8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008 Rickey's World contact@nospam.com (Ajay Bhargav) contact@nospam.com (Ajay Bhargav) Wed, 07 Jan 2009 15:47:43 -0800 Wed, 07 Jan 2009 15:47:43 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html I want to make this temperature controlled fan and since i am using 15V AC power supply instead of 230V AC. what i want to know is if i would have to change the triac and the resister shown in the diagram below and also if i can use MOC3041 Triac driver optoisolator (RC) instead of MOC3011 ??
any help will be much appreciated.

]]> Tue, 02 Dec 2008 08:21:38 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html


Arun]]> contact@nospam.com (Ajay Bhargav) Tue, 02 Dec 2008 10:59:28 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html
As a beginner I would recommend you use a relay instead of the BT136
and the MOC3011
Put the output of pin 22 through a 1K resister to drive a transistor,
to operate a relay.
What wattage is your fan ?]]> contact@nospam.com (Ajay Bhargav) Tue, 02 Dec 2008 14:02:41 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html can i use optocoupler ISP815 instead of pc817 or mct2e because i cant find them. and can i also use "DF01 BRIDGE RECTIFIER 1A DIL4 RC" on my circuit?
sorry to ask u soo many questions but i'm soo confuesd
updated diagram: http://www.geocities.com/niu_logic/circuit_diagram2.GIF

PS: the fan is 15V AC and the rest of the information is on the circuit diagram in the link above.]]> contact@nospam.com (Ajay Bhargav) Tue, 02 Dec 2008 14:53:33 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html Hello digital-guy,

First things first - tell me which supply are you actually using for the Fan motor ? AC or DC

Yes, if you use DC supply for fan then you can remove the bridge ( but you first said you had 15V AC ). The LED part of the optocoupler in my diagram should be connected the same way its in your original schematic. and you don't have to connect the pin 6 ( collector), leave it floating.


I think you have to be clear in what you intend to do, you had first said you have a 15V AC supply for fan and now you are saying you have 15VDC supply - if the latter is true then you can simply use a power mosfet to run the DC fan ( BTW you haven't said anything about fan's wattage).



Arun




]]> contact@nospam.com (Ajay Bhargav) Wed, 03 Dec 2008 23:36:29 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html
i have drawn the circuit to make things clear, pl.go thru it :






Arun]]> contact@nospam.com (Ajay Bhargav) Wed, 03 Dec 2008 07:32:49 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html
i was just wondering if the rectifier converts the 15Vac into 15Vdc can i just use a 15V or something dc power supply and remove the rectifier from the circuit?
and also on ur diagram above u have 5pins for the optocoupler. pin5 for +5V dc, pin4 going into resistor and what about the rest, is pin1 going into the port 22 of the microcontroller and where are the rest of the pins going?]]> contact@nospam.com (Ajay Bhargav) Wed, 03 Dec 2008 16:44:41 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html im very sorry if i have not made it clear about my power supply. basically i am still thinking about the power supply and which one to use. looking at my options now...i think i should use a 15V dc power supply as i wont have to use the bridge. this also means i should use a 15V dc fan. So u mean the circuit should look like this below if i am using 15v dc power supply and 15v dc fan.



]]> contact@nospam.com (Ajay Bhargav) Thu, 04 Dec 2008 10:48:43 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html contact@nospam.com (Ajay Bhargav) Thu, 04 Dec 2008 10:43:52 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html
or you can make use of dc motor driver like L293D (see tutorial for more information) its easy to use and controls motor over good range of voltage and current.]]> contact@nospam.com (Ajay Bhargav) Thu, 04 Dec 2008 13:49:56 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html hello digital -Guy,

to make things simple, use the circuit i had given on "Wed Dec 03 2008, 09:06PM" it works for both AC and DC Fans.

use AC supply if you use AC fan, use DC supply if you use DC fan, in both the cases no changes are to be done in the circuit diagram.


hope this clears your confusion.


Arun]]> contact@nospam.com (Ajay Bhargav) Fri, 05 Dec 2008 00:12:55 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html thanks for making it very simple for ppl like me to understand....really appreciated it. but 1 little question just to make sure i got it right..
now that i am using 15vDC power supply would the circuit look like this below
and the triac in the diagram is BT136 which i can find but which one is the optocoupler model.
i also noticed that u said that the led part of the optocoupler should be connected in the same way as it was with the moc3011. but in moc3011 on the left hand side, the upper pin(pin1) is going to 5v dc and the lower pin2 one going to port22 of 8051. pin6 into triac and pin4 into resistor.
but in optocoupler pin4 is connected to the resistor which is connected to triac and pin5 is connected to 5v DC. and im assuming the pin2 is going into port22 of 8051 and pin1 to 5v dc if i am right ?

