Component research

Nick Klein

Ultrasonic Parallax sensor– A single I/O pin is used to trigger an ultrasonic

burst (well above human hearing) and then "listen" for the echo return pulse. The sensor measures the time required for the echo return, and returns this value to the microcontroller as a variable-width pulse via the same I/O pin.

– http://www.parallax.com/product/28015

ATtiny85• Low-power Atmel 8-bit AVR RISC-based microcontroller • 6 general purpose I/O lines, 32 general purpose working registers, • One 8-bit timer/counter with compare modes,• One 8-bit high speed timer/counter, USI, internal and external

Interrupts, • 10-bit A/D converter, • programmable watchdog timer with internal oscillator, • Three software selectable power saving modes, and • debugWIRE for on-chip debugging. • Operates between 1.8-5.5 volts. • http://www.atmel.com/devices/attiny85.aspx

Tactile Buttons

• Single Pull single throw.• Readily available at Radio Shack• Surface mountable• http://www.adafruit.com/products/

367#Distributors

LED Bar graph (Red)

• Forward voltage of 2.2v• Not a SMD (Might be a problem)• Will need a multiplexer to use Due to GPIO pin

limitations.• https://www.sparkfun.com/products/9935

• Do not recommend this product

Battery

• MCU can operate at 1.8v• Ultrasonic sensor needs 5v• 10 Segment LED Bar Graph – Blue needs 3.6v• 10 Segment LED Bar Graph – Red needs 2.2v• We need a battery that can provide at least 5v.• Rechargeable is a “Nice to have”

• Power source can be USB??