Lloyd Boonsboro, Maryland email: dale@fred.net APPLICATION OPERAT
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Sensor Interface "Micro-Pac" Sensor Unit
Lloyd Boonsboro, Maryland email: dale@fred.net
APPLICATION OPERATION
This application note describes method allow PIC12C672 monitor report 2x16 display following environmental conditions: Relative Humidity 0-100%. Barometric Pressure 0-15 PSIA. Ambient Temperature -67oF +257oF. Light Sensor that highly programmable.
Care taken choose transducers that required minimum support components also parts that directly handle temperature voltage compensation that would normally require additional components programming correct.
Microchip Technology Incorporated, been granted nonexclusive, worldwide license reproduce, publish distribute submitted materials, either original edited form. author affirmed that this work original, unpublished work that he/she owns rights such work. property rights, such patents, copyrights trademarks remain with author.
1997 Microchip Technology Inc.
DS40160A/3_016-page
Sensor Interface
Block Diagram:
Display
Temperature
Pressure
Light Level
Humidity
Flow Chart:
Initialize System Variables
Read Temperature Chip
Read Humidity Frequency
Read Pressure Voltage
Read Light Frequency
Display Stored Values 2x16
DS40160A/3_016-page
1997 Microchip Technology Inc.
Sensor Interface
Graphical Hardware Representation:
NJM78L05A VREF Signal 4.9V 50µF Motorola Barometric Pressure MPX54100A Serial Module Scott Edwards Electronics
PIC12C672
TLC555 250K Freq. 100K sensitivity General Eastern G-CAP Relative Humidity 100% 10µF Texas Instruments programmable lightto-frequency converter TSL230 0.1µF Freq. 100% DS1820 wire digital thermometer -67oF 257oF 0.9oF increments
(divide
1997 Microchip Technology Inc.
DS40160A/3_016-page
Sensor Interface
NOTES:
DS40160A/3_016-page
1997 Microchip Technology Inc.
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