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the Web; a quick search for HD44780 will provide an overwhelming amount of it An excellent two-part tutorial can be found at wwwepemagcom/lcd1pdf and wwwepemagcom/lcd2pdf, and a valuable PICAXE-specific LCD resource is available at wwwhippyfreeservecouk/picaxelchtm
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TABLE 9-1 Pin 1 2 3 4
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HD44780 LCD Pin-out Name Vss Vcc Vee RS R/W En DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7 A K Function Ground +V (+3 to +5 volts) Contrast control Register select (H = data / L = cmd) Read/write (H = read / L = write) Enable Data bit 0 Data bit 1 Data bit 2 Data bit 3 Data bit 4 Data bit 5 Data bit 6 Data bit 7 Backlight anode (optional) Backlight cathode (optional)
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Understanding the Basics of HD44780-based LCDs
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Character-based LCDs are commonly available in sizes of 8, 12, 16, 20, 24, 32, or 40 characters by 1, 2, or 4 lines We re going to be using a 16X2 display because that s by far the most readily available and inexpensive variety New displays are available for about $10 (see wwwmousercom) and for considerably less on the surplus market (eg, wwwallelectronicscom or wwwgoldmine-elec com) and eBay Any 16-character by 2-line HD44780-compatible LCD will work for the experiments and project in this chapter, as long as it meets the requirements we are about to discuss All HD44780-based LCDs share a standard pinout, which is presented in Table 9-1 Pins 15 and 16 are optional; their function is to power the display s backlight, if it has one (We ll discuss each of the pins in more detail later) For our purposes in this chapter, the most important consideration is the position of the I/O connector on the LCD board If you jump ahead for a moment and take a look at Figure 9-3, you ll see the solder connections for the LCD s 16-pin connector in a single row near the left end of the top edge of the display This is the configuration that we will need when we construct our projects in this chapter and the next The majority of HD44780-compatible LCDs have their connector in this position, so you shouldn t have any difficulty finding one to use in our experiments If you decide to use a backlit display, and especially if you intend to experiment with more
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than one display, there s an important issue that you need to keep in mind The LCD backlighting is LED-based, so a current-limiting resistor is usually required However, the correct value is rarely stated in the display s datasheet, so you may need to do a simple calculation to determine the correct size for the current-limiting resistor You need to know the typical forward voltage (Vf) across the backlight and the maximum forward current (If) through the backlight For example, the datasheet for one of my LCDs specifies a Vf of 40V and an If of 120mA Since we re using a 5V supply, a Vf of 4V leaves 1V to be dropped across the resistor, and 1V / 120mA 83 , so that s the minimum resistor size we need (Actually, I would probably double that to be safe)
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Interfacing Parallel LCDs
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Unfortunately, you can t always find the datasheet you need, and even if you do, some of them don t include the necessary data (go figure!), so you re left on our own to determine the correct size for the current-limiting resistor The easiest way to do that is to start with a safe value (eg, 330 ) and see if the display seems bright enough If not, lower the value a bit and try it again until the display is reasonably bright Once I have found a value that I like, I write it on the back of the display with a Magic Marker That way I don t have to repeat the process every time I experiment with a different backlit display
The first command in Table 9-2 requires a brief explanation First, the manner in which the LCD is initialized is determined by a command called Function Set Rather than explaining all the options of the Function Set command, I have simply included the correct value (56) for the way we are going to set up the interface: a two-line LCD with 5 7 dot characters and an eight-bit data interface If your display requires something different (eg, if it s a one-line display), see the documentation for the Function Set command in the display s datasheet In addition to being able to move the cursor to the beginning of either line (the last two commands in Table 9-2), you can place it at any specific character location by simply sending the appropriate command The display locations are numbered sequentially from the beginning of each line, so you just need to know the value that s associated with the position at which you want to print the character For example, if you wanted to print a character at the fourth position of line 2, you would simply send a command of 195 (ie, 192 3) Also, when a character is printed to the display, there s no need to specify the location for the next character it s automatically incremented by one unless you specify otherwise As we ll see in our first experiment, this makes it a simple matter to send a string like Hello World! to the LCD
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