Hi folks,
I am working on a project where I have 4 sensors. What I need to do is, when one of the 4 sensors is activated (Force), it will output a voltage above 0.50v but below 5.0v. I then need that same voltage to be outputted from one of the pins, and I will feed it into a linear amplifier, and then back to the Arduino.
Can somebody tell me if this is possible? Can anybody give me a hint on how? I have almost no experience with programming. Please help.
Much thanks in advance....
Simple Arduinos do not have a D/A converter.
depending on the precision you need and the speed how fast the voltage must change you can create a PWM-signal that is feeded into an RC-filter to transform the PWM-signal into an analog voltage.
There will be some "ripple" on this voltage
The "ripple" becomes smaller with a higher capacity of the capacitor. Increasing the capacitor decreaes reaction-speed when the voltage-level changes.
But maybe there can be found a different solution.
Can you pleae decribe what you want to do in the end?
What is the final purpose of your device?
best regards Stefan
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I have 4 force sensing resistors, and I need to use them together with just one amplifier. I cant afford to buy 3 more amplifiers. So I can connect them in parallel and then to the amplifier input, but then they would affect each other.
I need(want) to use the Arduino like a selector switch instead, so that only when the sensor is pressed (and it's resistance is lowered/voltage is increased: SEE PARAGRAPH BELOW), that sensor will 'activate'. Come to think of it, I don't think it's possible.
Each sensor is idle at 490mv - 500mv. Once activated, it registers between 0.5v and 5.0v. Those are the criteria the code would have to look for. When one of the inputs reads above 0.5v, it's signal/voltage needs to be transmitted to an analogue pin, as is, unaffected.
So,
4 Sensors (Analogue) -> ARDUINO -> 1 Output (Analogue)
again:
depending on the precisision you need different solutions are posible.
But as long as you don't specify what the needed precision is the suggestions are some how guessings in the fog.
Even better would be to post an overview about your whole project. I'm pretty sure that there are different ways to achive what you want to do in the end.
For example a lot of different load-cells can be used with a HX711 board to amplifiy the signal
here is a german distributor for a load-cell two plates and the amplifierboard all in all 6€ = 7$
https://www.reichelt.de/entwicklerboards-a-d-wandler-waage-10-kg-debo-hx711-10-p316339.html
The HX711 board starts at 3€
https://www.ebay.de/itm/115263698940
To stay with your sensors. Post a datasheet of the sensors.
The other way is to answer a lot of very specific questions:
do those sensors already have its own power-supply that is outputting the 0,5V in idle-state?
There are analog multiplexers like the CD 4067 1,20€
MOS 4051 0,50€
https://www.reichelt.de/analoger-multiplex-demultiplex-8-kanal-3--15-v-dip-16-mos-4051-p12610.html
If the sensors output is weak you could use a quad-OP-Amp all 4 OpAmps as voltage-followers
which requires zero additional parts 0,26€
https://www.reichelt.de/operationsverstaerker-4-fach-dip-14-lm-324-dil-p10463.html
To create the exact same voltage but for higher loads.
If you can specifiy how much money is inside your budget better sugestions can be made
Be the change you want to see in the world
best regards Stefan
TLV2375
For a suggestion from users with a lot of OpAmp-exprience post a link to your question here in the general electronics forum. Just a link to avoid cross-posting
@d1450
This looks a lot like your other topic 74HC4051 MUX: Enable More Than 1 Channels Slightly different question but still 4 inputs to one. Please explain how these are different topics. You are not allowed multiple topics on the same subject because it wastes the time of the people trying to help.
Thank you.
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