I have recently got a TL-300 and using this code as a base I have integrated it into my monitoring system. I use a combination of hardware – 1-wire, X10, power monitoring, UPS and now Arexx.

The code has been modded to send the values from the sensors using TCP/IP to a server process which holds all the values.

This is then interrogated to produce web based graphs. See the website for more details. The temperature link shows 4 temperatures. Outside temp is from a 1-wire sensor, study is from the energy monitor and teh other two are the Arexx sensors.

Negative temperatures are working now. See m68k’s post.

But there’s another problem: Humidity over 60%. See http://www.arexx.com/forum/viewtopic.php?f=43&t=1324 (german) for a longer post.

Solution: Change formula for humidity.

Replace

0.6 + value * 0.03328

with

0.698847572766711 + 0.0322868348833273*value + 0.00000175838509577984*value*value – 0.000000000764068120532725*value*value*value

Bye

Sven

The cast to a signed 16 bit int is important for handling temperatures below zero.

Sensor type can be detected as (0xf000 & sensor_id) which gives 0×2000 for temperature and 0×4000 for humidity sensors.

The simple logging application described at http://rndhax.blogspot.com/ has been updated with these changes.

“Further investigation shows us that we can calculate the measurements [...] temperature sensors TL-3TSN by (Rawdata * 0.0078) °C. ”

Well, that seems to be true for positive values – but not for negative. This night my TL-3TSN recorded a stalled raw value of “7″ for about 5 hours. Other temperature sensors got a temperature of -2.0C.

The specs of TL-3TSN tell us that they work from -30C to +80C… so there must be an other bit/byte which indicates negative temperatures. I’ll now active a dump data file in my daemon – maybe it could help finding the missing informations.

Bye & THX again for your work so far!

Sven

http://rndhax.blogspot.com/2010/03/friendlyarm-mini2440-arexx-tl-500.html

I just received two TL-3TSN revision 059 sensors with ID 11600 and 11639 respectively, as well as a waterproof TSN-33MN with ID 11807.

This would mean that both assumptions regarding ID numbers are incorrect.

TSN-33MN seems to use the same 0.0078 calibration factor as TL-3TSN.

many thanks for your Work.

Stefan

the ID will of course be different, but I bet the protocol will be similar. But no guarantee.

Cheers, Kornel.