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temperature sensor using 8051 microcontroller to pc visual basic

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mic_k86

Sun Jun 08 2008, 11:02PM

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so means that if only 1 DS18S20 is used, then no need add on pullup, rite? direct connect the DQ pin to the i/o pin the circuit will work already, rite?

mic_k86

Thu Jun 12 2008, 05:05PM

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is my connection for multiple DS18S20 is correct? i have attach a circuit diagram at below. pls check it out.

Ajay

Fri Jun 13 2008, 12:48AM

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yes they are right.. no need of that jumper, its understandable that wires are passing over each other but not connected

but if you still want to keep it you can

Which software are you using?

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mic_k86

Mon Jun 23 2008, 12:36AM

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i'm using express SCH inside express PCB software. But i can't convert the schematic diagram drawing to PCB. anyone can help me on this? bside, as you can see in the above diagram, the microcontroller pin doesn't arrange from 1 to 40. can the pin arrangement be changed?

Ajay

Mon Jun 23 2008, 08:37AM

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you dont have to worry about the arrangement, when you design PCB, the footprints are always in arranged order. All you need to do is select the right footprint for your part, like for 8051 DIP package 40 pins and 300mils width (check datasheet for more info).

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mic_k86

mic_k86

Mon Jun 23 2008, 10:38PM

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oh i see. is that at expressPCB i need to draw again the circuit? is that this software doesn't hv any function like automatic convert the schematic diagram to PCB diagram?

mic_k86

Tue Jun 24 2008, 06:10AM

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following is my project full circuit diagram. now i having problem on the microcontroller 8051 assembly language. how to wrote the coding so that the temperature sensor can continuous reading the temperature value and continuous display at the PC using visual basic? anyone can help me on this matter? thanks

[ Edited Tue Jun 24 2008, 06:16AM ]