'onewire - ERA-82-004'
| I'm trying to find the Schottky diodes used in the 12v real all
circuit used to interface serial ports to Dallas one wire devices
(Dallas app note 74). Its an ERA-82-004, and I can't find it, or a
cross refrence anywhere.
On a PIC related note: I've been designing a PIC based interface to
the DS1820 temperature sensors for the last couple of weeks in my
spare time. It has a 2k eeprom for serial number storage, max232 for
rs232 interface, and uses a LP2950 to regulate the power from the
RS-232's DTR and RTS lines. I was planning one producing these and
selling them for about $60, including 2 sensors. The purpose was to
take the load off the computer (and so that it would work under a
multitasking enviornment like Linux or Win95).
But I forgot something. I had read app note 74 a long time ago, and
I knew that you could use the serial port to directly talk to the
devices, but I forgot about it. No I know that my device really isn't
needed, and that it can all be done in software on the host, with 4
diodes and a resistor.
Needless to say - when you charge ahead on a project don't forget to
do your research first. At least I hadn't gone so far as to get boards
produced yet <G>.
Nexus Computing eskimo.com nexushttp://www.eskimo.com/~nexus
The Islet BBS FidoNet by PPP dialup (206)927-9219
Brian Lane embedded systems programmer KC7TYU
More... (looser matching)
- Last day of these posts
- In 1997
, 1998 only
- New search...