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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
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 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