PIC based LEGO controller 29-aug-2002

• 3 light sensors, buildt into standard 2x2 black LEGO bricks. The light sensors is connected to the analog inputs on the PIC, using 3 wires: Vcc (red), GND (black) and signal (yellow). The sensors used is light sensitive resistors. The reason I choosed them is that I already had some lying around.
• The power supplys voltage can now be measured, using a voltage divider and an analog input on the PIC.
• Two-way serial communication is implemented, using a SIPEX SP 232 ACP serial line driver/reciever. Baud rate up to 115200.
• To save some output pins on the PIC I've added a HEF 4094 BP 8-stage shift-and-store register. 4 pins on the PIC can control 8 output pins on the HEF 4094, and more 4094s can be added in a cascade, not using more pins on the PIC, but that will ofcause add to the time it takes to shift out the values to the output pins.