So, I'm here to talk about the Go Direct Gas Pressure. This is a great pressure
sensor that is incredibly useful for lots of biology experiments.
The experiment that I want to show you today though, is how to use this sensor
to look at grip strength just using a Gas Pressure Bulb
and one of the accessories, this tube and the stem, that comes with
the Go Direct Gas Pressure sensor. Now, one of the things that's great about the
Go Direct Gas Pressure sensor is it's Go Direct. That means it can be used with a
USB cable or it can be used wirelessly. I really like the wireless feature because
that means a student can be looking at their grip strength
while someone else is watching on their device. So, what I'm going to do is I'm
just going to show you how to connect the stem and the tube to the pressure bulb
and to the Go Direct pressure sensor, and then we'll collect some data.
So, I first have to determine which side of the stem goes into which hole of the
bulb here. If I press on it, I can feel the air coming out.
I need to put the stem into that hole there until it's tight. And now,
I can feel air coming out of the end of the tube . And now, I'm just going
to connect it to the gas pressure sensor here, the Go Direct Gas Pressure Sensor.
And now, I'm all ready to just collect grip strength data when I press
on the bulb. Now, I've already launched the graphical analysis for our software.
But, I need to show you how to connect the sensor. If you look real closely here,
there's a little red blinking light. That means that the sensor is not
connected to the software yet. If I go into the software and I select
New Experiment, if I go to Sensor Data Collection, I should be able to see the
gas pressure sensor here. Now, it has an order code of GDX-GP.
So, I can scroll down until I see it. And there it is. Go Direct Gas
Pressure Sensor. So, I'm going to select on that sensor,
and now I'm ready to collect data. But, let's go back and look at the sensor
for a minute. I should now be able to see a little green blinking light.
That means it's actually connected to the software. Now, to collect hand grip data,
I need to collect a little bit faster than you normally would with the gas
pressure sensor. So, I'm going to select Done,
and then I'm going to change my data collection settings.
So, I'm going to go over here and I am just going to select data at around 10
samples a second, and I'm only going to collect data for 20 seconds,
not 900 seconds. Actually, I could even just collect for 10.
Then, I'm going to hit Done. And now, I'm just going to collect some grip
strength data with my left hand, and then with my right hand.
So, I'm going to hit Collect, then I'm going to squeeze on the bulb,
and let go. So, there's the amount of pressure, which correlates to grip
strength that I was able to produce with my left hand. And now,
I can collect another run with my right hand. So, I'm going to hit the
Collect button, squeeze with my right hand, and now I could even show both runs
at the same time. All I need to do is select here on the Y-axis for pressure,
and I can show both data sets. The blue one was my left hand,
the yellow one was my right hand. This is a great activity to introduce your
students to data collection. If you have any questions
about this sensor, the Go Direct Gas Pressure, visit our website.