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Universal User Interface Module

with LCD and SD card

Universal User Interface Module
This module provides a simple user interface for extending microcontroller-based circuits. Graphics and text display commands can be sent to it over a serial interface, and, using its UART, the module reports back when the state of any of six inputs changes. Additional firmware can display a slideshow of images stored on an SD card.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors
R2 = 10kO, SMD 0805
R3,R4,R5,R6,R7 = 150O, SMD 0805
R8 = 470O, SMD 0805

Capacitors
C1,C3,C4,C5 = 100nF, SMD 0805
C2,C6 = 2µF2, SMD 0805
C7,C8 = 22pF, NP0, SMD 0805

Semiconductors
D1, D2 = MBR0520L, Schottky, SOD-123 (Farnell # 1467521)
IC1 = PQ1T301M2ZP, voltage regulator (LDO), 3V, 400mA, SOT-23-5 (Digikey # 425-1674-1-ND)
IC2 = ATmega168-20AU, TQFP32 (Atmel

Miscellaneous
LCD1 = LM15SGFNZ07 (see text)
X1 = 7.3728MHz quartz crystal, HC-49 case
K1 = 10-way SIL pinheader, lead pitch 2.54 mm
K2 = SD card socket (Farnell # 9186158)
K3 = 6-way (2x3) boxheader, lead pitch 2.54 mm (Farnell # 1096984)
K4 = 6-way SIL pinheader, angled pins, lead pitch 2.54 mm
JP1= 3-way pinheader with jumper, lead pitch 2.54 mm
PC1,PC2,PC3 = solder pin, 1mm diameter
Enamelled copper wire, max. 0.5mm diameter
PCB, ref. 080320-1 from www.thepcbshop.com
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