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If you want to test the i2c signals and the internal LCD RAM, you can use the hd44780 library and run the run the included I2CexpDiag diagnostic test.

#include // includes the LiquidCrystal LibraryLiquidCrystal lcd(1, 2, 4, 5, 6, 7); // Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7)void setup() {lcd.begin(16,2); // Initializes the interface to the LCD screen, and specifies the dimensions (width and height) of the display }}void loop() {lcd.print("change me"); // change the text to change the textdelay(3000); // 3 seconds delaylcd.setCursor(2,1); // Sets the location at which subsequent text written to the LCD will be displayedlcd.print("change me");// change the text to change the textdelay(3000);lcd.clear(); // Clears the displaylcd.blink(); //Displays the blinking LCD cursordelay(4000);lcd.setCursor(7,1);delay(3000);lcd.noBlink(); // Turns off the blinking LCD cursorlcd.cursor(); // Displays an underscore (line) at the position to which the next character will be writtendelay(4000);lcd.noCursor(); // Hides the LCD cursorlcd.clear(); // Clears the LCD screen}

As far as I know, if all the connections and power busses are correct, and you"re using series protection resisters between the 5V LCD and the 3.3V Propeller pins, then the on power up all "generic" HD44780 LCD"s will be in factory default 8-bit data mode and must be programmed (initialized) by the driver first to work in 4-bit mode. You do not need all eight (db0-db7) LCD pins connected to initialize to 4-bit mode (db4-db7 connected).

I"m using a 5V (only) 4x20 P/N YB2004A HD44780 compatible LCD with blue background and white characters in 4-bit mode. Many have used this particular LCD module with success.

All the LCD data I/O and control lines are connected to the 3.3V Propeller via 4.7K resistors for protection. All my connections to/from the LCD are less than around 3 inches and connected directly to the prop pins on my tried and true home-brew DIP Propeller dev board.

The first time I connected the brand-new out-of-the box LCD and ran the jm_lcd4_ez driver object it worked fine. Just as expected from what I can see in the driver demo object when properly configured for my 4x20 LCD connected to the Prop-I.

The contrast is set properly on my LCD from the first succesful run of the jm_lcd4_ez object. My LCD likes 0.7V on the contrast pin, which from my experience is correct. At the moment I"m setting the contrast from the wiper of a small Bournes PCB mount 10K multi-turn pot with the pot"s end-leads connected between 5V and GND. 5V is connected to the CW rotation wiper end.

Tip: If you don"t want to use a pot to set the contrast, try putting a signal diode like a 1N914/1N4148 diode with cathode to ground in series with a 4.7K or 10K resistor to 5V, then connect the diode cathode to the LCD"s contrast pin. This should set your contrast pretty-much correct without having to use a pot or a fixed divider. But before doing this you may want to verify your LCD contrast is OK with around 0.7V on the contrast pin with a pot first.

With the backlight on the 5V bus is reading about 4.9V, so the backlight isn"t overloading the 5V power bus. The backlight is drawing around 110mA which is as expected for this 4x20 LCD. My 5V bus is regulated via a venerable 7805 regulator fed with 8V.

Next, with the jm_lcd4_ez driver working, and without making any changes to the driver example code, I reloaded the previously working jm_lcd4_ez object code into the Prop RAM.

Any type of power on/off reset and reload of the object doesn"t work. Now the LCD just sits with the top-most line and third line from the top all pixels on and the other two lines blank. I think this may be the correct initial power on display for the 4x20 LCD. I remember with 16x2 HD44780 LCDs that power on reset with no data coming in results typically in the top line being all pixels on and the second line being blank.

As I remember, these generic HD44780 LCD"s don"t have any hardware reset pin. The LCD"s are reset to factory defaults upon power up with no non-volitile storage on the LCD. You have to properly re-initialize the LCD for data-pins used (4 or 8) etc. in software upon first power-up every time. If this is indeed true in my case, then I shouldn"t be seeing this problem unless there is a hardware interconnect problem.

Next I added a three second delay to both of the objects mentioned above right after power up and before the LCD is initialized. This was just to make sure everything settles down before communication with the LCD starts.

1. For a third time, reconnect and recheck the LCD/Prop interconnections. Maybe make the leads shorter or reduce the 4.7K protection resistors to something like 2.2K (in desperation).

The "4-bit Parallel LCD driver" by Chris Gadd in Obex is very well documented, worth a read IMO. Unfortunately for me I"m trying to use a 4x20 LCD, this object is for 16x2 only. I"m not sure if this matters for a simple test though. I may give it a try:

* Recheck all your LCD connections. Keep them short. Try to separate the pins for the control lines to reduce cross-talk (the four data connections typically all need to be contiguous). I do not recommend trying to drive the LCD via a "plug breadboard". Make a direct connection cable with series resistors "mash-up" cable instead. An old floppy drive connector/cable cut down (short) with soldered series 1/4 or 1/8 Watt resistors can be used for this in a pinch. Apply some hot glue to the resistors to keep them in parallel, at least for the four LCD data pins, if you are separating the I/O control pins.

* Be SURE to use series protection resistors between the 5V LCD and the 3.3V Propeller to prevent damaging the Propeller during power-up and LCD initializatoin or LCD read.

* Recheck how you are setting the LCD pins in the driver object. Check the pins with a logic analyzer if you have one (I use the Open Bench Logic Sniffer).

* Try putting a waitcnt delay of several seconds in your LCD demo object before the LCD initialization occurs to allow things to settle down before the LCD driver starts communicating with the LCD. This example will introduce a wait of 3 seconds:

* Try the LCD without the backlight on. Maybe the backlight is overloading your 5V bus. The backlights take a lot of current. If you do use the backlight, make sure the 5V bus voltage is within tolerance.

and dot matrix displays. More recently the development and introduction of in-plane switching (IPS) wide viewing angle technology has reiterated Hitachi’s commitment to providing display excellence. An annual investment of €130m in research and development will ensure that Hitachi remains at the forefront of evolving and ground breaking LCD technology. Dedicated manufacturing and production facilities in Mobara, Japan and Kaohsiung, Taiwan ensure that continuity of supply can be maintained during extreme market fluctuations. In house design, production and procurement of key components such as LCD glass, colour filters, LCD drivers and backlights, allows

LCD display for replacing a broken one or for creating something new. This LCD display can be used easily with Arduino, Raspberry Pi, Intel Edison or any other embedded system you want to work with.

Due to the ancient LCD controller technology made by Hitachi, the board controller requires 5VDC operating voltage. In order to easily use this display with say Raspberry Pi (3,3VDC) you need to hack this display a bit. In order to make it work with lower operating voltage, add a 8pin voltage converter such as ICL7660 (or similar) onto the space indicated with label U3. Then populate C1 and C2 with 10µF SMD capacitors and remove J1 solder bridge. To finalize the job enable the voltage converter by soldering a solder bridge across the J3 contact pins. You have now an LCD display capable of operating with lover operating voltage.