Serial Communication between PIC16F84A's

So what you're saying is that you toggle a signal in onr device that allows a counter in the other device to count to the value of the data you want to send? That's a clever idea if I'm reading you right.

exactly, this asynchron transmission would work well for simple automation and control systems.

now i think of making a clock shared synchron transmission for models which has no support for serial communication. I think i will give the same clock signal from one source to both one's inputs, a sycnhronization algorithm will b based on this clock signal, this one would work well for continous data transmission with a decent bandwidth,

note that timings should be optimized and fixed, and error tolerations should be too as the crystals these pics use are affected and can give different clock signals. I havent used compensated crystals for microcontrollers yet and have no experience of it. But i suppose, they would give the best performance for timings of every microcontroller.

Actually this sistem is similar to the dialing system of old phones. U know, u put ur finger in ring and rotate. I don't know if this Dial Pulse system is still used, i mean recognised by phone centrals in all countries. That system works in miliseconds. In this one, you can use microseconds. Easy and simple with microcontroller technology and basic programming language.

You can emulate a UART in software and send and receive serial data over any standard I/O pin. Sometimes this is called "bit banging". It takes about 40 bytes of code or so to do both a send and receive function. I have used these on all variety of PIC's down to the 8 pin models and used baud rates up to 9600 with a 4 mHz ceramic resonator. You have to be pretty close to standard frequency to ensure compliance with other UART's since the format is asynchronous but there is adequate margin for variance so it doesn't have to be perfect. If you do the code right all you have to do is change a constant to use different clock frequencies. I think there may also be example code on the Microchip website for doing this. The advantage of this is you can also set up a command structure to send ascii codes and strings so it is very versatile.

it's me, saidakkas, i have hurry and dnt have time for logging on,

I didnt know it, it sounds really cool. I'm a student, studying telecom, so i worked on this as base of my future project, i mean programming a communication. Could you give me some more information about this serial communication you told about?

Microchip application note AN593 is available on line.

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1999&ty=&dty=§ion=&NextRow=&ssUserText=an593

ty,

You can also get all the serial communication you need using a single line if you Manchester encode your data - basically just XOR the data with the clock. On the receive end, you use a transition (high to low or low to high, depending on your implementation) to trigger a timer set to 3/4 of your bit period, and sample the data at that point.

sounds that there are a lot of different ways of serial communication, and more can b found,

using a gate with clock would never come to my mind,

It's common in fiber optic communication and military systems.

Hi!, I'm new in all of this, PIC programming, I'm studing and I'm doing a projet with PIC and communication between them, I'm driving crazy because I can't find any docummentation to do this, so you did and I'd like to know a bit of it, have you the schematic of PIC16F84 connection's? what did you transmit between PICs? in my projet I have to transmit data to move two ServoMotors, I have all doc. to move the servos but I do not know how to transmit between PICs, please help me about it, when I finish the projet I'd like to share my projet with you and everybody. Help me please, Thanks, Victor

By the way your link to youtube is not working, and I'd like to see it. Thanks, Victor

I deleted the video on youtube sometime ago. http://rapidshare.com/files/122093468/yeni_seri_protokol.zip.html Here are the files you need. I suggest you use these only to understand the basics of this communication, so have a look at picbasic pro files. ASM files possible too, but if you were at a level to understand assembler language n knew how to use it, you wouldn't need asking help. Anyway, what i'll say about using assembler is, don't use it yet, you have to recompile transmitter or receiever.pbp, I don't remember which one, I accidently compiled one of them for something else than PIC16F84. By the way, first re-read carefully what I wrote while starting this topic, then try to understand what s written in pbp file, this way would be easier for you to learn.

Hi, I will try to understand the codes, it's look like you connected an LCD to the PIC, have you the connections, schematic of your the circuit? have you the electronics parts list? I'd like to try the same circuit. Thanks. Sorry if I bother you.

There's scheme of it amongst the files I uploade. It can be opened in Proteus ISIS, it was prepared in version 6 of it, Proteus 6... Now what you need is Proteus 6 demo I guess. Proteus is not installed on my computer now, or else I'd give you screenshot of scheme.

hi im a student and im making a project which is a serial communication of two pic16f84a , i need to transmit a binary codes from one pic to othe pic.. example: im using the RB0 pin of pic as output for the 1st pic then i want to transmit a binary code which is 1010001 to the 2nd pic and then if the 2nd pic recieves that binary it will compare the binary wich is installed to it , then if they are the same, the servo motor wich is connected to the 2nd pic will rotate, and then if the binary codes are not the same nothings will happen,, my question is , how can i do the program of that using picbasic pro? pls help me to my project,, here is my email add.. lemzkeey_18@yahoo.com.ph