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Me No Dev
@me-no-dev
that it is :)
Develo
@devyte
thx for the video
Victor Tseng
@Palatis
the create task / pin task stuff is correct
Me No Dev
@me-no-dev
it's all generally correct
could have given a better example of dual core operations though
Victor Tseng
@Palatis
like dual core lzma?
XDX
Develo
@devyte
Nah, I know about realtime OSs, implemented a tiny one myself way back. It's clear enough to me: you can bring up tasks, assign them to a specific core, and there are semaphores available. And the sketch is a task by itself, probably with higher priority
Me No Dev
@me-no-dev
actually it's idle priority and the only task running on core1
Develo
@devyte
Ah, ok
Me No Dev
@me-no-dev
so if you stick to regular Arduino programming, you should get as close as possible to what you would expect
Develo
@devyte
Lol you already got an issue opened in your ESPAsyncUDP repo about lwip2
I didn't want to do that because the whole lwip2 thing is supposed to be experimental
ZaPpInG
@lrmoreno007
@brutzler I prefer to use Telnet, so in addition to receiving messages from Debug I can send commands 😉
Develo
@devyte
@me-no-dev I think you're gonna get a kick out of this:
I monitor the esp repo by the email notifications, and it's been really quiet for something like a week now
It just occurred to me that my daughter almost always trolls me for my phone when I'm looking at emails or st the repo, so I checked the repo notifications settings.... and turns out they're on ignore -.-
Develo
@devyte
My 2yo daughter turned off the repo notifications.... oh, and it was on purpose, I passed the phone to her with the repo webpage visible, and she immediately went up and turned them off in front of me o.O
Next step: teach her how to gi
Sigh I give up
Git*
brutzler
@brutzler
Hi, wanted to make an ESP-Wifi-meat-thermometer. with something like a lance to sting into the meat. Has anybody a idea what sort of sensor I could use?
MOAMIndustries
@MOAMIndustries
depending on the temperature ranges
maybe some sort of thermocouple
bobcroft
@bobcroft
@brutzler , There are K type thermocouples specifically for that purpose and there are also thermocouple interfaces that use I2C. I have such an interface sold by 'Tautec' in the USA but I would think a Google search would turn up others.
Bert Melis
@bertmelis
Question: I was changing a large portion of my code and after I was done, I saw a size increase of 20kB of my firmware .bin. Now I wondered it was because of bad code or it was because of the upgrade to lwip2
does everybode see this size increase after moving to lwip2?
oh wait, I can find out myself. I didn't notice the handy menu item in Arduino IDE (mostly working in Pio).
Bert Melis
@bertmelis
so, assume makes an ass of u and me
firmware lwip size
old V2 404919
old esp 411095
new V2 404991
new esp 411167
And the idea with a I2C-thermocouple-interface sounds good. Already thought of K-Type or similiar, but was afraid how to connect them to an ESP directly?
bobcroft
@bobcroft
@brutzler , There is no way to be sure what those probes are but they do not have the correct thermocouple plugs so they are more than likely thermistors. The other possibility is that they are Pt 100 probes. If they were thermistors and you could find the data on them then they would be easier to implement than J or K type thermocouples. I have never used Pt 100 probes. To some extent it depends on the temperature range you want to measure, thermocouples can go to very high temperatures. Thermistors are not linear in their output but a formula (Steinhart-Hart) can be used to linearize them. I think there is an Arduino library for using thermisters.
Thermocouples need cold junction compensation and the correct connecting plugs/cables otherwise parasitic junctions are formed.
brutzler
@brutzler
@bobcroft I agree with you, that there is only an audio-plug and not the typical green NiCrNi-plugs. Therefore I am with you, that they are PT100.
brutzler
@brutzler
No, its no PT100 (or PT1000). Just measured @ the probe of my meat-Thermometer ant I had a value of 15,54kOhm @67°C.
PTC/NTC???
bidyutper
@bidyutper
Help need #WiFiManager issue #87.. keep trying reconnect after power failure..And ondemandPortal need only at bottom trigger..
brutzler
@brutzler
OK, I will order some of this probs for my project and looking for a matching sheet of temp<->resistance. Or making my own with measuring.
But now its interesting, how to measure resistance with a ESP. I have a AS1115 breakout board. (ADC with I2C) Do you think this will work?
Shawn A
@tablatronix
Is it possible to retreive
Is it possible
Luc
@luc-github
Hi seems git is 2.4rc2 but staging is not updated for a while - any idea when the 2.4 release is planed ?
Develo
@devyte
No date available for 2.4 yet. There is a (long) list of bugs and PRs that still need to be processed for the final 2.4.
Luc
@luc-github
Ok Thank you - and any plan to update http://arduino.esp8266.com/staging/package_esp8266com_index.jsonwith 2.4rc2 ?
Shawn A
@tablatronix
anyone know, if it Is possible to get max_tpw, is it stored in rf cal memory somewhere
Bert Melis
@bertmelis
After testing with lwip2, I have to say: it is FAST! A bit too fast, as it is closing my (telnet) server faster than it could print the line to say it was going to close the connection. But I'm not complaining. :smile:
bobcroft
@bobcroft
@brutzler Hi I think the probes are probably NTC thermistors. I work with gas boilers and values on thermistors used on boilers are commonly 15K at 70°C. An external I2C ADC would give you more scope since it would give you a wider input range of say 0-5 V whereas the internal ADC on the ESP8266 is only 0-1 V. You could either use a resistive divider or a capacitor charge / discharge circuit depending on your required range and accuracy requirement. I am sure a Google search will yield some helpful information.
Regarding calibrating your probe that is fairly easy if you have something like an existing digital thermometer to compare it to. Otherwise you need the data sheet to get the beta (B) value for the particular thermistor.
brutzler
@brutzler
@bobcroft Yes, in the meanwhile I figured out, that it is a NTC 100K (also known as 104AT).
I am just struggling with the I2C-ADC. The considered part (ADS1115) can measure 2-5V (Why starting at 2V??). Even more than the ADC of the ESP. But if I would find one with 0-5V it would be a better resolution. Even if I supply the whole stuff only with 3,3V.
Resistance divider is what i thought of. Charge/discharge unit never used before. Will have a look on this too.
bobcroft
@bobcroft
@brutzler 2 to 5 volt is the power supply range it can measure from 0 to 3.3 volt if 3.3 is what you power it with. Adafruit do a nice write up on their version of the ADS1115.
brutzler
@brutzler
@bobcroft hey you are right. its measuring from 0 to VCC. There was some info, I missunderstood.
OK nw its easy. Some voltage divider, some calculating, comparing with a reference.... all done (hopefully)
thx!
brutzler
@brutzler
Hi, I want to power one of my NodeMCU with a LiPo-battery. To extend lifetime of the battery, I heard about sleep modus. Is there any good example for this?
bobcroft
@bobcroft
@brutzler Hi glad the information I gave helped. It occurred to me that up to about 125°C you could compare your probe to a DS18B20 temperature sensor. THE DS18B20 is reasonably accurate and there are loads of sketches and other information on the net. Alternatively you might be able to borrow a calibrated temperature measuring instrument with which to compare your sensor.