# Hardware

**URL:** https://discourse.nodered.org/c/hardware/16.md?page=14

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**Page:** 15

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## [Serial In Node - TXD Serial, 5V TTL Level into Pi 3b](https://discourse.nodered.org/t/serial-in-node-txd-serial-5v-ttl-level-into-pi-3b/22129)

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**Author:** [@beginnergeorge](https://discourse.nodered.org/u/beginnergeorge)\
**Replies:** 0\
**Last updated:** [23 February 2020 10:52 UTC](https://discourse.nodered.org/t/serial-in-node-txd-serial-5v-ttl-level-into-pi-3b/22129 "2020-02-23T10:52:43Z")

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Hi everyone, thanks for looking and any help available. I'm a newbie so apologies for any errors I make. BTW LOVING node-red, unfortunately it has sparked a flurry of potential "projects"... I'm trying to read data from…

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## [RPi zero w with LM393 / "flying fish" sensor](https://discourse.nodered.org/t/rpi-zero-w-with-lm393-flying-fish-sensor/22007)

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**Author:** [@GeorgeX](https://discourse.nodered.org/u/GeorgeX)\
**Replies:** 18\
**Last updated:** [22 February 2020 18:04 UTC](https://discourse.nodered.org/t/rpi-zero-w-with-lm393-flying-fish-sensor/22007 "2020-02-22T18:04:06Z")

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Hi ! I use a raspberry pi zero w, node-red, mosquito......as smart home system. Connected per wire are some DS18B20 temperature sensors, a sonic sensor in a well, normally closed switch in sewage pipe, some wireless ESP…

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## [I2c on OrangePi Zero](https://discourse.nodered.org/t/i2c-on-orangepi-zero/21777)

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**Author:** [@dzairo](https://discourse.nodered.org/u/dzairo)\
**Replies:** 8\
**Last updated:** [17 February 2020 10:37 UTC](https://discourse.nodered.org/t/i2c-on-orangepi-zero/21777 "2020-02-17T10:37:38Z")

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Hi all. I'm new . On my OrangePi Zero install OLED LCD. if list all device on my i2c bus show this : i2cdetect -y 0 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- --…

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## [Micro ups and safe shutdown](https://discourse.nodered.org/t/micro-ups-and-safe-shutdown/6212)

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**Author:** [@karlbo](https://discourse.nodered.org/u/karlbo)\
**Replies:** 5\
**Last updated:** [15 February 2020 13:11 UTC](https://discourse.nodered.org/t/micro-ups-and-safe-shutdown/6212 "2020-02-15T13:11:01Z")

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Hi there, anyone else having suffered corrupted filesystem due to powerfailure? the last year i have developed lots of automation in varius fields around in Norway, using Node-Red. some of the systems have suffered catas…

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## [Request seems blocked in docker container (ETIMEDOUT)](https://discourse.nodered.org/t/request-seems-blocked-in-docker-container-etimedout/20987)

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**Author:** [@pandos](https://discourse.nodered.org/u/pandos)\
**Replies:** 0\
**Last updated:** [29 January 2020 08:55 UTC](https://discourse.nodered.org/t/request-seems-blocked-in-docker-container-etimedout/20987 "2020-01-29T08:55:39Z")

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I have run into a strange case when trying to make a HTTP request from my Node-Red running on docker. I have a SolidRun hardware (similar ro a Rasberry Pi) with Debian Buster. I have one instance of Node-.Red running o…

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## [DHT22 freeze for no reason](https://discourse.nodered.org/t/dht22-freeze-for-no-reason/20174)

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**Author:** [@pyromana](https://discourse.nodered.org/u/pyromana)\
**Replies:** 48\
**Last updated:** [26 January 2020 10:58 UTC](https://discourse.nodered.org/t/dht22-freeze-for-no-reason/20174 "2020-01-26T10:58:13Z")

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Platform: pi 3 model B+ OS: Rasbian Node-RED: 1.0.3 Node.js: v12.14.0 problem node: node-red-contrib-dht-sensor v1.0.4 node-dht-sensor: 0.4.0 bcm2385 libs 1.60 Hi everybody, I'm using a raspberry with node-red to…

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## [Raspberry pi4 memory question](https://discourse.nodered.org/t/raspberry-pi4-memory-question/20722)

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**Author:** [@Dave](https://discourse.nodered.org/u/Dave)\
**Replies:** 5\
**Last updated:** [22 January 2020 22:13 UTC](https://discourse.nodered.org/t/raspberry-pi4-memory-question/20722 "2020-01-22T22:13:25Z")

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I have a raspberry pi 4 2gb running buster and node-red 1.0.3 node -v8.11.3 I know there is a cmd node-red-pi --max-old-space-size=256 to tell the underlying Node.js process to free up unused memory sooner than it woul…

