Post by thread:38400/19200 baud two way RS232 serial routine for

Hi everyone I am looking for sample 38400/19200 baud two way RS232 serial routines so that a basic stamp can talk to the a/d converter of a 12c671 chip. I want to tell the 12c671 which a/d channels to use and instruct the 12c671 to send the data back to a BS2. The 12c671 is the cheapest 4 channel, lowest pin count, 8bit, a/d converter I have seen. I'd like to use it. I'll bet a lot of you would too! Thanks Jon

Jon Petty wrote: > > Hi everyone > > I am looking for sample 38400/19200 baud two way RS232 serial routines so > that a basic stamp can talk to the a/d converter of a 12c671 chip. > > I want to tell the 12c671 which a/d channels to use and instruct the 12c671 > to send the data back to a BS2. The 12c671 is the cheapest 4 channel, lowest > pin count, 8bit, a/d converter I have seen. I'd like to use it. I'll bet a > lot of you would too! What Darren said about the BS2 running at 9600 is true. I can steer you to some comprehensive routines at: http://www.dontronics.com/convert.html But it makes me ask: Why would you learn PIC assembly then interface to a BS2? If you are going to this trouble, simply use the 671 instead of the BS2. Don McKenzie spam_OUTdonTakeThisOuTdontronics.com http://www.dontronics.com Don's Download Dungeon: http://www.dontronics.com/download.html Australian Electronics Ring http://www.dontronics.com/aering.html Win $500USD Cash. Micro design contest: http://www.simmstick.com

In a message dated 9/28/99 1:57:29 PM US Mountain Standard Time, .....DAZLOGANKILLspam@spam@AOL.COM writes: << stamp II only supports baud rates up to 9600 >> I just did a rs232 stepper motor controller with 12c508 at 38400. Worked great Jon

Are you saying your BS2 can work with baud rates > 9600 ? - if so, how ? Apart from the stamp, which language are you using ? and how are you running such high baud rates ? Out of interest, what is it you're making ? - some sort of engine management system ? Cheers, Darren

In a message dated 9/28/99 3:20:01 PM US Mountain Standard Time, donKILLspamDONTRONICS.COM writes: << But it makes me ask: Why would you learn PIC assembly then interface to a BS2? If you are going to this trouble, simply use the 671 instead of the BS2. >> There is not a simple answer to that question. I like the versatility of the BS2, but as you know it has timing problems and no a/d. I have configured by handheld NINO to run BS2 software. I can walk up to a vehicle and in minutes make program changes. In my last project I used a BS2 for decision making, eeprom and tables and programmed a 16F84 to: control servo position, monitor rpm, seconds output, output BS2 settable variable duty cycle and frequency outputs, motor control and 4 switch outputs all through RS232 comms at 9600. The program was a multitasking bear and input from the list helped me get the bugs worked out. The straight forward timing sensitive work can be accomplished in the 12c67. I can combine the two on a single board and use the a/d for one project, serial stepper motor controller , serial servo controller, pulse measurement or pwm output for others. Jon

In a message dated 9/28/99 4:17:53 PM US Mountain Standard Time, .....DAZLOGANKILLspam.....AOL.COM writes: << Are you saying your BS2 can work with baud rates > 9600 ? - if so, how ? Apart from the stamp, which language are you using ? and how are you running such high baud rates ? Out of interest, what is it you're making ? - some sort of engine management system ? Cheers, Darren >> I don't think I am doing anything special, but I have run 38400 with the BS2 successfully. I am using assembly for the PIC12c67. It is an interface for alternate fuel vehicles. The vehicles for this project are LNG liquid natural gas (cryogenic). Jon