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Meet je Stad!

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15 Oct 2020
@ommat:matrix.orgTammo ter HarkWe have started a FAQ / Q&A which will be open for all people interested in MeetJeStad. It is open now at: http://forum.meetjestad.net/ It is our intention to open this up soon and to add a link on the website (https://www.meetjestad.net) Can you think of more questions (and preferably with answers...) that we can place there? Please sign up and add questions and answers!12:12:48
@matthijs:matrix.orgMatthijs Kooijmanommat: Wouldn't something like "questions.meetjestad.net" be more appropriate? I can imagine we'd want a more traditional forum as well later, and then it would be annoying to have forum. already taken?12:50:34
@diana:matrix.orgDianacan be used for both, it actually is meant to be a forum, but we have already put in some questions that we have recently had to answer a lot, so we can tell people: look at the forum first.14:15:37
@giplt:matrix.orgHarmenWould be great to hear your suggestions on how to add structure to the site: which categories, topics, code of conduct etcetera...14:26:29
@matthijs:matrix.orgMatthijs KooijmanIt looks very question-centered, not so much suitable for announcements or general discussion (but I guess it can be used for that if we want)14:41:08
@Paul_B:matrix.orgPaul_BAgree with Matthijs, I see that there are catagories. So we could make a sort of forum using them and for discussions keep questions unanswered? 17:16:56
@giplt:matrix.orgHarmenMaybe questions is the wrong word, I guess we could change the vocabulary into topics and contributions in stead of questions and answers...17:25:42
18 Oct 2020
@ommat:matrix.orgTammo ter HarkDear all: next wednesday it is the 21st of October. We would like to invite all people that are and have been active during the recent years to attend the meeting and to celebrate with us the third place in the Trouw Duurzame top 100 (Sustainable top 100 of one of the main Dutch news papers). Please find details in: http://www.meetjestad.net Ha, komende woensdag is het weer de 21e en dat is de dag in de maand dat we altijd een MeetjeStad bijeenkomst hebben. Kijk in de agenda op: http://www.meetjestad.net en vier die avond met ons mee dat we de derde plaats hebben in de Trouw Duurzame top 100 van 2020.17:46:10
20 Oct 2020
@Paul_B:matrix.orgPaul_BI've run into an issue with adding the soil moisture (I2C) sensors to the current platform, sometimes the sketch hangs. The sketch uses the build-in Wire library and it likely hangs in the Wire.endTransmission() function. Anyone familliar with this issue / knows a work-around? 08:27:55
@matthijs:matrix.orgMatthijs KooijmanPaul_B: Yes. The cause is probably noise on the I2C bus (I2C is not really intended to run over longer runs of cable, it was originally designed to be between chips on the same PCB). This noise likely causes the I2c hardware to mess up and lockup, which is not detected by the Arduino code.08:30:40
@matthijs:matrix.orgMatthijs KooijmanHowever, recently a timeout feature was added to the Wire library, which should at least prevent locking up in these circumstances. You need the latest AVR core for this, see https://github.com/arduino/Arduino/issues/10803 for the WIP documentation for this new feature.08:32:09
@matthijs:matrix.orgMatthijs KooijmanIdeally, you'd also fix the underlying cause (e.g. if it is indeed noise, by using shielded cable)08:32:47
@pilla:matrix.orgpilla
In reply to @ommat:matrix.org
Dear all: next wednesday it is the 21st of October. We would like to invite all people that are and have been active during the recent years to attend the meeting and to celebrate with us the third place in the Trouw Duurzame top 100 (Sustainable top 100 of one of the main Dutch news papers). Please find details in: http://www.meetjestad.net Ha, komende woensdag is het weer de 21e en dat is de dag in de maand dat we altijd een MeetjeStad bijeenkomst hebben. Kijk in de agenda op: http://www.meetjestad.net en vier die avond met ons mee dat we de derde plaats hebben in de Trouw Duurzame top 100 van 2020.
I want to attend tomorrow. But the webpage won't recognize me, and there is a "page not found" when I try to recover my account. What shall I do?
