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Infrared Sensitive Lights (ISL). Miguel Contreras IME 458 – Advanced Microelectronics and Electronic Packaging Spring 2014. Specifications/Design Overview. General Specifications Through hole components RoHS compliant Physical Dimensions 4 x 8 inches (10.16 x 20.32 cm)

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infrared sensitive lights isl
Infrared Sensitive Lights (ISL)

Miguel Contreras

IME 458 – Advanced Microelectronics and Electronic Packaging

Spring 2014

specifications design overview
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 material
Bill Of Material

Total Cost:

~ $32.00

Total Components:

- 65 through hole

prototype debugging
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

Decoupling Capacitors

Phototransistor

Ultra-bright LED

Infrared LED

ISL Schematic

fabricated pcb
Fabricated PCB

Unpopulated Board

fabricated pcb1
Fabricated PCB

Populated Board

isl modes light sensitivity
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.

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