29121, 规格书,Datasheet 资料.pdf

Copyright ? Parallax, Inc. LCD Terminal AppMod (#29121) v1.2 8/1/2008 Page 1 of 9 599 Menlo Drive, Suite 100 Rocklin, California 95765, USA Office: (916) 624-8333 Fax: (916) 624-8003 General: info@ Technical: support@ Web Site: Educational: LCD Terminal AppMod (#29121) 2 Line x 8 Character LCD Module with User Buttons Introduction The LCD Terminal AppMod provides a simple and convenient method of adding a standard character LCD and 4 user-input buttons to BASIC Stamp projects. Its 20-pin male header plugs into the 2x10 AppMod Header socket on the Parallax Board of Education (#28150, #28850) or Super Carrier Board (#27130). Features ? 2 x 8 LCD module, HD44780-compatible ? Parallel LCD uses 7 I/O pins ? Contrast control pot ? 4 buttons for user input ? +5 VDC, supplied through AppMod Vdd Appmod Header Pinout (Board of Education and Super Carrier Board) LCD Terminal AppMod Pinout 芯天下--/ Copyright ? Parallax, Inc. LCD Terminal AppMod (#29121) v1.2 8/1/2008 Page 2 of 9 Board Installation The LCD Terminal AppMod’s 20-pin male header plugs directly into the 2x10 socket. Before installation, be sure to check the board silkscreen labels for proper orientation. The photos below show the proper orientation on a Super Carrier Board (left) and a Board of Education (right). Use caution: reversing the connection could result in applying power to the LCD’s ground pins and could damage your unit. Schematic D7 D6 D5 D4 RS R/W Vss P7 P6 P5 P4 P1 2 x 8 LCD 10 k? 14 13 12 11 4 5 1 2 3 6 dd Vo 1 k? P2 P3 10 k? Vdd Vdd E 芯天下--/ Copyright ? Parallax, Inc. LCD Terminal AppMod (#29121) v1.2 8/1/2008 Page 3 of 9 Circuit Notes The resistor values are important for the proper operation of the circuit. You may be wondering if the LCD will be adversely affected if a button is pressed while the BASIC Stamp is writing to it. The answer is no. When no buttons are pressed, the signals from the BASIC Stamp m