Discussion in "Project Help" started by    cenadius    Aug 19, 2007.
Fri Oct 05 2007, 03:12 am
ok :-)
Mon Jul 21 2008, 11:39 am
Hi
I am also doing similar project
Here I want control the proportional valve by varying 0 to 24v(0-400mA) using 8051 PWM
Can you help me regarding the hardware?

Regards
chandu
Mon Jul 21 2008, 04:56 pm
you can make use of L293D for this...
Mon Jul 21 2008, 06:37 pm
For PWM technique, it is very easy and compatible if u go head with PIC Controllers.
If u want more guidence, contact [BLOCKED BY ADMIN]

they are dealing with embedded projects based on 8051,PIC, AVR, ARM,Reneses and DSP processor also..U will get complete guidence on your academic and research projects.


[ Edited Tue Jul 22 2008, 08:51 pm ]
Tue Jul 22 2008, 01:45 pm
Thanks for reply

In the L293D have 4-channel driver, but for my application I need only one channel
It is the proportional valve which control the flow of the gas
The flow of the gas I have to control using micro controller PWM

Please can you send Hardware circuit related to this project?


Regards
chandu
Tue Jul 22 2008, 07:12 pm
hi nattu/chandu/naresh,
in the above project, the fan speed is controlled depending upon the temperature input but the temperature itself is not being controlled. so please confirm if u really want to control only the flow of gas for pr-determined levels of temperature OR whether ur valve is directly controlling the temperature because both the algorithms are completely different. If the former is true, then the above algorithm will hold good but if u require the latter one then better start a new thread with a detailed specification of ur requirements.do also mention whether u require a continuousl changing output(analog) or fixed predetermined output levels.
Sun Aug 31 2008, 06:47 pm
hi there, i am kinda impressed with this project, but i wish to ask, is there any other possible chips that i can use besides AT89S51? can i use maybe any other Atmel products like Atmega 8, Atmega8515 or Atmega 88?
Sun Aug 31 2008, 11:53 pm
sure silver,
u can use any of the above ICs (AVRs) and if u have understood the concept well, u would find it very easy to write the code in AVR.
AVRs are much more faster/powerful than even the fastest 8051 processor available ( provided both run on the same frequency ).
Tue Sep 02 2008, 12:48 am
pdi i have single cycle 8051 the fastest one.. i think it can beat avr
Tue Sep 02 2008, 08:34 am
i see, thanks for the quick reply. but i wish to ask a few more things. what is the closest AVR/8051 chip that can replace this AT89S51 for this project?

besides that, can the assembly code given by Ajay be applied in the other chips?

in the schematics given at page 3 of this project, can i ask is it possible that i replace the diode 1N4002 to 1N4003?

hope that you all can help me in this:P. thanks.

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