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## [RGBW Led Control (esphome)](https://discourse.nodered.org/t/rgbw-led-control-esphome/20735)

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**Author:** [@necton](https://discourse.nodered.org/u/necton)\
**Replies:** 0\
**Last updated:** [22 January 2020 17:49 UTC](https://discourse.nodered.org/t/rgbw-led-control-esphome/20735 "2020-01-22T17:49:54Z")

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Greetings, guru! I could not solve the problem of controlling the RGBW LED strip from Node-Red. Hardware: - controller "MagicHome" (Philips Hue) flashed from ESPHOME. (Method GPIO\>transistors) The LED stripe is perfect…

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## [Rancher 1.6 Healthy](https://discourse.nodered.org/t/rancher-1-6-healthy/20302)

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**Author:** [@markgr](https://discourse.nodered.org/u/markgr)\
**Replies:** 0\
**Last updated:** [14 January 2020 09:44 UTC](https://discourse.nodered.org/t/rancher-1-6-healthy/20302 "2020-01-14T09:44:44Z")

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Hi just wondering if anyone has any tips on getting nodered to run on rancher 1.6.... I can get the container up but can't seem to get rancher to detect it's healthy :frowning: cheers

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## [Mqtt broker and Sonoff Tasmota](https://discourse.nodered.org/t/mqtt-broker-and-sonoff-tasmota/19794)

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**Author:** [@FarfarGoHai](https://discourse.nodered.org/u/FarfarGoHai)\
**Replies:** 4\
**Last updated:** [2 January 2020 19:09 UTC](https://discourse.nodered.org/t/mqtt-broker-and-sonoff-tasmota/19794 "2020-01-02T19:09:29Z")

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Ok, so I have made this flow that based on various inputs sends an on/off signal that I would like to use for turning on/off a ventilation system. I have flashed a Sonoff with tasmota, and through the sonoffs own web in…

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## [Automations from Wyze Sense triggers?](https://discourse.nodered.org/t/automations-from-wyze-sense-triggers/19801)

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**Author:** [@OctavioMasomenos](https://discourse.nodered.org/u/OctavioMasomenos)\
**Replies:** 2\
**Last updated:** [1 January 2020 21:26 UTC](https://discourse.nodered.org/t/automations-from-wyze-sense-triggers/19801 "2020-01-01T21:26:22Z")

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I’m told that automations are possible in Node-RED using triggers from Wyze Sense devices but searching the forum, I don’t find any mention of Wyze Sense. Could someone please point me in the right direction?

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## [PWM frequency on BeagleBone](https://discourse.nodered.org/t/pwm-frequency-on-beaglebone/19689)

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**Author:** [@badfrogg](https://discourse.nodered.org/u/badfrogg)\
**Replies:** 5\
**Last updated:** [29 December 2019 17:59 UTC](https://discourse.nodered.org/t/pwm-frequency-on-beaglebone/19689 "2019-12-29T17:59:26Z")

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Is there a method to control the PWM frequency form node-red running on BeagleBone Black? The Raspberry PI nodes have this but the BBB seems to have poor support for features like this. It suck because the BBB has a nice…

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## [Is there a library to allow connection of HID from remote browser?](https://discourse.nodered.org/t/is-there-a-library-to-allow-connection-of-hid-from-remote-browser/19662)

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**Author:** [@t-l-ray](https://discourse.nodered.org/u/t-l-ray)\
**Replies:** 0\
**Last updated:** [27 December 2019 19:58 UTC](https://discourse.nodered.org/t/is-there-a-library-to-allow-connection-of-hid-from-remote-browser/19662 "2019-12-27T19:58:49Z")

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I'm guessing this probably doesn't exist but maybe? I'm wondering if there is a browser/node-red lib combo that I can combine to allow a server to talk to a HID device connected to a client PC. Chrome WebHID seems like t…

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## [Open zwave Cannot open serial port /dev/ttyUSB0](https://discourse.nodered.org/t/open-zwave-cannot-open-serial-port-dev-ttyusb0/18994)

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**Author:** [@juntiedt](https://discourse.nodered.org/u/juntiedt)\
**Replies:** 14\
**Last updated:** [12 December 2019 09:43 UTC](https://discourse.nodered.org/t/open-zwave-cannot-open-serial-port-dev-ttyusb0/18994 "2019-12-12T09:43:40Z")

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I am trying to install openzwave on a raspberry B3 with a new buster installation. So far all went ok until I started the test program MinOZW which gives me the following message ERROR: Cannot open serial port /dev/ttyU…

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## [Yeelight Problem](https://discourse.nodered.org/t/yeelight-problem/18371)

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**Author:** [@Badger](https://discourse.nodered.org/u/Badger)\
**Replies:** 3\
**Last updated:** [28 November 2019 08:10 UTC](https://discourse.nodered.org/t/yeelight-problem/18371 "2019-11-28T08:10:04Z")

