arduino pressure sensor
I covered this topic about three years ago. A lot has changed in the Arduino world. I had a lot of questions too on some basic introductions to servo, so this first video is going to be a very basic introductory to how to get servos working first let’s take a look at the parts we’re using today. Two of my favorite companies for ordering Arduino and electronics parts are Adafruit and Sparkfun. I am actually using a slightly older version of the Arduino that’s shown here. This is the current uno version and in fact they have a newer one called Leonardo, but we won’t get into that today. Any of these Arduino should work. Fine. This one is about 30, the new Leonardo one, which, as more features, is actually even cheaper we’re using a standard hobby servo. A mine is slightly different than this one, but for all intents and purposes same thing these can be had from anywhere from 5 to 20. In this one here is 12 I’m. Also, you wanted to point out that I’m, using some of the Adafruit breadboard wires, that are very helpful. They have different packs based on male and female and such but would highly recommend those if you’re, a breadboard user and finally, the second part of this tutorial I’m going to be using a flexi force. Pressure sensor, which I purchased from Sparkfun we’re, going to go over. Two different tutorials today, the first one is the sweep tutorial.
Anyone who downloads the Arduino software can get that by going to examples, servo sweep we’re not going to change the code, but I do want to quickly walk through it. It includes the servo th, which is sort of a pre programmed servo library. That saves a lot of time. It is one of the main features to the Arduino hardware and software platform we’re, adding a servo which we’re calling my servo can be servo 1. Whatever you want to call it and we’re saying we’re, creating an integer, POS, short position and we’re storing that initial variable of this gyro, you don’t actually need to store an initial variable, but that’s fine and the void setup we’re doing my servo attach 9, so we’re. Attaching the servo to pin 9 I’ll show you what that means. When we take a look at the hardware and then in the standard Arduino code, which is a void loop, you say for position 0 to position 180 or actually 179 position equals position plus 1. What that means is looping through such that position equals 1, then 2, then 3 and every time into writing the servo to that position. So what it’s literally doing is every 15 milliseconds it, which is what the delay 15 means. There are 1000 milliseconds in a second it’s writing the position of 1 to the rillette cetera you’re, asking why it’s zero to 180 or actually zero to 179 it’s, because the standard hobby servo only rotates between 0 and 180 degrees.
It doesn’t make full complete, continuous rotations, but it rather does sort of half circles so and then the next one it’s the same code except you’re descending from 179 back to 0. So let’s take a look at the Arduino and hardware and then we’ll run the so. As I mentioned, I like using the jumper cables from Adafruit and here I’m using them to connect the servo wire. You can see here this loops back to the servo that’s held in the vise just for stability to either the breadboard or directly onto the Arduino. The standard hobby servo has three cables: a black red and a yellow the black, and this is I’m sure there are some rare exceptions. The black can go to ground. The red can go to the voltage positive, which in this case and for most hobby servos is 5 volts and the yellow goes to the signal. The sort of signal pin on the microcontroller is telling it what to do so. I’Ve set up this breadboard with the yellow cable jumper cable, going from 5 volts over here to this 5 volt rail on the breadboard in the orange cable from ground to the ground rail that lets me use these rails that run along the breadboard. For my positive and negative connections and as you can see, I’ve used a red, jumper, cable to hook up the positive voltage and a black one to hook up the servo motors negative voltage.
If you can see this yellow wire, it snakes through here and goes to pin 9 on the digital output pin of the Arduino, and that reference is the my servo dot attached 9 code we just looked at for now. You can ignore the other connections. I’Ve got right here: we’ll talk about those in a second, so let’s hop back over to the software upload the code and see what happens again. This was a sample code, so no changes needed we’ll just go ahead and click upload and you’ll see right here. The status it’ll say done uploading in just a second done uploading. So let’s take a look at what happened. So simple enough. You can see the servo is rotating from zero, which I would say is on the left, all the way up 208 degrees and then back to zero. So now let’s take this up a notch by interacting the servo motion with a sensor so go ahead and go to file examples. Servo knob, and that opens the code here. I’Ve made a few edits that I’ll go over I’ll notice, much of it’s the same. The first new thing we have is this int pot pin equal zero. This example actually is intended for a potentiometer we’re, going to use a different type of sensor. It looks very different, but it works the same way: it’s a resistive type of sensor or variable resistor. The first piece of code – I added – is serial D begin 9600 that’s going to let us use a serial, monitor screen on the computer to watch what’s going on with the input sensor and then what we’re going to do is we’re going to say Val equals analog.
