Shared Projects by serisman

KS0108 128x64 Graphic LCD - 2-wire shift register backpack - v1.0

$1.50 each ($4.50 for 3)

NOTE: Working design, but AVR-GCC / Arduino library have not yet been published.

Component: [Sizes] Values (description)

• U1,U2: [SOIC-16N] 74HC595 (the shift registers)
• VR1: [3296W, 3362P (or similar)] 10k (for contrast control)
• C1,C2: [0805] 0.1uF (decoupling capacitors)
• C3: [1206] 1uF (for reset delay)
• C4: [0805] 1nF (for LCD enable line delay)
• D1: [SOD80 (~1206)] LL4148 (for shift register latch)
• R1,R2,R3: [0805] 1k (for shift register latch and LCD enable line delay)

https://bitbucket.org/serisman/pcb-ks0108-128x64-glcd-backpack

$0.20 each ($0.60 for 3)

Pick a side (sourcing or sinking), and install the 3 leds (SMD 0805) on the top side with the indicated orientation.

Install current limiting resistors (SMD 0805) and pin headers on the bottom side.

Note, the VCC / GND pins are already tied together.

$0.12 each ($0.35 for 3)

Designed to match up with the GND, XTAL1, and XTAL2 pins of the Atmel ATmega series.

Install the appropriate load capacitors (~22pF - SMD 0805) on the bottom side.

$0.2833 each ($0.85 for 3)

This module allows the use of common 5v LCDs with systems that have less than 5v (i.e. battery operated systems). It can be mounted directly on top of the first three pins (1,2,3) of the LCD.

Populate U1 with a LM334M and VR1 with a 1k potentiometer.

For a >4v system, connect solder jumper J1. You can leave the back unpopulated.

For a >2v system, connect solder jumper J2 (and leave solder jumper J1 empty). Populate U2 with a MAX660 (or ICL7660 compatible) IC and C1/C2 with 10uF capacitors.

The LM334 sinks a constant current (adjustable with VR1) from the LCD’s VO pin (and hence provides constant contrast) regardless of VCC voltage (as long as VCC - GND > 4v, for >4v system config, or VCC > 2v for the >2v system config).

It is safe to use the >2v system config for a >4v system (i.e. a 5v system), but there will be more wasted current in the LM334.

https://bitbucket.org/serisman/pcb-hd44780-lcd-contrast-backpack

$0.30 each ($0.90 for 3)

https://bitbucket.org/serisman/pcb-cp2102-arduino-pro-mini-adapter

CP2102 USB to TTL

NOTE: If you want to use the auto-reset capabilities, you will need to cut the trace going to the RST pin and connect it to the DTR header pin (red dots/line in the picture below)

Arduino Pro Mini