HD44780 LCD - Revision history

Leo at 20:13, 9 August 2020

2020-08-09T20:13:34Z

← Older revision		Revision as of 20:13, 9 August 2020
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	The LCD can be driven in 4-bit operation mode which only requires pins D4-D7. If you do not want to deal with all this but instead would rather use an i2c interface, you can get an adapter board with a PCF8574 for about $1 USD.		The LCD can be driven in 4-bit operation mode which only requires pins D4-D7. If you do not want to deal with all this but instead would rather use an i2c interface, you can get an adapter board with a PCF8574 for about $1 USD.

	====Pinouts====		===Pinouts===
	The HD44780 has a 16 pin header.		The HD44780 has a 16 pin header.
	{\| class="wikitable"		{\| class="wikitable"
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	\|}		\|}

	====User Defined Fonts====		===User Defined Fonts===
	The HD44780 has a ROM that contains all the ASCII characters for the 5x8 dot matrix. A limited number of custom characters can be programmed into the device as bitmaps and are stored in the controller's memory. These custom characters will need to be re-programmed after the controller is switched on.		The HD44780 has a ROM that contains all the ASCII characters for the 5x8 dot matrix. A limited number of custom characters can be programmed into the device as bitmaps and are stored in the controller's memory. These custom characters will need to be re-programmed after the controller is switched on.

	More information at: http://www.quinapalus.com/hd44780udg.html		More information at: http://www.quinapalus.com/hd44780udg.html

	===Troubleshooting===		==Troubleshooting==

	====Garbage being rendered on startup====		===Garbage being rendered on startup===
	I tried hooking up a HD44780 to an Arduino Pro Mini and tried using the example Hello World sketch but ended up getting garbage being drawn. Adding capacitors didn't help. The odd thing was, the LCD was able to render 'ello, world!' without the first 'H' sometimes but ends up showing garbage again when the microcontroller is reset. <gallery widths="240" heights="240">		I tried hooking up a HD44780 to an Arduino Pro Mini and tried using the example Hello World sketch but ended up getting garbage being drawn. Adding capacitors didn't help. The odd thing was, the LCD was able to render 'ello, world!' without the first 'H' sometimes but ends up showing garbage again when the microcontroller is reset. <gallery widths="240" heights="240">
	File:HD44780 Rendering Garbage.jpg\|HD44780 Rendering Garbage		File:HD44780 Rendering Garbage.jpg\|HD44780 Rendering Garbage

Leo: /* Troubleshooting */

2020-08-09T20:12:56Z

Troubleshooting

← Older revision		Revision as of 20:12, 9 August 2020
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	The Hitachi HD44780 is a LCD controller developed by Hitachi in the 1980s. These displays are easily identified by their 16 pin interface. LCD displays using the HD44780 are inexpensive and comes in various sizes.		The Hitachi HD44780 is a LCD controller developed by Hitachi in the 1980s. These displays are easily identified by their 16 pin interface. LCD displays using the HD44780 are inexpensive and comes in various sizes.

	~~== Usage ==~~		As of 2020, the 20x4 variants cost about $12 CAD while the smaller 16x02 variants cost about $3 CAD.
	~~The LCD can be driven in 4-bit operation mode which only requires pins D4-D7~~.

	==== Pinouts ====		==Usage==
			The LCD can be driven in 4-bit operation mode which only requires pins D4-D7. If you do not want to deal with all this but instead would rather use an i2c interface, you can get an adapter board with a PCF8574 for about $1 USD.

			====Pinouts====
	The HD44780 has a 16 pin header.		The HD44780 has a 16 pin header.
	{\| class="wikitable"		{\| class="wikitable"
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	\|-		\|-
	\|12		\|12
	\|Data 5		\|Data 5
	\|-		\|-
	\|13		\|13
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	More information at: http://www.quinapalus.com/hd44780udg.html		More information at: http://www.quinapalus.com/hd44780udg.html

	=== Troubleshooting ===		===Troubleshooting===

	==== Garbage being rendered on startup ====		====Garbage being rendered on startup====
	I tried hooking up a HD44780 to an Arduino Pro Mini and tried using the example Hello World sketch but ended up getting garbage being drawn. Adding capacitors didn't help. The odd thing was, the LCD was able to render 'ello, world!' without the first 'H' sometimes but ends up showing garbage again when the microcontroller is reset. <gallery widths="240" heights="240">		I tried hooking up a HD44780 to an Arduino Pro Mini and tried using the example Hello World sketch but ended up getting garbage being drawn. Adding capacitors didn't help. The odd thing was, the LCD was able to render 'ello, world!' without the first 'H' sometimes but ends up showing garbage again when the microcontroller is reset. <gallery widths="240" heights="240">
	File:HD44780 Rendering Garbage.jpg\|HD44780 Rendering Garbage		File:HD44780 Rendering Garbage.jpg\|HD44780 Rendering Garbage

Leo at 19:59, 9 August 2020

2020-08-09T19:59:44Z

@@ Line 1: / Line 1: @@
-The HD44780 is a controller for character-based liquid crystal displays.
+The Hitachi HD44780 is a LCD controller developed by Hitachi in the 1980s. These displays are easily identified by their 16 pin interface. LCD displays using the HD44780 are inexpensive and comes in various sizes.
-== User Defined Fonts ==
+== Usage ==
-* http://www.quinapalus.com/hd44780udg.html
+The LCD can be driven in 4-bit operation mode which only requires pins D4-D7.
-{{Navbox Tinkering}}[[Category:Tinkering]]
+==== Pinouts ====

Leo: Text replacement - "Category:Tinkering" to "{{Navbox Tinkering}}Category:Tinkering"

2020-06-15T00:45:19Z

Text replacement - "Category:Tinkering" to "{{Navbox Tinkering}}Category:Tinkering"

← Older revision		Revision as of 00:45, 15 June 2020
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	* http://www.quinapalus.com/hd44780udg.html		* http://www.quinapalus.com/hd44780udg.html

	[[Category:Tinkering]]		{{Navbox Tinkering}}[[Category:Tinkering]]

Leo: recategorize

2019-09-01T03:02:14Z

recategorize

← Older revision		Revision as of 03:02, 1 September 2019
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	== User Defined Fonts ==		== User Defined Fonts ==
	* http://www.quinapalus.com/hd44780udg.html		* http://www.quinapalus.com/hd44780udg.html

			[[Category:Tinkering]]

Leo: Created page with "The HD44780 is a controller for character-based liquid crystal displays. == User Defined Fonts == * http://www.quinapalus.com/hd44780udg.html"

2016-12-18T06:58:38Z

Created page with "The HD44780 is a controller for character-based liquid crystal displays. == User Defined Fonts == * http://www.quinapalus.com/hd44780udg.html"

New page

The HD44780 is a controller for character-based liquid crystal displays.

== User Defined Fonts ==
* http://www.quinapalus.com/hd44780udg.html