29
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 ...
- 4,301
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).
...
- 596
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 ...
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 ...
- 360
4
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 ...
- 608
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) ...
- 109
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 ...
- 608
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 ...
- 10.3k
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-...
- 18.1k
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 ...
- 221
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 ...
- 31
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.
...
- 12.4k
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....
- 973
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 ...
- 166
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 ...
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 ...
- 431
Only top scored, non community-wiki answers of a minimum length are eligible