Tagged Questions
4
votes
4answers
153 views
devices for measuring tension or detecting “slackness” in fishing wire
How might I go about measuring the tension in a line of fishing wire? I'm mostly interested in determining when the line is in tension vs when it's slack.
The application is a boat-mounted ...
3
votes
3answers
479 views
Detecting dry-running of water pump
What are some reasonably reliable ways of detecting that a water pump (electrical motor based) is "dry running", i.e. no water is passing through the pump either because there is no water available at ...
4
votes
3answers
437 views
Water level detection, where water is somewhat polluted and has significant dissolved salts
Found this excellent QnA here which provides several options for measuring or detection water-level. For my case, it is enough to differentiate 4 levels of water (very low, low, middle, full), of the ...
0
votes
0answers
56 views
measuring vertical movement in a container
I am looking for a non-mechanical means to measure the descension of a plate within a container about 3cm by 15cm by 7cm. The plate is not terribly well guided so there is a need for a lot of room for ...
1
vote
3answers
2k views
Measure weights with arduino
I want to measure weights with arduino. After the measurements, i want to analyze the weight data of the measured objects.Precision is not very important, but it should be work in the range of 10 to ...
2
votes
1answer
155 views
Is it possible to build something that can measure water and oil in a tank with out being in the tank?
Say you have water and oil in tank....Is there any thing out there that can tell me how much water is in the tank and how much oil is in the tank???
2
votes
1answer
296 views
Sensors to detect and measure movement
I would like to know which sensors should I use in order to get measurement of a movement of my device (slow speed movement on a 2D plane, in cm or mm if possible). The goal is to find out if the user ...
1
vote
2answers
604 views
How to measure EC, pH, 10k thermistor, DO, and Ion-selective probes
Here are the sensors I am trying to measure and then convert into a 0-5V analog output:
pH (acid or base): my understanding is you can use DC voltage to measure this sensor, just not sure what kind ...
4
votes
7answers
2k views
Vibration sensor (accelerometer?)
For growing crystals it is important that there are no vibrations. Is there a cheap and easy way to measure vibrations in the floor, like people walking, doors closing etc.?
Perhaps an accelerometer ...
18
votes
13answers
3k views
Level of a water tank with a microcontroller
How do i measure the level of a water tank with a microcontroller?
