- now let’s modify our sketch to add an analog input - let’s use the potentiometer from hw #4
DESCRIPTION
Arduino Overview:. - Now let’s modify our sketch to add an analog input - Let’s use the potentiometer from HW #4. Arduino Overview:. - Connect the Red wire to +5V, Black to GND, and White to A0. Arduino Overview:. - Leave the LED connected to pin 9 but it won’t blink. Arduino Overview:. - PowerPoint PPT PresentationTRANSCRIPT
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- Now let’s modify our sketch to add an analog input
- Let’s use the potentiometer from HW #4
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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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- Hold X arrow pointing down, should see - 1.0 G
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- 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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