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 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 Material Total 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

Questions?