Hello everybody. I am quite new to node-red so I hope you bear with me. On January I started my first Raspberry Pi projects. Sooner or later I found out some visualization would be quite nice. So I run a search and found Node-red which was exactly what I was looking for. I started some small flows …

I reduced the readings to every minute and all is working fine now. Of course I don’t need to know the temperature every second and the HH:mm is also sufficient. I just want to do more readings per minute because it is nicer to see the changes during setup of the sensors. Nevertheless it is wonderin…

You probably need to inspect the insides of the code that actually does the read of the sensors - as quite often they have a “settle time” to allow the ADC to do it’s work and that can often be defaulted to a second or so…(because… why not…) in which case reading every second may start to back up re…

10 sensors of DS18B20 reading every minute works fine. As soon as I added the DHT22 sensor my Pi freezes again even though my reading is at every minute. When setup the DHT22 alone it works fine as well. I read the previous article but honestly it won’t help me much because I can’t read that code. A…

How are the sensors connected? i.e. are all the ds18b20’s on one or many circuits? what version of the BCM2835 library did you install? what version of NR? (You reported v8.11.3 but that is a version of node.js not node-red) what happens if you remove the code reading the ds18b20’s and just have th…

interesting… I just installed your flows and it hangs my Pi too. I’ll take a deeper look.

Sorry - but I am glad to hear that. Here my answers to your previous post: All my DS18B20 sensors are on one 4K7 resistor on Pin 4 of my Pi. (1-wire of course) BCM2835-1.56 is the current lib and installed Node-Red Version is V0.18.7 I’ll try out and let you know. For the time being thanks for yo…

I added a DHT22 sensor and even if I put no timestamp to all my DS18B20 the PI hangs. Actually all the DS18B20 are inactive it hangs.

[image] leafboy: All my DS18B20 sensors are on one 4K7 resistor on Pin 4 of my Pi. (1-wire of course) Wow, 10 x DS18B20 on a 4.7k operating at 3.3v? Do they work? 4.7k is too high even for one device when you do the sums. Better to go with 1.5k but even then I would have thought that more …

yes - they work perfectly. I never found any docs who limited the number of sensors. Of course I did not verify the displayed value but it seems quite ok.

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Node-red freezes running only a few nodes

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leafboy 2 July 2018 16:43 37

I connected the sensors to 3.3V

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Node-red freezes running only a few nodes

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