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28 votes
Accepted

What is the difference between MQTT and Web Sockets, and when should I use them?

The question setting here is little bit misleading, because actually these protocols cannot at all be compared together. They are like TCP and IP, layers above each other. [1] Websockets is a low ...
mico's user avatar
  • 4,331
13 votes

What is the difference between MQTT and Web Sockets, and when should I use them?

They're comparable in that both allow you to have full-duplex communication such that the server can immediately pass data to the client, without the client polling for it (as might be with HTTP). ...
TheMagicCow's user avatar
6 votes
Accepted

What does the Lively Medical Alert Watch Monitor?

What does it actually monitor? From the company's web site: Lively pillbox activity sensors monitor daily medication activity and create an alert whenever anything is missed They also ...
Mawg's user avatar
  • 3,110
5 votes

Are there any 'minimal' power meter data loggers?

There is the Sonoff Pow WiFi Switch With Power Consumption Measurement or the SONOFF S31 - COMPACT DESIGN SMART PLUG WITH ENERGY MONITORING that seems to be popular with the DIY community. You can ...
FoxSam12's user avatar
  • 370
5 votes

IoT framework / dashboard with time lapsing capabilities and reusable device definitions?

I've done something similar with my pool. I have a Temp/Ph/ORP sensor package that sits by the pool with its sensors in the water. I send the data over WiFi and MQTT to a Node.JS/Express program ...
JD Allen's user avatar
  • 618
4 votes

DS18B20 Oscillating Rapidly

Re the previous answer: the DS18B20 is a digital sensor - it takes the reading locally, stores it locally and though a separate read process digitally transmits the result (usually 12bit resolution) ...
BrendanMcL's user avatar
4 votes

DS18B20 Oscillating Rapidly

Keep in mind that the value returned from the DS18B20 is depending on the voltage received. If this voltage has fluctuations, then your readings are going to flux as well. I've seen mine go from 20C ...
JD Allen's user avatar
  • 618
4 votes

Are there any 'minimal' power meter data loggers?

If you already have a digital meter inline (or can fit a cheap 2nd hand one), then you can optically monitor the 1000 impulse/kwH LED which is likely present (without needing to interface to the ...
Sean Houlihane's user avatar
4 votes

How can I aggregate QS data from different sources on one and unique dashboard?

It probably won't come as a surprise to you, but it doesn't seem like there are any pre-existing solutions which can link your devices together. However, since you said you were interested in custom-...
Aurora0001's user avatar
  • 18.5k
4 votes

How can I monitor, from the cloud (thingspeak e.g.), something not happening?

Firstly, a simple way to monitor these types of conditions is to monitor how long ago the last task was complete. Instead of knowing when the next script is supposed to be completed, if we know if ...
Chris Schaller's user avatar
3 votes

Monitoring tools for IoT systems

I can only speak to AWS' IoT platform. It is certainly reliable and provides a lot of functionality. However there is a significant learning curve, especially if the user has never worked with AWS ...
burtawicz's user avatar
2 votes
Accepted

node-red - Metrics display with pm2?

You have edited the wrong settings.js file. The version in the node_modules/node-red directory is the template that gets copied to the User directory when Node-RED is started for the very first time. ...
hardillb's user avatar
  • 12.6k
1 vote

Sensor suggestions for accurate drone speed testing

Here's an alternative solution to what you're shown. Create a way of having a bright point light from the drone. Have a way where you take two pictures that captures this point of light from the drone....
kalyanswaroop's user avatar
1 vote

How to monitor old machines?

Brief your question little bit, if you want to measure water flow you need to learn working principle of solenoid valve and sensor unit if you are measuring water level or something, then you have to ...
Arockia Jegan's user avatar
1 vote

How to monitor old machines?

I need to have more detail from your question. But, I think you can easily use an Arduino or Mbed to monitor the water meters and communicate back to a server on your LAN. If the sensors will have ...
Matthew Trotter's user avatar
1 vote
Accepted

Handle real time rule based events generated by IoT devices

This is typically called a rule-engine where you define rules, and actions to be taken when a rule is met/breached. And this is a common requirement and not specific to IoT. There is no specific ...
Subbu's user avatar
  • 441

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