#garfield Logs

Nov 15 2012

18:08 TELunus|2 I was looking over the list of chanels on freenode, and I noticed that some start with one #, some start with two. Is there a difference?
18:11 Tom_itx kinda
18:11 Tom_itx but not really
18:11 Tom_itx # are supposed to be official and ## are not
18:11 Tom_itx freenode made a big hoo haa about it a while back but not much came of it
20:21 rue_mohr as expected
20:22 Tom_itx wanna help?
20:23 Tom_itx http://datasheet.octopart.com/B57560G104F-EPCOS-datasheet-16188.pdf
20:23 Tom_itx B57560G0104F000
20:23 Tom_itx on a 4.7k resistor divider
20:24 Tom_itx need to create a temp table for it
20:24 Tom_itx 150-235 c
20:24 Tom_itx range
20:24 Tom_itx part starts on P50
20:25 rue_mohr good luck
20:25 Tom_itx have you tried?
20:29 Tom_itx are the adc on avr 8 bit?
20:30 Tom_itx 256 or 1024?
20:38 rue_mohr their formulas are out to lunch
20:39 Tom_L well, the resistance is in the pdf for each temp
20:39 Tom_L in 5c increments
20:40 rue_mohr ah, your not trying to use the code that generates the header file with the table
20:41 Tom_L no i'm trying to figure out what they did and just plug in some good values
20:41 rue_mohr not even they know
20:42 Tom_L they have some silly constant i have no idea what it's for
20:42 rue_mohr there are a few
20:42 Tom_L maybe a multiplier for the PID loop or such
20:42 rue_mohr there was a hint its the resistance of the wire to the sensor
20:43 Tom_L what's 107.8 in k?
20:43 Tom_L r to k
20:43 Tom_L .1078>
20:43 Tom_L k
20:49 rue_mohr what I can learn is that I need to know the resistave for my sensors at 25c
20:50 rue_mohr k I think represents the slope of the Resistance/temp graph
21:00 Tom_L rue_mohr is the beta value in that pdf 4036?
21:00 rue_mohr if I say no, am I right?
21:00 rue_mohr I dont see anything called beta
21:01 rue_mohr which useless online calc re you trying to use?
21:01 e_mohr waves at i
21:01 Tom_L http://calculator.josefprusa.cz/#TempLookup
21:01 Tom_L i'm looking at that
21:02 Tom_L R0 is 100000, t0 is 25, beta is 4036, r1 is 1655, r2 is 4700
21:02 Tom_L is what i entered
21:02 Tom_L for test values
21:02 rue_mohr in that case they give you 3 beta numbers
21:02 Tom_L the R1 i got from the tables in the pdf starting at 150c
21:02 rue_mohr 25-85, 0-100, and 25-100
21:02 rue_mohr wait wait wait
21:03 rue_mohr lets find a dk part number for something they use and compare the values they used to the datasheet
21:03 Tom_L his part is on P51 52
21:03 rue_mohr what is the part number itself
21:04 rue_mohr none of the betas are 3947, but two of them are 3497
21:04 rue_mohr think there is a typo?
21:04 Tom_L B57560G0104F000
21:05 rue_mohr none of the betas are..
21:05 rue_mohr wait
21:05 rue_mohr thats the 0-100 beta
21:05 rue_mohr of R0 is 100000, t0 is 25, beta is 4036, r1 is 1655, r2 is 4700
21:05 rue_mohr B0-100 is 4036
21:05 rue_mohr so beta is really beta0-100
21:05 Tom_L so the 4036 number was right?
21:06 rue_mohr look at page 3
21:06 Tom_L it says R/T number
21:06 Tom_L P3 of what?
21:06 rue_mohr look at page 3
21:06 Tom_L the pdf?
21:06 rue_mohr http://datasheet.octopart.com/B57560G104F-EPCOS-datasheet-16188.pdf
21:06 Tom_L ok
21:07 Tom_L also at the top of the table on P51
21:07 Tom_L R/T No. 4036
21:07 rue_mohr now what are R1 and R2
21:07 Tom_L r1 is 4700
21:07 Tom_L r2 is the thermocouple
21:07 rue_mohr why, what is that
21:07 Tom_L i started with 1655 because the start range is 150c
21:07 rue_mohr oh R1 is the 4.7k
21:08 Tom_L yes it's a divider in the ramps board
21:08 Tom_L the 4.7k is to 5v
21:08 Tom_L the thermistor is to gnd
21:09 rue_mohr http://calculator.josefprusa.cz/#TempLookup <-- r2 cant be the RTC, its part of the calcs
21:09 Tom_L i dunno then
21:32 Tom_L i wanted to implement a bot like that
21:32 Tom_L i have one i think will do it
21:33 Tom_L but the logs for it are horrid
21:33 rue_mohr its easy to make modules for tobbor
21:37 Tom_L that one i was playing with has all those modules
21:37 Tom_L i just didn't know how to use em
21:41 Tom_L if i were more into 'helping' as i used to be i might persue it again
22:02 Tom_L http://hydraraptor.blogspot.co.uk/2007/10/measuring-temperature-easy-way.html
22:02 Tom_L rue_mohr, did you try the code at the bottom of that page??
22:02 rue_mohr probably, but the numbers made no sense at the time
22:03 rue_mohr 0 is really open circuit, wouldn't have guessed that
22:07 Tom_L http://reprap.svn.sourceforge.net/viewvc/reprap/trunk/reprap/firmware/Arduino/utilities/createTemperatureLookup.py?view=markup&pathrev=3448
22:07 Tom_L another one
22:09 rue_mohr interesting
22:09 rue_mohr I have a webpage I made, based on code from a document
22:10 rue_mohr and it calculates the beta properly from the 0c and 100c R values from the datasheet
22:10 rue_mohr iirc its unposted javascript
22:10 rue_mohr let me post it
23:37 TELunus|2 if m/V is volumetric density and m/L is linear density what do I call m/A?