Dear All, Can anyone please provide links for: 1. Complete sketch (from start to end) using ST7920 Controller for this Parallel/serial selectable GLCD (128x64) according to this GLCD's specific pinouts (see below) and 2. The full Pinout for the Mega2560 Board connecting this GLCD; There are numerous sketches and very different 128x64 GCLD's Controllers out there BUT none seem to be for the above combination.
Or the information that is available is only discernable by one who is fully conversant with the programming languages. I have located the Datasheet, (DS) for the ST7920 controller - and readers looking for this information need to be aware there are various publication dates for this specific DS ranging from Oct 2002 to Aug 2008 and possibly later as well, and they can be substantially different or don't include the same pin assignments - which adds to both the difficulty in trying to nut this out yourself and creates even more confusion since almost all these 'other' GLCD's use two pins, CS1 & CS2 instead of a single pin, E? The correct pinout for my 128x64 GLCD which carries the only identifying feature of J12864 followed by two chinese characters is: Pin 1 - GND; Pin 2 - Vcc; Pin 3 - Vo; Pin 4 - RS; Pin 5 - R/W; Pin 6 - E; Pin 7 to Pin 14 - DB0 to DB7; Pin 15 - PSB (Parallel-H/serial-L select); Pin 16 - NC; Pin - 17 RST; Pin 18 - Vout; (from internal voltage doubler); BLA (Backlight annode); Pin 20 - BLK (Cathode). I hope someone can please put me out of my misery and point me in the right direction.
I have, I believe thoroughly chceked(??) both the Arduino and Adafruit sites but to no avail??? Hi Oliver, Thank you again for your quick reply. I am however a tad confused with some of what you have said, eg,; '. Connect E, RW, RS and RST with some GPIO ports of your board.'
I understand the GPIO Serial?? ports on the Mega2560 to be TX/RX pairs - pins 14 to 19? Are you suggesting that 'E' should connect to (say) TX3 (Pin 14); 'RW' connects to RX3 (Pin 15); 'RS' to TX2 (Pin 16); 'RST' to RX2 (Pin 17) I also presume that pins DB0 - DB7 on the GLCD will be connected to Mega2560 digital pins (say) 21 - 27??? I have looked at the U8glib and have located the appropriate line to 'uncomment' but need the above to be clarified first. There is also much confusion with a great many of the available sketches (not necessarily the ST7920 controller) on whether a resistor should also be put in series with BLA (220 ohm is suggested when using +5V) in addition to including the variable pot (10K??) to control contrast on Vo? Appreciate your clarification please. Also is there a completed sketch available for both the serial and parallel operation of the same GLCD - if so this would go a long way to seeing what the actual code differences are for both serial and parallel code - and therfore this too would help eliminate confusion arrising from the different codes (serial/parallel) for these different modes of driving the same GLCD?
St7920 Datasheet
Regards, Ian. Hi GPIO = means 'General Purpose Input/Output'. You can use any four pins of your board.
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It does not matter which you use. The good thing about serial mode is, that you do not need to connect DB0 to DB7. See my picture. I have only connected four lines (white wire) with my Arduino board.
Uncommenting a line in u8glib might not need to be enough.You might need to modify the arguments (=pin numbers) of the constructor call. BLA and BLK usually is the power supply for the BackLight LED. It will require an additional (fixed) resistor. 10K should be fine for the variable pot. Without the datasheet of your display it is difficult to say something reliable, but in general the wiper should be connected to v0.
One end to GND and the other end to some negative voltage. Thanks once again Oliver, Re GPIO's - do you mean you can use 4 x digital or 4 x analog pins for these connections or any combination of either, and not the use the TX/RX pins at all? Re Uncommenting the U8glib line might not be enough - I was wondering about this as I could not see anywhere in U8glib code where 'E, RW, RS and RST' were being defined with respect to which pin numbers were connected to Mega2560 pins??? Do you have an example code line for this specific process of 'telling the code which Mega2560 pins are being used'? I could not see any other similar example in any of the various U8glib code statements that I could see here, either? By the way, I uncommented the code which still only showed the parameters 'E, RW, RS and RST' as these alpha characters but had not substituted any Mega2560 pin numbers and then compiled the code - which compiled OK showing no errors! Not yet sure what will happen once I substitute the pin numbers, though?
I have attached the Controller (ST7920 DS) which I believe is in my GLCD but I have not yet located a GLCD DS - I have been chasing the seller of the GLCD to provide both - and we all should hound any seller who doesn't provide this basic info for our purchases, or go to another seller that does provide all the required data although these can be few and far between - and he has just sent me an hour ago the ST7920 DS - BUT WAIT - IT IS ALL IN CHINESE, OF COURSE - and therefore NBG, which I have just let them know!!! So I am still only guessing that my GLCD has the ST7920 in it and as yet have no idea whether or not a BL resistor or its size, is required? Thanks once again Oliver - and this time SUCCESS using your U8glib code! I have attached 3 pictures showing the GLCD working, the Arduino Uno wiring and have included the description of what I did to achieve this for anyone who might be interested in using the 128x64 GLCD! This monochrome display is an excellent GLCD and shows very crisp alpha-numeric characters.
