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RE: 1-wire occasionally stops working
Hi everyone,
In these cases, this guide can help: https://kb.unipi.technology/en:sw:01-mervis:automatic-restart-of-1-wire-hidden
Unfortunately, if you have improperly processed cabling, or if you have a large number of sensors connected to this bus, you cannot achieve the desired stability, because the 1-Wire bus is very sensitive to interference.
In this case, I recommend checking the wiring to make sure you have all unused wires and the cable shield connected to the ground terminal. Next, check the length of the bus and the number of sensors on the bus.
An alternative to this connection is also the connection of sensors via Extension xG18, which has 8 separate 1W channels, each reserved for one sensor. Perhaps the only disadvantage of this module is that it is possible to connect only sensors DS18b20 and supporting parasitic power.
Finally, I also recommend reading this article about 1-Wire: https://kb.unipi.technology/en:automation:02-glossary:1wire-hidden
Best regards,
Antonin, Unipi -
RE: Is it possible to program UNIPI in Node-red and at the same time also in Mervis IDE?
Hi everyone,
Currently this is possible by flashing Mervis OS and then installing Node-RED following the standard installation instructions: https://nodered.org/docs/getting-started/raspberrypi
However, this solution is not tested and we cannot guarantee that the Mervis RT will behave correctly if other such demanding SW is running on the controller.
Best regards,
Antonin, Unipi -
RE: Patron's service mode and USB stick recovery no longer work.
Hi @Vesa-Kauppinen,
try apt update && apt upgrade again.
We made some adjustments due to the new Unipi Iris HW, but this should work fine now.Best regards,
Antonin, Unipi -
RE: Patron: image with NodeRed preinstalled
Hi @lukec,
You can try the current Node-RED image, which is available at this link: https://kb.unipi.technology/en:hw:007-patron:download-image:02-nodered
Best regards,
Antonin, Unipi -
RE: How to update NODE.js, NPM and NodeRed?
Hi @JakubSzlaur
The documentation is really old, but this command looks functional. As recently as last year, someone used it for an update (link to the Node-RED forum), but I didn't test it.
We will also soon release a new Node-RED OS with the current Node-RED v3. Which is also a certain possibility to update.
Best regards,
Antonin, Unipi -
RE: KLEFR Electricity meter
Hi @ArnieX,
Thank you for your post.
This is a typical error when setting up communication with INEPRO/KLEFR electricity meters, and it is really necessary to be careful when setting up other devices (modbus tables).Best regards,
Antonin, Unipi -
RE: Zvyšená latence 1-wire
Dobrý den,
tyto moduly jsou z prvopočátků vývoje a bohužel se k nim nedochovaly potřebné manuály. Pokud však došlo ke zpomalení komunikace po aktualizaci na novější verzi, hledal bych různé intervaly komunikace (např. u komunikačních skupin) a nastavil je na 0ms.
Případně zkuste připojit modul 1W-4R-4DI přímo na 1-Wire sběrnici zařízení Unipi 1.1.
Přeji hezký den,
Antonín z Unipi