Need help in circuit...

[masti07]

Sir,
I'm trying to make a project using 8051 in which I'll send data from one micro-controller to another - wirelessly.

In this I'll be using a micro-controller as server which will send or receive data. Second micro-controller will be the client which will work on the basis of instruction received and then send acknowledgment for the same.
I would be using this transreceiver
http://www.sunrom.com/index.php?main...roducts_id=498
(as this one will be easily available to me)
I tried reading the datasheets and I came up with this circuit diagram.....please check it and tell me if its correct

[Binu]

Yes the circuit is correct, the ST1197 is the microcontroller which connect the transceiver with the 8051 micro.

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[masti07]

Firstly, Thank You for Your prompt reply.

I also have another querry. Since ST1197 needs 3V to operate and I am operating 8051 at 5V, would i have to construct two different Power supplies or is there any method by which i can, say attach IC7805 and IC7803 together in a single Power supply circuit and obtain two distinct voltage lines?

[Binu]

Yes you need 2 different power supplies, there is no 7803.
Use LM317 or some other 3.3v power supply.

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[masti07]

i am facing two more problems-

1.) The wire that i am using from the power supply to my microcontroller is more than 1 mt. in length, thereby resulting in a lot of current loss, is there any way by which i can regain the current? (other than shortening the wire)

2.) For example, the stepper motor that i use has a step angle of 10 degrees, and i want have a net rotation of total 360 degrees, this means i should send ten instructions by changing the bit pattern. The problem is, timing of these instructions; should i send them at a single go (using a while loop) to the IC or should i wait before for the 1 rotation to complete before sending the next instruction.


Thank You for Your time

[Binu]

1.How much voltage do you get at the microcontroller supply pins? The microcontroller can work even on 4.5v. Check the datasheet for the minimum voltage for the microcontroller operation.
2. you have to wait, put a small delay inbetween the outputs.

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