Shop OBEX P1 Docs P2 Docs Learn Events
Holly PWB Batman!! — Parallax Forums

Holly PWB Batman!!

doggiedocdoggiedoc Posts: 2,246
edited 2012-10-12 21:56 in General Discussion
So... I'm rummaging through my vast depths of all things Parallax. I'm looking for a DS1302 that I think I might have tucked back in there somewhere. Nope.

Alas, I come across this! I'm pretty sure it dates back to about 1997!

PWB.jpg

Has anybody used one with the propeller? I'm thinking a simple serial object would do the trick. The specs show asynchronous serial at 2400, 4800, and 9600 baud rates. I've attached the original datasheet form Solutions Cubed.

Paul
pdf
pdf
CA95765.pdf
129K

Comments

  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 10:22
    I have one of those tucked away also :) Plus several other items from Solutions Cubed. I just wish I could sell those parts.
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-10-12 20:48
    Thus far I have not been successful at communicating with it with a Prop. I may give up.
  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 20:59
    Are you supplying at least 4.0V?
  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 21:04
    doggiedoc

    Not trying to insult you, just sometimes I myself overlook the simplest things.

    Bruce
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-10-12 21:10
    5V - or I was, I've tried both now. 3.3V should work. Datasheet indicates VCC from 2.5 to 5.5V. I suspect my troubles are with the serial comm.
  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 21:11
    Correction: Datasheet says 4.0 MIN
  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 21:15
    I am going to start experimenting tomorrow with some other stuff... I may take a peek myself
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-10-12 21:18
    Sorry I was referring to the spec Sheet - http://www.parallax.com/dl/docs/prod/comm/pocketwatchb.pdf
  • idbruceidbruce Posts: 6,197
    edited 2012-10-12 21:22
    Looks like a lot of deciphering, but have you tried translating the BS2 code on the datasheet?
  • doggiedocdoggiedoc Posts: 2,246
    edited 2012-10-12 21:25
    Yes, and I see now on the data sheet the Min DC you stated. I stand corrected. I wonder what the 2.5V on the Spec sheet refers to?

    I'm going to have to call it a night on this one. I've changed it around so many times now.. I'm getting blurry eyed. :D
  • frank freedmanfrank freedman Posts: 1,983
    edited 2012-10-12 21:48
    doggiedoc wrote: »
    Yes, and I see now on the data sheet the Min DC you stated. I stand corrected. I wonder what the 2.5V on the Spec sheet refers to?

    I'm going to have to call id a night on this one. I've changed it around so many times now.. I'm getting blurry eyed. :D

    2.5V looks like the min value for a logic 1 or high state signal, 0.6V max value for a logic 0 or low state. Perhaps you could directly test it from your PC using the prop plug and say hyperterm @2400 (std with windows) or other serial terminal. May need to figure out how to send the command codes though. But what "I" really want to know, now that we are almost 13 years after the fact is .......

    Was it really Y2K compliant????
  • lanternfishlanternfish Posts: 366
    edited 2012-10-12 21:56
    Although I don't have one of these I do enjoy reading datasheets. And doggiedoc you have comitted a cardinal sin (according to some) by not posting your code or cct diagram of your hookup.
    Assuming that you have the TM pin connected (with appropriate in-line resistor) as an input to the Prop and the FM pin as an output from the Prop have you sent a '55'h to allow the Pocket Watch to auto-sync the baudrate.
    According to pg 9 of the datasheet, the Pocket Watch will ignore all data until it receives this '55'h data byte.
Sign In or Register to comment.