User Guides and Spec Sheets

Lab Instruments:

Function Generator
Digital Multimeter
Oscilloscope
Power Supply

Arduino-Related:

Arduino Uno Schematic
ATMEGA 328P

Transistors:

2N3904
2N2222A
TIP31

IR Sensors:

Sharp GP2D05 Digital Sensor
Sharp GP2D12 Analog Sensor
Sharp GP2Y0A02YK Analog Sensor
Optical Interrupter

H-Bridge:

L298

Mechatronic Design Software

KiCad

http://kicad-pcb.org

Fritzing

http://fritzing.org

Eagle

http://www.cadsoftusa.com/downloads/

DipTrace

http://www.diptrace.com