The graphics capability is also quite good. It was very cheap at Aus. The Code: I used U8GLIBST7920128X641X u8g(E, RW, RS, RST); and using the Arduino Uno pins as shown here; U8GLIBST7920128X641X u8g(13, 11, 10); RST GLCD pin 17 was not used as the GLCD worked whether or not RST was connected. I am not sure whether not connecting the RST has any adverse consequences. The one adverse observation noted with this particular code is that it takes a very long time for this code to compile and to upload! Could not connecting the RST be causing this slowness?
![Sims 3 serial code Sims 3 serial code](/uploads/1/2/3/7/123799508/570269889.jpg)
Uno Wiring: Parallel/serial select PSB GLCD pin 15 was connected to GND bus, which sets the display in serial mode. Arduino Uno +5V connected to breadboard bus; GND connected to breadboard -ve bus. In my case I used a single 220 ohm resistor connected from +5 bus through the resistor to GLCD pin 19, BLA just to be safe and protect the GLCD backlights, and -ve bus to BLK. I also used a 10K pot as follows; one leg of the pot connected to +5V and the other to GND while the wiper was connected to GLCD Vo pin 3 - the GLCD contrast control. (See below for additional comments on display contrast control). GLCD GND pin 1 was connected to -ve (GND) bus and GLCD Vcc pin 2 was connected to +5V.
And that's it!!! Back of the GLCD: The third picture shows the components on the rear of the display. Of special interest is VR1; a 7.2K variable pot shown as the 'screw' beneath the R1-R5 header.
I believe this pot is a built in display contrast control but as stated in my previous post I have not been able to obtain the Datasheet for this GLCD and have only thus far obtained the ST7920 Controller DS. Below VR1 is jumper pad JP3 which itself is not bridged across this jumper pad. Jumper pad 3 connects with VR1 and is, I believe, the means of switching VR1 into or out of the circuit. Since I have not obtained the GLCD datasheet I am not sure whether VR1 is presently activated so if anyone knows how VR1 (and I am not game enough to just try it without knowing what it does) and JP3 are operated I would be very grateful to know this. I would be equally interested to learn what R1-R7, R10 and JP1, JP2 and JP4 are controlling? I hope the above description helps anyone who is struggling to get their head around this GLCD!
Idm Serial Code
//////////////////////////////////////////////////////// The library has been created by Markos Kyritsis, it is (of course) copyleft, which means you can take it and do whatever you want with it. But please, please, if you optimise it in any way, then contribute to the community and upload a copy for everyone else =D Forum discussion here: //////////////////////////////////////////////////////// Here is a list of issues with the current version of the library:.
Although you can draw graphics on both screens by issuing 1, or 2, when calling the RenderScreenBuffer method, you can't draw any object that starts in screen one, and ends in screen two. Its either all on the top screen, or on the bottom screen. You also HAVE to draw screen 2, before screen 1.
Otherwise everything gets wiped. Also, you can't draw a cropped part of the second screen yet (cropping is only supported on screen one). It can switch from graphics to ASCII mode, but the value for the positioning is very strange.
It seems non-linear (haven't had time to check this). Its a little slow, but I managed to make a both a Pong game, and a side scroller for it, so its not that bad (You can download the pong game below). If you need to see the code for the side scroller, just send me a message on the forum above.
Specification Gross Weight (kg) 0.1250 Manufacturer EastRising Continuity Supply We promise the long term continuity supply for this product no less than 10 years since 2015. Shipping Carriers We cooperate with DHL,UPS,FEDEX, TNT,EMS,HongKong Post and Singapore Post for shipment and choose the most appropriate one for the destination. Shipping Time Please use the chart below to help how long it will take to recive your order. Rates A shipping cost estimate is displayed during online checkout based on the 'Ship to' address you provide. If that estimate is significantly lower than the actual cost determined after your order is packed, we will notify you by email and wait for your approval before shipping.If significantly higher,we will reduce your shipping charge. Charge for Packages Returned or Rerouted In addition to the original shipping cost, we charge you for packages returned to us or that require rerouting when caused by your error (for example,providing an incorrect shipping address) or refusal of a package. 5.Customs and Import Duties Customs fees and import duties for exports are your responsibility.
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Description ERM12864SYG-6 is yellow green background with 128x64 monochrome dark blue pixels,ST7920 controller that is built-in Chinese character,6800 4-bit/8-bit parallel+3-wire serial spi interface,single led backlight with yellow green color included can be dimmed easily with a resistor or PWM,stn-lcd positive,wide operating temperature range,rohs compliant.Optional 3.3V or 5V power supply. It's easily controlled by MCU such as 8051,PIC,AVR,ARDUINO,ARM and Raspberry Pi.It can be used in any embedded systems,industrial device,security,medical and hand-held equipment. Of course, we wouldn't just leave you with a datasheet and a 'good luck!' .For 8051 microcontroller user,we prepared the detailed tutorial such as interfacing, demo code and at the bottom of this page Datasheet - Graphic LCD Module,Controller IC ↓.
