Search found 19 matches

Thank you for your advice, the confusion is cleared up!
regards
piire!

the sp490 and max490 dont have DE and RE pins

the data sheet is below, the enable pins is used to determine if you can send or receive. or is the enable used to tell the complier that a rs485 ic is ...

hi there,
I was wondering if full duplex rs-485 chip such as the sp490 or max490 work with ccs?

do you use the following code without the enable, you normally use with the half duplex rs485, as t ...

Hi there, is it possible to generate a door bell sound such as a ding dong from a pic microcontroller.

If so, can some guide me on how to go about doing this?

I know you can get separate ic whic ...

hi there, i checked the connection and they look fine, but i think there is a problrm with something else as, i have found sometime both rs232 ports work, and sometimes it gives 00 00 00 00. so i trie ...

I'm using 4.104 and its on hardware.
thanks

Hi there,

I have tested my code on the 16F877 and it works brilliantly. I have had
to change to the 18F6622 as I need two hardware usarts now.

So when I connected up the 18f6622, I started to ...

By putting s[len] = '\0'; in, it has solved the problem of the three zeros! I get two constant zeros in front on each scan, which I can work with. Thank you so much, it was small mistake, but so har ...

oo what a stupid mistake, i have changed to the following:

#define RFID_START_BYTE 0x02
#define RFID_END_BYTE 0x03

now the output is:

002B56AB67F1
0002B56AB67F1
0002B56AB67F1 ...

this is the data sheet for the ID12 RFID sensor:

http://www.coolcomponents.co.uk/resources/ID12/ID-12-Datasheet.pdf

thanks

piire

Hi there
I'm trying to get RFID tag id on to the computer. I'm using a ID12 RFID sensor. It has a RS232 port which I have linked to the PIC16F877A.

I'm using the hardware UART for the RFID and sof ...

Thanks alot for your help. The system works, I do sometimes have to press the button twice to turn the led on, but I guess thats to do with the processing power of the PIC.

Thanks alot got your all ...

Hi there

I looked at your code thanks alot, but I need to connect more leds to do other operation and this code wont work for this task.

Can I use the set_tris_ operation to set inputs and outp ...

Hi there, I'm trying to make a simple push button program, which turns on a led when it is pressed and then turns it off when pressed again. I have connected the + side of the led to pin C4. The push ...

Hi there,
I'm doing a project where I have a sensor which is connected to a pic microcontroller and then to a max232 chip. I have coded the microcontroller to output the data from the sensor to the ...