09:42:33
@kvoeveren:matrix.orgKees van OMaybe even beter to use shielded with RS432 serial protocol. This is more intended to bridge distances. I2C is more system internal device to device. I've figure how the code seize compares.09:43:06
@matthijs:matrix.orgMatthijs Kooijmanpieter.sijbrandij: I don't think you have an account on meetjestad.net yet. But you do not need to log in to the website to attend tomorrow, you can just join by clicking the link in the news item (https://telefoon.planb.coop/meetjestad)09:46:12
@matthijs:matrix.orgMatthijs Kooijmankvoeveren: Yeah, using a differential protocol is even more robust (you mean RS482 I suppose though, RS432 does not seem to exist :-p)09:47:12
@kvoeveren:matrix.orgKees van O??? Scherp maar ik bedoel RS485. Add on modules ca. 0,40 Eu p/s. Iedere zijde 1 werkt prima ook over afstanden.10:06:20
@kvoeveren:matrix.orgKees van Oimage.png
Download image.png
10:06:33
@matthijs:matrix.orgMatthijs KooijmanMaar niet zomaar toepasbaar als je bestaande sensor alleen I2c doet, dan moet er weer een extra microcontroller of ander IC tussen.10:42:15
@Paul_B:matrix.orgPaul_B
In reply to @matthijs:matrix.org
Paul_B: Yes. The cause is probably noise on the I2C bus (I2C is not really intended to run over longer runs of cable, it was originally designed to be between chips on the same PCB). This noise likely causes the I2c hardware to mess up and lockup, which is not detected by the Arduino code.
Thanks! I'll look into the new AVR core for the short term fix. An alternative protocol/shielded cable would be great to include in a new prototype iteration. Or switch to a stand-alone node perhaps, although we might run into LORA range issues then.
10:58:15
@Paul_B:matrix.orgPaul_BIs the latest Core 1.8.3 or is this a (beta/other) version we need?11:13:25
@matthijs:matrix.orgMatthijs KooijmanShould be the latest stable release11:15:23
@matthijs:matrix.orgMatthijs KooijmanBut also check the github link, since the timeout is not enabled by default11:15:39
@peterdm:matrix.orgPeter dM
In reply to @matthijs:matrix.org
However, recently a timeout feature was added to the Wire library, which should at least prevent locking up in these circumstances. You need the latest AVR core for this, see https://github.com/arduino/Arduino/issues/10803 for the WIP documentation for this new feature.
@Paul_B, at the moment the resistors loading the I2C (R2, R3) at the sensor side are 3k3. Have you considered lowering their value ?
11:17:30
@matthijs:matrix.orgMatthijs KooijmanStrong pullups can indeed help, yeah (though be careful to not overload the I2c devices, smaller pullups means more current to pull the bus low)11:21:57
@peterdm:matrix.orgPeter dM
In reply to @matthijs:matrix.org
However, recently a timeout feature was added to the Wire library, which should at least prevent locking up in these circumstances. You need the latest AVR core for this, see https://github.com/arduino/Arduino/issues/10803 for the WIP documentation for this new feature.
... and there is SoftWire, which I use to connect 6 identical sensors to the same Arduino.
11:56:21
@peterdm:matrix.orgPeter dMWe have seen that Si7021 humidity measurements would reach up to 119, to then continue from -6 and therefrom upwards. There is a fix now for that, which adds 125 to some of the measured values:11:59:11
@peterdm:matrix.orgPeter dMmjs_fhum_0100_02w.png
Download mjs_fhum_0100_02w.png
12:00:04
@peterdm:matrix.orgPeter dMThe thin blue line are the original measurements, the thick blue line are the corrected measurements. The vague bluegrey line are the KNMI measurements. https://meetjestad.net/static/graphs/fixhumi shows the original and corrected measurements for 7 standard sensors and 6 experimental testsensors, for several time-spans. It looks to me that sensors 100 and 410 and testsensors 1, 4, 5 and 6 are working in an acceptable way with this correction. Without this correction, these sensors would probably be written off as unusable.12:15:32
22 Oct 2020
@jose_martin:matrix.orgjose_martin left the room.19:50:51

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