Serial input

philipad23

Hi all,

I am using Holtek HT12E to build a remote control that is sending data to thae Basic Stamp 2. I can cleary see the signal on the oscillocope so I can culculate the frequency of transmition of pulses. What I dont know is how I can find the Baud that I must specify
at the SERIN command?

Does anyone know how to calculate the Baud Rate?


Thanks

PJAllen

The baudrate, or bits per second, is 1 / time of 1 bit (the reciprocal of the period of 1 bit width).· You have a scope, so you may be able to determine that, if you really crank it up.
·
1200 bps is esentially 1200 Hz.
The time for each bit = 1 / 1200
······················=· 833 usec
If a bit is 833 usec, then the bit rate = 1 / 833usec
········································= 1200 Hz (bps)

Once you know that, then you can look up the Baudrates in the tables provided in PBASIC Help.






Post Edited (PJ Allen) : 3/2/2006 9:08:12 PM GMT

stamptrol

If you Google Holtek HT12E, the data sheet is available on the first hit.

It is actually an encoder chip which transmits data serially, but not in the usual RS-232 format. Seeing as how the matching HT12D is the decoder, it makes sense to use the pair.

Cheers