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I hope someone out there can help me. I am a novice at this stuff. I have Yeelights running on my pi and using node red. I don not use them all the time so I disable the 2 flows that can control them. My pi filled up …

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## [Is anyone else using an MCP3008 with Buster?](https://discourse.nodered.org/t/is-anyone-else-using-an-mcp3008-with-buster/18261)

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**Author:** [@kocherjj](https://discourse.nodered.org/u/kocherjj)\
**Replies:** 5\
**Last updated:** [27 November 2019 05:18 UTC](https://discourse.nodered.org/t/is-anyone-else-using-an-mcp3008-with-buster/18261 "2019-11-27T05:18:36Z")

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I have a small breadboard project setup with a Pi 3 A+ that has been running for about a year, with an MCP3008 taking a reading from a photoresistor and driving a series of LEDs when the voltage changes more than a certa…

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## [Counterfeit DS18B20](https://discourse.nodered.org/t/counterfeit-ds18b20/18198)

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**Author:** [@ghayne](https://discourse.nodered.org/u/ghayne)\
**Replies:** 1\
**Last updated:** [20 November 2019 15:23 UTC](https://discourse.nodered.org/t/counterfeit-ds18b20/18198 "2019-11-20T15:23:14Z")

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I just found this in another forum: \[edit\] This link https://www.maximintegrated.com/en/support/faqs/ds18b20-faq.html also shows that the real DS18B20 is also a lot more accurate than we think!

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## [Read data from RS232 Scale weight port](https://discourse.nodered.org/t/read-data-from-rs232-scale-weight-port/18175)

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**Author:** [@jaquesvoleur](https://discourse.nodered.org/u/jaquesvoleur)\
**Replies:** 2\
**Last updated:** [20 November 2019 10:21 UTC](https://discourse.nodered.org/t/read-data-from-rs232-scale-weight-port/18175 "2019-11-20T10:21:28Z")

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Hi, I have been triying to read data from a digital scale weight, it uses a RS232 port, I am using my laptop with Linux Mint, I have been triying a lot of software for SCADA just for read the data but I got no luck, now …

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## [Can not get USB serial work with Node-Red](https://discourse.nodered.org/t/can-not-get-usb-serial-work-with-node-red/17964)

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**Author:** [@insanoff](https://discourse.nodered.org/u/insanoff)\
**Replies:** 7\
**Last updated:** [18 November 2019 15:23 UTC](https://discourse.nodered.org/t/can-not-get-usb-serial-work-with-node-red/17964 "2019-11-18T15:23:44Z")

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Dear All, I am a newbie and it is my first time using Node-Red. My Node-Red is running on Raspberry Pi 4. For learning purpose I am trying to read ESP32 device connected to RPi via USB. I am able to display the output i…

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## [Cannot read from Pi Zero serial port](https://discourse.nodered.org/t/cannot-read-from-pi-zero-serial-port/17905)

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**Author:** [@ghayne](https://discourse.nodered.org/u/ghayne)\
**Replies:** 2\
**Last updated:** [14 November 2019 15:28 UTC](https://discourse.nodered.org/t/cannot-read-from-pi-zero-serial-port/17905 "2019-11-14T15:28:59Z")

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I am trying to create a serial link between a Pyboard running Micropython and a Pi Zero (Old model with no WiFi) running node-red 1.02. I cannot receive any data on the pi using the serial port node (v0.9) I can send d…

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## [Node-Red Version 1.0 on BeagleBone](https://discourse.nodered.org/t/node-red-version-1-0-on-beaglebone/17633)

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**Author:** [@MJR](https://discourse.nodered.org/u/MJR)\
**Replies:** 7\
**Last updated:** [8 November 2019 12:51 UTC](https://discourse.nodered.org/t/node-red-version-1-0-on-beaglebone/17633 "2019-11-08T12:51:54Z")

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Hi there, I'm running Node-Red on a couple of BeagleBone boards (Black and Green). I have just setup a Green with the latest EMMC flasher image and decided to run the upgrade command given on the "Running on BeagleBone …

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## [Anyone tried the M5 AC Socket?](https://discourse.nodered.org/t/anyone-tried-the-m5-ac-socket/17134)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 0\
**Last updated:** [25 October 2019 12:16 UTC](https://discourse.nodered.org/t/anyone-tried-the-m5-ac-socket/17134 "2019-10-25T12:16:52Z")

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This looks potentially interesting from M5 Stack, it seems to allow for RS485 ModBUS-RTU control: For $12.50, might be cool to try out. Wondering if anyone has already tried it?