]]> contact@nospam.com (Ajay Bhargav) Fri, 05 Dec 2008 07:51:38 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html ]]> contact@nospam.com (Ajay Bhargav) Fri, 05 Dec 2008 12:11:23 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html digital guy, you can use any general opto like : PC817, MCT2E, 4N25, ........ etc if you have any other opto on hand then search for its datasheet to know its pin out.

pin out of MOC3011/21/41 etc are different from other optos so don't be rigid on pin numbers.

opto connections: ( for any optocoupler)

LED side : Anode to + 5Vdc, cathode to pin 22 of micro thru series resistor 330ohms.

transistor side : collector to +5dc, emitter to gate of SCR/Triac/transistor/mosfet thru a series resistor of 1 K.

don't forget to connect GND of your 15 Vdc and 5 Vdc supply together ( if there are derived from separate sources)


it cannot be more simpler than this, i hope


Arun]]> contact@nospam.com (Ajay Bhargav) Fri, 05 Dec 2008 18:09:28 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html thanks for making it soo much easier for me to understand
i was just wondering if the assembly code for the circuit will be the same for the circuit with moc3011 and 203V ac power supply at (http://www.8051projects.net/downloads170.html) and it will work in the same way and have the same features.]]> contact@nospam.com (Ajay Bhargav) Sun, 07 Dec 2008 11:01:42 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html i just wanted to ask something about the 7 segment led display that i am using
i am using dual digit 7segment " kingsbright DA56-11SRWA". it has 18 pins 9 on top and 9 on bottom
i just wanted to ask how i should connect it in the same way as the diagram below. there are no pin letters ( a,b,c etc) and there seem to be no dp pin as only 7 lines from microcontroller are used. i am using a breadboard.
your help would be much appreciated
thankyou

]]> contact@nospam.com (Ajay Bhargav) Fri, 19 Dec 2008 04:00:56 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html

in the above schematic the multiplexed seven segment LED display is connected to Port0, about the connections- port0.0 is connected to segment "a", port0.1 to "b"...... so on upto port0.6 which is connected to "g". since the dp is not used port0.7 is left unconnected.

its always better to use pull-up resistors for port0 which are obviously missing in the above circuit.


and here's datasheet of the LED display is you don't have it


836779e2ed.pdf


Arun]]> contact@nospam.com (Ajay Bhargav) Fri, 19 Dec 2008 05:59:59 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html this part of the circuit is attached to port 13 of the 8051. and if i am not mistaken it just converts 230V ac into 5v dc. since i wont need this part as im already using a power supply that can produce 5, 12 and 15 v dc. so do i just connect 5v dc into port 13 of microcontroller??

]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 06:26:47 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html so i dont really need it for everything to function properly...right?
and the other thing is that the 7 seg dual display has 18 pins, like shown below.
can i connect all the a,b,c,d....g's togather for both dual 7 segments except the connections going to the transistor. and are the connections going to the transistors are as shown below??? or is it a different pin of 7 seg?? in other words are the first 8 pins are as follows; a b c d e f g dp and transistor pin and the same for the 9 pins below for the same dual 7 seg led display.(common anode). and the pins that do go to the transistor, do they go into the emitter of the transistor?

]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 06:58:06 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html Hello Digital Guy,

if i am not mistaken it just converts 230V ac into 5v dc. since i wont need this part as im already using a power supply that can produce 5, 12 and 15 v dc. so do i just connect 5v dc into port 13 of microcontroller??



No, its not just mere Power supply but its also a ZERO CROSS Detector circuitry built around dual OP-AMP which sends square wave pulse to micro at pin 13, so that the micro knows when it can "fire" the Triac.



Arun]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 06:37:56 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html hope you're following the correct pinout.

Pins 14 and 13 are the common anode pins of the 2 displays and connect to the emitters of the transistors as shown in your schematic.

And yes you may connect the respective a,b,c.. segments of both displays.

]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 08:39:29 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html does this mean that the connections would look like this.?
sorry about this....i just like to visualise everything before making it final
]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 11:32:11 -0800 http://www.8051projects.net/forum-t15092.html Re: Help with temp. control fan hardware http://www.8051projects.net/forum-t15092.html Why don't you take a multimeter,connect one probe to the common anode pin and the other to the cathodes,one by one, and check for yourself.

Your approach is good ... better to clear things up beforehand,rather than learn it the hard way. ]]> contact@nospam.com (Ajay Bhargav) Mon, 29 Dec 2008 19:37:27 -0800 http://www.8051projects.net/forum-t15092.html