Miguel Contreras

IME 458 – Advanced Microelectronics and Electronic Packaging

Spring 2014

Infrared Sensitive Lights (ISL)

Specifications/Design Overview General Specifications

Through hole components

RoHS compliant

Physical Dimensions

4 x 8 inches (10.16 x 20.32 cm)

Thickness: 1/16” (1.6mm)

Mounting holes: 0.25” x 0.25” each corner

LEDs & Sensors

8 LEDs Ultra-bright, 10mm OD Wide viewing angle

LED color: Blue

8 Near-infrared proximity detector Phototransistor + IR LED

Sensor range: 10cm, in dark room

Microcontroller and Interfaces

ATmega 164, pre-programmed for stand alone mode

MCU socket: 40-pin socket

Programming interface: Standard 6-pin AVR ISP (SPI)

User input: Single tactile button switch

Clock source: 8MHz internal RC

Power Requirements

Input voltage: 5V DC, regulated

Current requirements: 200mA per panel

Idle current 50mA

Current rating of power switch: 4A

Input power source 2.5 x 5.5 mm jack

Bill Of MaterialTotal Cost:~ $32.00

Total Components:- 65 through hole

Prototype/Debugging Prototype Implementation

One LED sequence = proof of concept for all 8

Prototype First attempt failed

Issues found: Placement of LEDs Distance between sensors

Key takeaways: Phototransistor and IR LED placement

in layout Added decoupling capacitors

ISL Schematic

Phototransistor

Infrared LED

Ultra-bright LED

Decoupling Capacitors

PCB Layout

Fabricated PCB

Unpopulated Board

Fabricated PCB

Populated Board

ISL Modes + Light Sensitivity Eight standard response functions

0. Gentle fade

1. Slow fade

2. Quick fade

3. Ripple

4. Sparkle

5.“Heating” with fade

6. Shadow mode

7.Trigger and very slow fade

(Program 0 is indicated by LED D0, and so on.)

Four built in levels of sensitivity

Hold the button for about ten seconds until it enters a different mode.

Video

https://www.youtube.com/watch?v=gt-_jXnjraQ

Questions?