Lighting and Instrumentation

1
Lighting and Instrumentation

• Dhananjay V. Gadre
• Netaji Subhas Institute of Technology, New Delhi,
  India
• http//www.nsit.ac.in
• http//dvgadre.com

2
Electrical Power Problems

• Rural areas with electrical power shortage
• Pabal Fablab gets 10-12 hours every day
• Typical village in North India 3 hours every
  other day

3
Lighting Solutions

• LED lighting solutions
• 100,000 hours of operation
• High power LEDs (3W) available
• Twice as efficient as traditional lighting
  solutions
• Cost getting low all the time

4
LED Lantern

• Sealed battery- 6V/5AH
• Ability to charge the battery with overcharge
  protection
• Luminosity comparable to 11W CFL
• Parts cost lt 10

5
Derivatives

• Open source hardware and software
• Encourage local people to get into opening small
  businesses to produce the lanterns

6
Instrumentation

• Instrumentation for healthcare, measurement etc.
• Genesis in Dr. Kalbag at Pabal needing a
  mechanism to measure milk quality.
• Neil came up with this possible solution

7
Step Response Measurement System

• Applies Voltage step across probes to be inserted
  in milk
• Tiny Micro measures time response with an on-chip
  ADC with undersampling
• Equivalent to swept frequency measurement system
  to measure gain and phase.

8

• Problem of a unipolar voltage step polarizing the
  milk/liquid has been solved with a bipolar
  mechanism.
• Need substantial measurements to conclude whether
  this is a feasible method

9
Low cost Instrumentation

• Idea of sub-1 computational engine is very
  attractive
• Use 8-pin Micro with 6 I/O pins
• Display usually a go/nogo type
• Large display means migration to a bigger and
  more expensive micro

10
Miserly Display

• Use Charlieplexing
• For N o/p lines, allows N(N-1) LEDs
• Can be arranged in 7-segment format
• Allows 2-1/2, 2-3/4 or even 2-4/5 display with 5
  o/p lines
• Allows 1 line with analog or digital input for
  relevant sensor