//////////////////////////////////////////////////////// The library has been created by Markos Kyritsis, it is (of course) copyleft, which means you can take it and do whatever you want with it. But please, please, if you optimise it in any way, then contribute to the community and upload a copy for everyone else =D Forum discussion here: //////////////////////////////////////////////////////// Here is a list of issues with the current version of the library:. Although you can draw graphics on both screens by issuing 1, or 2, when calling the RenderScreenBuffer method, you can't draw any object that starts in screen one, and ends in screen two. Its either all on the top screen, or on the bottom screen.
You also HAVE to draw screen 2, before screen 1. Otherwise everything gets wiped. Also, you can't draw a cropped part of the second screen yet (cropping is only supported on screen one).
It can switch from graphics to ASCII mode, but the value for the positioning is very strange. It seems non-linear (haven't had time to check this).
Its a little slow, but I managed to make a both a Pong game, and a side scroller for it, so its not that bad (You can download the pong game below). If you need to see the code for the side scroller, just send me a message on the forum above.
I recently bought this GLCD: It should work with the LCD12864 Library in the Arduino Playground (but I have no idea how to wire it to the Arduino In the LCD12864 library documentation says i needed to connect these pins: EN = Arduino Pin 18 RS = Arduino Pin 17 RW = Arduino Pin 16 D7 = Arduino Pin 7 D6 = Arduino Pin 6 D5 = Arduino Pin 5 D4 = Arduino Pin 4 D3 = Arduino Pin 11 D2 = Arduino Pin 10 D1 = Arduino Pin 9 D0 = Arduino Pin 8 CSEL1 = Arduino Pin 14 But the LCD I bought has different pin names so I don't know what goes where. Here is a picture of the back of my LCD: (Click to enlarge) As you can see it has the pins: VSS VDD V0 RS R/W E DB0 - DB7 PSB NC rst Vout A K I'm taking a guess that E from the LCD12864 Library documentation corresponds to EN and R/W corresponds to RW but I don't know which pin corresponds to CSEL1. Basically what I'm asking is for a wiring diagram to connect the GLCD in the image above to my Arduino UNO, any help will be appreciated immensely as I'm just itching to get this up and running. This looks like an interesting display but you need better documentation. The LCD12864 library documentation says: You also need to connect a POT with 5V on one side, ground on the other, and 5V (perhaps with 150 Ohm resistance) + LCD Pin 19 to the wiper (middle one usually). Otherwise you won't see much. This is total gibberish.
Typically the V OUT pin (almost always pin 18) goes to one end of the pot, V SS (pin 1) goes to the other end, and V O (pin 3) goes to the wiper. The LCD12864 library documentation says: If you need to change these values, you can find them in the LCD12864.h file. I tend to put CSEL in pin 12 in order to get the extra analog pin for joystick connections, etc. When you look at the.h file there is no reference to the CSEL pin. When you look at the.cpp file you will see that the constructor only has 11 values in it's argument and CSEL is the missing one. I think mindkits should supply you with some better documentation. Specifically, you need documentation for the QC12864B board rather than for the ST7920 controller chip which is allegedly under one of the epoxy blobs on that board.
Perhaps someone who reads some of the Asian languages can help you with this part since a Google search for 'QC12864B' does not turn up any English language results. Normally I would doubt that the pin that is used to switch between a serial and a parallel input (PSB) would be implemented by a connection clearly labeled as a chip select (CSEL1), but see below. I doubt that either would need to be driven by an 'analog' pin.
My previous comment about the.h and the.cpp files 'When you look at the.h file there is no reference to the CSEL pin. When you look at the.cpp file you will see that the constructor only has 11 values in it's argument and CSEL is the missing one.' Were based on following the link provided by mindkits.
The corresponding.h file on the Arduino site does indeed provide for CSEL1 and in the.cpp file all the program does with this pin is to drive it high, which when connected to the PSB pin will put the display in the parallel mode. There are lots of commented out references to CSEL1 and CSEL1 which leads me to believe that the author cobbled up another GLCD program to deal with this display. His technique provides an excellent example of how to waste the resources of an output pin. Without a datasheet for the pc board we are just guessing.
It would be nice to know what voltage is supplied by pin 18. Try moving the one lead from V SS to V DD. This means that one end of the pot is on pin 2, the other on pin 18, and the wiper is on pin 3. Typically for character mode LCDs you should have a slightly positive (with respect to V SS) voltage at pin 3 and for graphical LCD you need a slightly negative voltage. This connection should enable you to achieve either, assuming that pin 18 supplies a negative voltage like most GLCDs.
glowEDIT /glow It appears that this device requires a positive voltage on pin 3, perhaps as high as 7 volts, which must therefore be supplied from pin 18. This would mean that my original connection information in Reply #1 was correct. Hello, I'm trying to wire up the ST7920 display, but I'm intrigued about the fact that the library says that you must connect, for instance, EN to Arduino pin 18. How would it be possible on an Uno, since it has just 13 digital pins? There's probably an easy answer, but I've just worked with 2x16 text displays so far. I could use a Mega, but I think that only 13 I/O digital pins are needed, according to the schematic (Another question: is VOUT a pin that provides the excess of voltage?
Thank you, Juan.