- orphaned, outdated

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    dthowto.txt -> 1.2

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-
-    Howto build a Serial Adapter for Dallas DS1820 temperature sensors
-
-          Copyright (c) 2001 by Brian C. Lane <bcl@brianlane.com>
-                          All Rights Reserved
-
-
-
-  The DigiTemp program for Linux, DOS and Windows 95 uses a simple serial
-port adapter to communicate with the Dallas DS1820 digital temperature
-sensors. These sensors use a protocol called One-Wire or Micro LAN
-(depending on which Dallas documentation you are reading). This protocol
-requires only a ground and a data wire to the device. All power is derived
-from the data line while it is idle.
-
-  The protocol is NOT RS232! The adapter converts the RS232 voltages into
-the +5v needed to communicate with the DS1820. Each byte sent to the serial
-port represents one data bit to the DS1820. See Dallas Semiconductor App
-Note #74 for more information, or the sourcecode for DigiTemp.
-
-  How To build an adapter
-  -----------------------
-
-  If you want a schematic diagram you need to look at page 20 of App.
-  Note #74 from Dallas Semiconductor ( )
-
-  
-  Parts List
-  ----------
-
-  1   DB-25 connector or DB-9 connector
-  1   1.5k ohm resistor
-  2   1N5818 Schottky Diode
-  1   1N5228 3.9v Zener Diode
-  1   1N5234 6.2v Zener Diode
-  1   2 position terminal block (for connecting the sensors to adapter)
-
-  Wire cutters and a soldering iron.
-
-  In this document I will refer to the pin functions. The pin numbers for
-  DB-25 and DB-9 are as follows:
-
-  Name    DB-25    DB-9
-  ----    -----    ----
-  DTR      20       4
-  RXD      3        2
-  TXD      2        3
-  GND      1,7      5
-
-  NOTE: I have not built a DB-9 version myself. Please let me know if you
-        successfully build one or have problems with it.
-
-       On the DB-25 pins 1 and 7 must BOTH be connected together.
-
-
-  Step          Description
-  ------------------------------------------------------------------------
-   1.           Solder the 1N5228 3.9v Zener between GND and DTR with the
-                Cathode(the stripe) towards DTR.
-
-   2.           Solder the 1.5k ohm resistor between RXD and TXD.
-
-   3.           Solder one of the 1N5818 diodes between RXD and TXD with the
-               Cathode(the stripe) towards RXD.
-
-   4.           Solder the other 1N5818 diode between RXD and DTR with the
-               Cathode(the stripe) towsrds DTR.
-
-   5.           Solder the 1N5234 6.2v Zener between RXD and DTR with the
-               Cathode(the stripe) towards DTR.
-
-   6.           Solder RXD to one pin of the terminal block and paint it
-                black. This is the GND connection for the sensors.
-
-   7.           Solder DTR to the other pin of the terminal block and paint
-                it red. This is the DATA connection for the sensors.
-
-
-   There! Now you have an adapter.
-
-   Connecting the sensors
-   ----------------------
-
-   You need to connect to wires to the sensor to attach to the terminal
-block. If you look at the sensor so that the label is towards you, with the
-pins facing down the pins are from left to right:
-
-   1. GND
-   2. DATA
-   3. +5v
-
-   Solder your wires to GND and DATA and connect them to the terminal block
-and you're done! Be careful not to overheat the sensor while soldering to
-it. My method is to tin the legs quickly and let them cool off (while
-tinning the others) and then to tin the wires, then attach them quickly with
-a minimum of heat applied.
-
-  One additional note: Because of the voltage(and current) drop across the
-resistor this adapter isn't capable of providing enough current to read
-temperatures above about +70C. This is a limitation of the design, not an
-error with the DS1820 or the software.
-
-  If you have any questions or comments, email me at bcl@brianlane.com or
-subscribe to the digitemp mailing list by sending a blank email to
-digitemp-subscribe@brianlane.com
-
-   Brian Lane
-   bcl@brianlane.com
-   http://www.brianlane.com
-
-   March 13, 2001