Internet of Things Stack Exchange
Internet of Things Stack Exchange

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1500 questions
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How to build a 220v ~40 amp WIFI switch (for pool pump or similar)

I'm looking for ideas and suggestions to build a 220v ~ 40 amp wifi switch for controlling my pool pump so that it can replace my mechanical timer. Very few devices are available on the market. There are both relatively expensive and according to…
Alex B
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Connecting from a PZEM004T via a USB-TTL to a computer

I am trying to connect a PZEM004T (without display) to a USB port on my PC via a USB-TTL adapter board. My intention is to send requests to the PZEM via the Adapter board. I had attempted by connecting the RX-TX cables in both ways (cross: RX to TX…
Venkata Rahul S
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Make Alexa, Sonos, or some other speaker to speak, when an email is received

I would like to have some kind of audible warning when an email arrives to my Gmail inbox (besides the sound of my phone). Is there any way to make Alexa (or maybe some other speaker) to speak when this trigger happens? It doesn't even have to say…
Enrique Moreno Tent
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Smart Plug that turns off when restarted?

I am designing a simple control circuit. I am turning on a motor using smart plug. I am looking for a smart plug that shouldn't turn on automatically when power is cut off to it. Means it should turn on when I turn on the smart plug, and should stay…
Sharoon Patrick
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Bluetooth Direction Finding - do I understand it correctly?

I just read Bluetooth Direction Finding, added to the Bluetooth spec as part of Bluetooth 5.1 to allow devices to measure angle of arrival and angle of departure (AoA and AoD) to position devices to an accuracy of under one metre (around 3.3…
Mawg
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How to divide a number in an IFTTT action

I have got Monzo (a bank) and Strava (a fitness tracking app) setup in IFTTT. There is a pre-existing recipe that saves 1 pence per 10 kilometers when a new activity is created. I want to create a similar recipe that gives me less money (I basically…
Roaders
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What are the conceptual differences and similarities between OpenHAB, Home Assistant and Node RED?

I have at home some ready-made sensors I bought and more custom ones will come, therefore I would like to collect all their data and to set rules/actions based on them. I looked into the various alternatives but, after discovering Node RED, it's not…
FarO
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Is the LinkIt 7688 Unofficially Unsupported?

I'm working on a device powered by the LinkIt Smart 7688 at the moment, and having some driver issues with building a new OpenWRT image from scratch for it. One of those issues is that the WiFi driver blobs don't seem to have been updated for some…
lochok
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Configure LightwaveRF smart dimmer

I have installed a one-gang LightwaveRF smart dimmer to an overhead light that contains 5 dimmable LED bulbs. Having gone through automatic calibration, the light turns on and off fine at full power. However, when incrementing the brightness from…
Obsidian Phoenix
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How to extract values of multiple topics in onMessageArrived(message) function of Paho MQTT JavaScript API?

I have created a Publisher Script using Paho MQTT JavaScript API which publishes values to two topics MyHome/Temp and MyHome/Hum. The script is running successfully and publishing data to CloudMQTT broker. In my Subscriber script I have subscribed…
tim3in
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IoT Standards for data format when uploading to clouds or servers

What are some IoT Standards that provide a format or framework for representing data to be sent to cloud? The problem often faced is: one tends to have information from sensor nodes and edge nodes but the data pushed to cloud often times lacks…
Shan-Desai
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How can I use Raspberry Pi to communicate with my Z-Wave gateway?

I am quite new to Z-Wave. I have a gateway, 2 z-wave sockets and 3 light switches. Everything comes from Keemple brand if that helps. However, using Keemple I cannot automate things the way I would want. I am a programmer so writing scripts in any…
Michal B.
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Add delays to Google Home routines

I have a new Google Home Mini and I'm looking to add a lot of customization to it and the devices connected to it. The built in "routines" seems quite limited, the main thing I want to do is add delays into the routines but this is not a built-in…
Jeff
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Devices suited for Industrial IoT

I was wondering which devices are used in IIoT applications. Are devices like ESP8266, ESP32, etc. (or other used in makers world) reliable for use on industrial/critical environments? If other parts of the system (power supply, etc.) are designed…
falco
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How to add resistor between two connections on breadboard

I am trying to replicate a circuit-diagram for my Raspberry Pi and DHT temperature & humidity sensor. I noticed that the author of the tutorial added a resistor between two connections (see orange and purple on the left side). Unfortunately I have…
Mike Nedelko
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