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by 1wire
Tue May 28, 2019 1:44 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 2 RX/TX accesoires
Replies: 3
Views: 346

Re: 2 RX/TX accesoires

I have a similar question, so I am going to post it into this thread. One UART of my Pi Zero (or Raspi3B, no matter) is already occupied by a power metering device. Now I want to install an additional communication with a peripheral (Arduino Nano, or ESP8266), which has to be isolated by an optocoup...
by 1wire
Thu Mar 21, 2019 10:53 am
Forum: Other programming languages
Topic: Reset 1-wire Bus - DS18B20
Replies: 18
Views: 11280

Re: Reset 1-wire Bus - DS18B20

It seems I got a bit further. With one Raspberry Zero W ("machine 2", above), I had observed that sometimes one particular sensor, and sometimes the entire bus, disappeared from the system. The workaround described in this thread did well every time! As mentioned earlier, each of the errors (except ...
by 1wire
Mon Feb 11, 2019 12:51 pm
Forum: Other programming languages
Topic: Reset 1-wire Bus - DS18B20
Replies: 18
Views: 11280

Re: Reset 1-wire Bus - DS18B20

An update, which primarily refers to the "reset" topic. - Machine 1 (a Raspberry Pi 3B) runs the built-in 1-wire protocol and bus master with 3 sensors (DS18B20, star-topology with 3 x 5 meters unshielded three-wire cable). As described above, the +3.3V supply for the sensors is provided by a GPIO o...
by 1wire
Tue Dec 04, 2018 1:14 pm
Forum: Other programming languages
Topic: Reset 1-wire Bus - DS18B20
Replies: 18
Views: 11280

Re: Reset 1-wire Bus - DS18B20

Dear folks, my recent posting is two months ago. Meanwhile, I have not understood much more about the problem., which I regret. Yet, I have two machines running which now rely on this workaround described above. Either machine had one event so far (within the last 6-8 weeks) with temperature measure...
by 1wire
Wed Oct 03, 2018 9:06 am
Forum: Other programming languages
Topic: Reset 1-wire Bus - DS18B20
Replies: 18
Views: 11280

Re: Reset 1-wire Bus - DS18B20

So instead, I am now using a GPIO pin (3.3V) as the source of power for the four sensors. When my application detects the sensors have vanished I switch OFF the GPIO pin to power down the sensors for 20 seconds and then switch the GPIO pin back on. The sensors re-appear. I am having the same proble...

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