Read dot pop pin so that pot pin is the input pin of our sensor and it’s going to do an analog, read it’s a good time to mention the difference between analog and digital as a great example, which is analog, means how much does something way if There’S a scale of possibilities or range of possibilities: digital just means yes or no, so in other words, is the cat on the couch that’s, a yes or no question that’s digital. How much does the kappa way that’s an analogue question? The a pressure sensor can obviously have a very range of pressures to that’s an analog type sensor, we’re going to code out this Val map come in just for now. I’Ll show you more about that in a second and then what this is doing is it’s. Writing the servo position to the Val and then this serial dot print line prints the value on that serial monitor so let’s talk about this flexi force pressure sensor you can see here. There are three leads coming off of it. The middle lead is actually a dummy lead. The lead on the left here uses a red jumper to connect directly to positive five volts, and the lead on the right connects to two different things. It connects to a resistor that pulls it down to ground. You can research pull down resistor if you’d like to learn more about that, and then it uses this green cable to go all the way over to the analog in port zero, which we referenced on the code earlier when we said int pot pin equals zero.
That meant an analog input on pin zero, so what’s going to happen is I’m going to squeeze this sensor and it’s going to give me a value in that range will be between zero and 123, which use me 1023. That has to do with the way that binary numbers work so it’s a range of zero all the way through 1023. An important thing when you’re taking new steps in our dwee no code is to take it step at a time. So what we’re going to do is we’re going to just focus on the pressure sensor and not worry about the servo. Yet then we’re going to use the serial monitor to monitor what the input is for that pressure pad. So I’ve got it hooked up. Okay, you’ll notice, I’ve actually disconnected my servo right now to take it out of the picture we’re going to hop back over to the code and what we’re going to do is I’m going to squeeze this pad. With my finger and we’re going to see what happens in the serial London, I forgot to mention one other change. I increase the delay to 100 milliseconds that’s, one tenth of a second just to slow down the pace at which it reads. The code you’ll see why, in a second we’re, going to go ahead. First of all, upload your code and then we’re going to go to tools serial, monitor and you’re, going to see these numbers index down if they.
If I had left that delay unchanged, I think at 15 milliseconds. These numbers would be refreshing far faster than need be, so you can see these numbers are in the let’s call it 20 estranged I’m going to go ahead and I’m going to pinch. The sensor and we’re going to see them jump up all the way to 500 and 600, even if I squeeze really hard. So what we want to do is take that input range of 0 all the way up to 1023 and make it correspond to what the servo can actually move, which is only between the number 0 and 179 and that’s. What this map function does it says: take the distance of the range of 0 to 1 to 1023 and in sort of down scale, it’s that that actually only means 0 to 179. So what we’ll do is we’ll go ahead and upload this code and then we’ll pinch, the servo and, as we pinch excuse me, we’ll pinch the sensor as we pinch it. We should get the servo to indicate and move over to that position that correlates how hard we are squeezing and there we have it. If I squeeze a little bit, the servo just moves a few degrees, and if I squeeze as hard as I can it moves over, if you remember the furthest, I got it in the serial. Monitor was about 600, and that explains why it’s, not rotating all the way over to the right, because if you think about it, 600 is only a little more than halfway to the range of 1023.
So when it ports that or maps that down to the degrees of the servo motion, you’ll see that’s, why I’m only getting over so far that wraps up today’s tutorial stay tuned.
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