1 Master - Multiple Slaves

Guest · Posted: Mon Jan 29, 2007 1:56 pm

Hello

I need to implemente a network with one master and 10 slaves. Eatch slave (16F628A) have a temperature sensor and the master(18F4550) will ask eatch slave for the value of themperature and print on a lcd (Maybe write on a MMC/SD card too).

I know that ccs compilier has rs485 driver and thats i choose.
Do you think it's the best and easy way of doing it?

Thanks

Neutone · Joined: 08 Sep 2003 Posts: 839 Location: Houston

How far apart are the slaves? How fast does it have to run? Maybe you could use I2C.

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

The 16F628A doesn't have a hardware I2C module integrated, so I2C is not an advisable option. This PIC does have a UART module, so RS485 seems like a good option (depending on speed and distance requirements).

Guest · Posted: Tue Jan 30, 2007 7:35 am

Thanks for the reply

The slave board will work at 4mhz (int osc) and the Master at (20mhz).

6 of the slaves will be at 15 meters and 3 at 60 meters and one ate 100meters.

Can i use rs485 with sn75176a?

thanks again.

Guest · Posted: Tue Jan 30, 2007 2:03 pm

seems like a situation suitable for the dallas one wire bus and dallas thermocrons.