and 0xB3 ended up working for me, so if you are initializing to this sequence and having trouble, try varying this parameter. The technical details of this parameter are explained in the datasheet, section 8.9, but really, you will just have to play with it.

(3) I didn't find reset/init to be all that tricky, but it's possibly because I'm powering the display unit from a port pin. That's right, it only draws somewhere around a mA or less, so I just use an output-configured port pin to run the display VDD. (This lets me turn off the display easily when I want to go into low-power Sleep mode on my micro.) So I let my micro do it's own reset sequence with all my port pins (including Display VDD, !Reset, and !SCE) at "0", and when I'm ready, I set, in sequence:

VDD = 1

!SCE = 1

!Reset = 1

These end up coming in a 1 us per instruction sequence (running a PIC 18F at 4 MHz.)

Note the datasheet says reset can be low when VDD is applied, and then has to be at least a 100ns "low" pulse. So powering up VDD, then applying !SCE at 1 us and !Reset at 2 us meets that spec just fine. I have had perfectly consistent startup operation with this sequence.

(4) !SCE tied to ground - yes, you could, but I've had fine results framing each byte with the !SCE signal - there's nothing wrong with that. Yes, framing a whole transaction is fine, too. Note the datasheet timing diagrams show that !SCE serves a reset function on the incoming serial shift register, so if you ever get a glitch in your serial transmission that gets the bit count off, respecting the !SCE timing (whether on byte- or transaction-basis) will automatically get the display controller's serial receiver synchronized back up on the next byte or transaction.

(5) If you are using a PIC to run ths thing, and using the PIC's USART or EUSART in a synchronous mode, be sure to note that the LCD controller expects the MSBit of each byte to be transmitted first on the serial line. The PIC 18F EUSART transmits the LSBit first. For now, I have lots of extra code space, so I've wasted a 256-byte section on a lookup table that reverses the bits in a byte. This way, I just write my initialization code normally, and I have a TransmitCommandByte() function that looks up every byte it sends so I don't have to think about that.

Once I get to a final version (or at whatever point I need to conserve code space) I'll just establish my final command sequencing, and hard-code in the bit-reversed values so I can get rid of that lookup table.

As a separate issue from the command bytes, all my graphic data are already created with the proper bit orientation, so I don't have to look them up to do the reversal.

It may be possible to compensate for the low voltage by tweaking the contrast or updating slowly, but in my testing about three years ago journeys beneath 2.0V led to the display whiting slowly out like the face of an inexperienced fighter pilot in an aerobatic manoeuvre.If you want a great low-voltage LCD consider a Sharp memory LCD. Pebble uses one.

Thanks for that sequence, worked perfectly!Advice for others: It took me quite a while to get this working on an ARM Cortex. Since there is no way to read from the LCD, it is very hard to know if SPI is working without doing everything perfectly. SO:Use the contrast value that Kuy gives (0xE0) or darker - this will cause the display to be all-black so you can confirm it works. THEN you can adjust the value and focus on getting characters to write.

I ran into an issue with the "Example Code." I noticed that the screen was not properly displaying Hello World! [the output was "Hfmmp Wpsme!"]The fix is to add a spacer [","] to the ASCII setup code like this...

Problems with my DisplayI just want to share my experience, maybe it can help others.I bought my display from eBay. A dirty cheap bargain from Hong Kong. I must say that it is exactly as the SFE breakout board, but of course, it didn't work.The problem I had was solid black display screen. No matter the combination of bias and contrast values that I set. The unit wasn't totally defective, because under a strong lamp light you could see the display trying to show the letters and pictures that are in the tutorial for Arduino that I got from SFE.Finally, after a long time of trials, I fixed it--> The problem: the bezel wasn't tight to the board, so the contacts of the display didn't work well.Conclusions: You get what you pay, don't expect well manufactured products and tested components comming from China at half the price you pay here. And second, it is totally no good idea to start up a new development with new technologies with untrusty material. Maybe you can try some cheap components after you are sure that you are used to certain technology (a display, a sensor, whatever), but don't try to break the barrier of new knowledge and tricky materials at the same time; because you won't be able to know who is the faulty.

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