The Scribbler S3 is the third incarnation of the Parallax Scribbler open source mobile robot for education. The S3 has many improvements and now features Google Blockly programming support for Apple Mac and Microsoft Windows.

Propeller P8X32A 8-core microcontroller
3 x phototransistor light sensors
2 x short-range Infrared obstacle-avoidance sensors
2 x infrared line-following sensors
2 x independent DC wheel motors with rotation encoders to provide odometry
Motor current monitor for stall sensing
Drive wheel/tail wheel rotation comparator for skid sensing
Pen port for drawing on paper
Loudspeaker for audio output
Microphone for detecting audio tones from other S3 robots
3 x Bi-colour LEDs for visual feedback
Power and Reset pushbuttons
Exposed Hacker port for connecting external sensors, servos, etc
Internal XBee socket for RF networking and future wireless programming
BlocklyProp programming environment, based on Google's Blockly and MIT's Scratch
Power supply: 3.7V 4000mAh Li-Po battery charged from USB port
Communication: USB serial programming interface to PC
Dimensions: 188 x 158.8 x 81mm
Operating temperature range: +10 to +40°C

Download learning materials from: http://learn.parallax.com/tutorials/robot/scribbler-robot/scribbler-3

USB cable

The Propeller™ 1 microprocessor chip makes it easy to rapidly develop embedded applications. Its eight 32-bit processors (COGs) can operate simultaneously, either independently or cooperatively, sharing common resources through a central hub. The developer has full control over how and when each cog is employed; there is no compiler-driven or operating system-driven splitting of tasks among multiple cogs. A shared system clock keeps each cog on the same time reference, allowing for true deterministic timing and synchronization. Two programming languages are available: the easy-to-learn high-level Spin, and Propeller Assembly which can execute at up to 160 MIPS (20 MIPS per COG).