Hi,
I am a complete novice but been asked to see if it is passable to create a system that will alarm if a certain amount of weight/pressure as been exceeded.
there is to be two separate sensors. To be honest I have no idea where to start with this task.
Any help would be greatly welcomed.
Roy
For a start give a clue as to the ball park of the load that needs to be assessed. A few grams vs a few tons would give pretty different solutions in terms of the sensors.
Meantime look at this.
Why? IS the load wide and needs two supports? Or two readings one after the other to check on each other?
Hi there, so I would need to monitor two separate sensors simultaneously, alarming when over 500gms. Hope that is helpful.
Roy
Hello rfinch23
Keep it simple and stupid.
Run some tutorials to the hardware selected.
If you are happy with the results of the tutorials you can merge these to the project by using control structures.
Have a nice day and enjoy coding in C++.
Дайте миру шанс!
That one I linked says it's good for 100g (not gms 
) to 10kg, and there's a link to get started:
In that link there's code to read it- it would just need an "if()" statement to check if it's over your threshold and then turn on a led or buzzer. It does say there that there's a bit of guesswork in reading their graph and converting the reading to mass, but if you have a mass equal to the threshold mass you could take a reading with that mass and use that as the threshold reading.
You probably need to start with some of the examples here.
I'm really curious to know how you got lumbered with this task?
Wife...!!!
Start with planning out what you need to do in plain language eg
Weigh item 1
Weigh item 2
Add weight item 1 and weight item 2
Compare against target weight
If W1+W2 >= TW do x
Etc
Then work out the parameters of each
So how much weight
What load sensor you need to do that
Online tutorial for said sensor
What arduino you will use
How will you power it
Get a breadboard
Wire it up as per online tutorial
Copy and understand the tutorials code
Test
Do same for sensor 2
Then look at how you compare two variables in code like example above
You can then create an output function which could be eg “turn on led” or “buzzer”
Ugggg I hate it when that happens
I think the question to how much weight is pretty simple.
What is the pressure that will be applied to the surface (usually in g/cm2(or pound/in2)) and how much travel (depth)?
If you allow travel, a simple way would be to use springs together with a potentiometer. The meter will travel as the weight/load increases (compressing the spring) and when it is over 500 grams it will activate the switch. Or, you can measure the amount of travel with a potentiometer.
If you don't allow travel, then the simplest solution might involve a strong (and slightly bent) piece of metal flexing under the weight. another piece of metal can then be hooked up to it to detect conductance.
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