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## [Q: Bundle sensors with an ESP8266 or separate them?](https://discourse.nodered.org/t/q-bundle-sensors-with-an-esp8266-or-separate-them/16646)

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**Author:** [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Replies:** 22\
**Last updated:** [17 October 2019 19:23 UTC](https://discourse.nodered.org/t/q-bundle-sensors-with-an-esp8266-or-separate-them/16646 "2019-10-17T19:23:36Z")

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Following on from this post: https://discourse.nodered.org/t/fastest-onewire-ds18b20-update-rate-on-raspberry-pi/16520/19?u=totallyinformation I use digital BH1750 sensors internally to measure light levels. My only ex…

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## [External Lux meter via zigbee protocole](https://discourse.nodered.org/t/external-lux-meter-via-zigbee-protocole/16105)

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**Author:** [@Jean-Luc](https://discourse.nodered.org/u/Jean-Luc)\
**Replies:** 17\
**Last updated:** [17 October 2019 19:07 UTC](https://discourse.nodered.org/t/external-lux-meter-via-zigbee-protocole/16105 "2019-10-17T19:07:01Z")

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Hello, I'm looking for a zigbee light sensor to manage the amount of indoor light according to the external light power. Do you know of such a sensor? Thanks

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## [Great UPS for Raspberry Pi](https://discourse.nodered.org/t/great-ups-for-raspberry-pi/16575)

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**Author:** [@Poodlepapa](https://discourse.nodered.org/u/Poodlepapa)\
**Replies:** 17\
**Last updated:** [16 October 2019 04:26 UTC](https://discourse.nodered.org/t/great-ups-for-raspberry-pi/16575 "2019-10-16T04:26:33Z")

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I had interesting problem. I wanted to add presence detection to the far end of my driveway but didnt want to run dedicated power to the location. I had 12 volt LED lights that I had already installed but didn't want to…

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## [Node-Red on Chromebook](https://discourse.nodered.org/t/node-red-on-chromebook/16745)

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**Author:** [@dave-kinnear](https://discourse.nodered.org/u/dave-kinnear)\
**Replies:** 3\
**Last updated:** [15 October 2019 19:35 UTC](https://discourse.nodered.org/t/node-red-on-chromebook/16745 "2019-10-15T19:35:38Z")

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Has anyone found a current instruction set for running Node-Red on a Chromebook? There are a few different instructions on Reddit and around but all of them hit a snag at some point likely due to permissions or being ou…

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## [Active IR beams for perimeter protection - experiences?](https://discourse.nodered.org/t/active-ir-beams-for-perimeter-protection-experiences/16516)

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**Author:** [@BartButenaers](https://discourse.nodered.org/u/BartButenaers)\
**Replies:** 26\
**Last updated:** [11 October 2019 18:47 UTC](https://discourse.nodered.org/t/active-ir-beams-for-perimeter-protection-experiences/16516 "2019-10-11T18:47:37Z")

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Hi folks, I had planned to order some IR beams for my Christmas. Now already you might think. But when they need to arrive from Aliexpress, I need to start looking already :wink: But got very recently feedback from a…

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## [Sensing AC switches and buttons states](https://discourse.nodered.org/t/sensing-ac-switches-and-buttons-states/15960)

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**Author:** [@Vittorio](https://discourse.nodered.org/u/Vittorio)\
**Replies:** 24\
**Last updated:** [30 September 2019 12:37 UTC](https://discourse.nodered.org/t/sensing-ac-switches-and-buttons-states/15960 "2019-09-30T12:37:12Z")

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Hello everyone ! I'm in the process of building my home automation system: I have a relay shield and I'm going to control it via the GPIOs of the same Raspberry pi that runs Node Red (I'll eventually have to use some mu…

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## [Serial node not splitting on silence](https://discourse.nodered.org/t/serial-node-not-splitting-on-silence/15692)

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**Author:** [@ckelle22](https://discourse.nodered.org/u/ckelle22)\
**Replies:** 8\
**Last updated:** [23 September 2019 15:18 UTC](https://discourse.nodered.org/t/serial-node-not-splitting-on-silence/15692 "2019-09-23T15:18:24Z")

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Hey all, I am trying to use the serial node to receive messages from our NEO-M8P GPS module. The messages are UBX (hex based messages) and seem to be coming in at a condensed rate. They repeat once a second, but the spa…

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## [Aosong AM2315 temp/rh](https://discourse.nodered.org/t/aosong-am2315-temp-rh/4589)

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**Author:** [@JaSiev](https://discourse.nodered.org/u/JaSiev)\
**Replies:** 14\
**Last updated:** [6 September 2019 18:41 UTC](https://discourse.nodered.org/t/aosong-am2315-temp-rh/4589 "2019-09-06T18:41:14Z")

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Has anyone tried to collect Temp/RH data from a AM2315 sensor? I've tried the i2C in/out nodes with little success (I get a return from the sensor but it doesn't make sense). I can get data through python scripts so I …

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