USB Based Temperature Control

USB Based Temperature Control - USB Based Temperature USB...

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Unformatted text preview: USB Based Temperature USB Based Temperature Control ELET 4720 University of North Texas Mark Zimmerer David Enwere Overview Overview Temperature control using a USB board interfaced to a computer. ► USB Board ► Computer Interface ► Temperature Sensor and Signal Conditioning ► Bulb Control USB Board USB Board ► Velleman P8055 ­USB Interface ­PIC Microcontroller based ­8 bit Analog to Digital Converter ­Digital Outputs USB Board USB Board Computer Interface Computer Interface ► Made in Visual Basic ► Connects/Disconnects with Velleman USB Board ► Set Desired Temperature ► Displays Current Temperature ► Displays Bulb On Computer Interface Computer Interface Sensor Signal Conditioning Sensor Signal Conditioning ► LM34 output 10mv/F Analog Input Reading From Velleman ► LM741 Amplify by 10 200 150 100 50 Input Voltage 9. 3 7 2. 5 2. 2 1. 9 1. 6 1. 3 1 0. 7 0. 4 0 0. 1 27.5 and multiplied by 10 ► Calibrating ADC > 250 Output Integer ► Software divide by 300 Bulb Control Bulb Control ► Invert output with 74LS04 ► Turn on Relay ► Relay turns on Bulb Circuit Circuit LM34 Temperature Sensor V2 R2 1K R1 0 X1 V1 0 1K Analog to Digital Converter A1 L1 Digital Outputs Bulb Relay S1 R3 Block Diagram Block Diagram ► Computer Interface Controls set Temperature ► Feedback is temperature ► Feedback temperature is converted to Voltage Conclusion Conclusion ► USB Board ► Computer Interface ► Temperature Sensor and Signal Conditioning ► Bulb Control ► Block Diagram Questions Questions ...
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This note was uploaded on 10/24/2011 for the course ELET 3700 taught by Professor Grubb during the Spring '11 term at North Texas.

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