[arm-allstar] Adding sensor

[Doug Crompton]

Probably a good choice if you were a serious 1wire user but the for just
humidity and temperature it would be rather expensive. I would still opt
for the weather station approach or a simple Arduino. The Arduino is fun to
play with. We have an Arduino write script to program an Arduino in the
hamvoip code. Here is an example of how easy and cheap it is -

https://howtomechatronics.com/tutorials/arduino/dht11-dht22-sensors-temperature-and-humidity-tutorial-using-arduino/


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Thu, Feb 28, 2019 at 12:30 PM Willem Schreuder <willem at prinmath.com>
wrote:

> On Thu, 28 Feb 2019, "Doug Crompton via ARM-allstar" wrote:
>
> > All you need is the 1wire to USB interface and you can daisy chain the
> > sensors wherever you want.
>
> Using the USB interface is probably more tolerant of high RF.  You can
> also get some HATs that do a bit better isolation or for the very brave
> the kernel supports connecting straight to pin 18 if you enable the kernel
> module in raspi-config.
>
> If you want a more off-the-shelf but very robust solution I have used
> these
>
> https://www.embeddeddatasystems.com/OW-SERVER-1-Wire-to-Ethernet-Server-Revision-2_p_152.html
> I buy the server from EDS ($100 for a fully self contained and hardened
> ethernet based web server designed for industrial use) but buy the sensors
> from Mouser or a similar source and wire them up myself for a tiny
> fraction of the cost of buying their sensors.  For example, the DS18S20+
> temperature sensor is about $3 each from Mouser in a TO92 package ($4.50
> from EDS), so I put one on the heat sink of every machine and just wire
> them all in parallel.  Read time is about 1 second per sensor.  EDS also
> sells some "packaged" sensors but that gets expensive fast.
>
> ================================================================
> Dr. Willem A. Schreuder,  President,  Principia Mathematica
> Address:  445 Union Blvd, Suite 230,  Lakewood, CO  80228, USA
> Tel: (303) 716-3573   Fax: (303) 716-3575
> WWW: www.prinmath.com   Email: Willem.Schreuder at prinmath.com
>