Colorado Space Grant Consortium

Gateway To SpaceASEN 1400 / ASTR 2500

Class #13

T-53

- Announcements

- Next Time

- One Minute Report Questions

- Arduino Part 3: Sensors and SD Cards

Today:

- Everyone bring HW #4 and #5 hardware?- USB cables?- Arduino Unos?- Laptop?

Announcements:

- Review Syllabus changes…- Considering special session for finishing Arduino- See how today goes

Announcements:

- Where is the Arduino Cheat Sheet?- Do we just program to keep the sensors on the entire flight?- Do you know any good websites with Arduino tutorials?- Can we go over what the code means? int, map, etc?- How many commands are there?- What programming languages does the Arduino

understand?- Would we be able to hook a speaker to the Uno so it plays a

beep every second?- What sort of boards do other satellites have?- How is a potentiometer be relevant to our mission?

One Minute Reports:

- How do we store data to look at later?- Why are we using 2 Arduinos for our BalloonSat?- Is there a limit to the amount code we can put on the Uno?- Examples of Arduino Code?- What things define our grades and how are they weighted?

One Minute Reports:

Next Time…Rocket History

Colorado Space Grant Consortium

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- Now let’s modify our sketch to add an analog input

- Let’s use the potentiometer from HW #4

Arduino Overview:

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- Connect the Red wire to +5V, Black to GND, and White to A0

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- Leave the LED connected to pin 9 but it won’t blink

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- Potentiometer is acting like an analog sensor

- We can now hook up any analog sensor and see its value (at least through serial)

- What other sensors can we hook up?

- Let’s add some…

- But first let’s add the Protoshield

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- Take out the Protoshield your team built in HW#4

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- Carefully connect it with your unpowered Uno

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- Carefully connect it with your unpowered Uno

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- Carefully connect it with your unpowered Uno

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- Carefully connect it with your unpowered Uno

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- Reconnect Uno to laptop and verify all is working

- Activate Serial Monitor

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- Disconnect LED Breadboard and connect wire from pin 9 to JC3 on ProtoShield

- Activate Serial Monitor

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- Carefully move wire to JC3 to JC2…

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- Add the Temperature Sensor to the Breadboard

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- Connect Pin 1 to 5V

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- Connect Pin 3 to GND

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- Connect Pin 2 to A5

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- Modify your sketch to add the following variable

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- Modify your sketch to add the following lines in loop

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- Compile and Upload

- Activate Serial Monitor

- Test by putting your finger on the sensor

- Do you see a change?

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- Convert to Voltage and display on Serial Monitor

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- Should see this…

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- Use spec sheet to convert to degrees C

- 10 mV/C

- Look for offset

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- 0.5 V offset

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- Modify your sketch

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- Should see this…

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- Data make sense?

- How would you calibrate this sensor?

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- Add the Humidity Sensor to the Breadboard

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- Connect 5 V from Temp Sensor

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- Connect GND from Temp Sensor

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- Connect Out to A4

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- Modify Sketch

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- Should get…

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- Convert to voltage and understandable units from data sheet

- Algebra

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- Modify Sketch

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- Should get…

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- Data make sense?

- How would you calibrate this sensor?

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- Add the Accelerometer to the Breadboard

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- Connect 3.3V to Vcc from UNO

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- Connect GND to GND from Humidity Sensor

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- Connect ZOUT to A3 on UNO

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- Connect YOUT to A2 on UNO

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- Connect XOUT to A1 on UNO

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- Accelerometer has a few other settings we need address from the Data Sheet

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- Sleep…Connect 3.3V from Accel Vcc to SLP

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- Range…Connect 3.3V from Accel Vcc to GSEL

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- Modify Sketch as follows

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- Modify Sketch as follows

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- Should get…

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- Convert to voltage and understandable units from data sheet

- Algebra

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- Convert to Voltage = accelX * (5.0/1024)

- Subtract offset and convert to GsGs = (voltage – 1.65) / (0.206)

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- Modify Sketch as follows

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- Modify Sketch as follows

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- Should get…

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- Hold X flat, should see 0 G

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- Hold X arrow pointing up, should see 1.0 G

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Arduino Overview:

- Hold X arrow pointing down, should see - 1.0 G

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Arduino Overview:

- Repeat with Y and Z axes

- May need to tape breadboard down

- Do you need to Calibrate?

- How would you do it?

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- Add the Pressure Sensor to the Breadboard- Notice orientation

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- Add the Pressure Sensor to the Breadboard- Notice orientation

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- Connect Pin 2 to 5.0 Volts from your Humidity Sensor

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- Connect Pin 4 to GND from your Humidity Sensor

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- Connect Pin 3 to A0 on your UNO

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- Modify your sketch…

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- Modify your sketch…

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- Compile and upload. Should see…

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- Use ¼ sprinkler tubing to suck on pressure sensor

- Do not blow as limit of this sensor is 15 psi

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- Convert to voltagepV=A0*(5.0/1024)

- Use spec sheet to solve for psi (Algebra)

Pmax = 15 psiPmin = 0Vsupply = 5.0 VOutput(V) = pV

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- Solve for Pressure(applied) = Pa

Pa = psi = (pV – (.1 * 5.0)) / (.8*5.0) / (15-0) psi = (pV – .5) / (.4 / 15)

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- Modify your sketch…

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- Modify your sketch…Suggest commenting out your accel and other sensor Serial.print statements

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- Should see this…

- Suck to zero?

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