Basic Stamp Lightmeter Presentation

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Information about Basic Stamp Lightmeter Presentation
How-to & DIY

Published on August 19, 2009

Author: tomkinsc

Source: slideshare.net

Description

This is a presentation on a project I completed as a freshman as part of the "Computers, Instuments, and Data Acquisition Techniques" course taught by Dr. Bob Kremens of RIT.

STAMP-based Lightmeter Christopher Tomkins-Tinch ThroughTheKeyboard.com

The Sensor

TSL230 Light to Frequency Converter

How is the TSL230 Used? • The TSL230 outputs a square-wave pulse train with a frequency proportional to light intensity • These pulses can be counted to determine the frequency output by the TSL230 in a given amount of time. From this, the relative intensity can be determined.

TSL230 Functional Diagram

TSL230 Output Frequency

The Microcontroller

Basic STAMP BS2e Programmable BASIC-running microcontroller

How is the STAMP BS2e used? • The STAMP • The STAMP regulates interfaces with and power for the TSL230 reads in output from -- 9V source to 5V the sensor, and sets supply the sensitivity multiplier • The STAMP handles user input via buttons • The STAMP outputs the data to the LCD • The STAMP handles processing of radiometric data and light intensity calibration

BASIC STAMP BS2e Overview • 64 Bytes RAM (not much!) • Temporary space to store program variables at runtime • 16KB EEPROM • Non-volatile space to store program, constants, long-term data • 16 Channels I/O • Programmable over RS232 (serial)

STAMP BS2e Schematic

The Display

LCD AppMod 2x8 Character LCD Module with 4 input buttons

LCD AppMod Schematic

The Schematic

Lightmeter Schematic

The Program

Rough Overview of Lightmeter BASIC program • Initialize LCD • Set sensitivity multiplier of TSL230 sensor to 1x scaling • Count pulses on input pin for 1 second • Convert count value to ASCII string • Output ASCII string to LCD screen

Rough Overview of Lightmeter BASIC program • 80% RAM usage (approx) • 25% EEPROM usage (approx) • 400 Lines in length (approx)

Build Materials

Build Materials • 6cm x 6.8cm Main Circuit Board • 4.4cm x 1.8cm Sensor Circuit Board • 30 awg solid wire • 24 pin DIP socket • 8 pin DIP socket • 3 pin Molex header -- for onboard programming over serial

The Case

Serpac Enclosure 3.65” x 7.20” x 1.26”

Serpac Case Dimensions

Modifications to Serpac Case • 4cm x 2.4cm cutout for LCD • 1cm x 1cm cutout for 8-pin DIP socket to hold sensor

Results

Results • Current reading is approximately given in units of μW/cm2 • The lightmeter can distinguish light sources of varying brightness quite well • The LCD screen correctly outputs the COUNT value

Possible Improvements • User input via buttons • On/off switch -- quite the oversight! • Calibrate sensor output to known light source • Output useful data -- radiometric, photographic, etc. • Futher case modifications -- button holes, etc. • More secure mounting of internal components

Approximate Production Cost • BASIC STAMP BS2e - $50 • LCD AppMod - $15 • TSL230 - $5 • Serpac Enclosure - $11 • Wire, buttons, connectors, misc. materials - $9 • Total - about $90

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Special Thanks to Dr. Robert Kremens of the RIT CIS Laboratory for Image Algorithms and Systems For his advice, guidance, and supplies

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