Jumpers can be placed over the BLA and BLC headers to connect them to +5volts and ground (respectively). To make the adapter compatible with the maximum number of LCDs, it simply brings the backlight pins to headers BLA (anode, +) and BLC (cathode, -). There are lots of different backlights - some need a resistor, some need negative voltages, some just use too much current for the Bus Pirate to supply. The LCD adapter doesn't power the backlight directly. Most character LCDs use the same pinout, but be sure to verify the voltage and pinout before starting. References: example datasheet, HD44780 command reference, HD44780 LCD uber-siteĬonnect the Bus Pirate to the LCD adapter with a 10 pin ribbon cable.Ĭonnect an HD44780 LCD to the 1x16 header on the adapter.Bus: 4bit parallel, with 74HCT595 adapter board.The new surface mount design using a simple shift register is much cheaper and much faster than v1. V1 was never produced because the parts were too expensive. The v2 LCD adapter is a major update from v1. The adapter has an 8 pin output expander, standard LCD connector, and other stuff LCDs usually need like a contrast adjustment resistor. The Bus Pirate only has five free pins, so we made a small adapter board to test LCDs. It takes at least 6 pins to control a common character LCD based on the HD44780 chipset. 9 Development history and production resources.
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