Open source, shematics and BOM and Code at: www.xtune.se The robot has:
4 reflex sensors to follow lines. 1 socket for xbee radio module 2 H-bridges for motor control. 1 Buzzer. 1 HD44780 LCD socket. (LED backlight via N-ch MOSFET.) 1 FTDI FT232R (USB to Serial Port). 1 LM2623 (step-up DC-DC) 1 MAX1555 (a single-cell lithium-ion charger) 1 MCP3208 (8-Channel 12-Bit A / D Converters) 1 LED for power. 1 LED debug. 1 LED charging indicator 2 RC hobby servo contacts.