Transcript 07_AVR_MODS (PPTmin) - Colorado Space Grant Consortium

Student Hands On Training I (2009)
Additional
AVR Modifications
For BalloonSat Flight
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Additional Modifications:
- There are two additional modifications we need to do
your team’s AVR board
1. Heater Circuit Integration
2. Camera Circuit Integration
Both of these modifications will allow the AVR board
to activate the heater and camera
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Student Hands On Training I (2009)
Heater Circuit
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Hands-on: Heater Circuit
- Your team will have 45 minutes to build an active
heater circuit and integrate it to your AVR board
- Instructions are in your handbook
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Student Hands On Training I (2009)
Environments
@ 30 km
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Environments at 30 km:
• How high do commercial jet fly?
• How high is the ozone layer?
~10 km
~20 to 50 km
• What are the layers of the atmosphere?
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Environments at 30 km:
• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere
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Environments at 30 km:
Capt. Joe W. Kittinger
jumps from a balloon at
102,800 feet
Forgot to
mention, he
exceeded the
speed of sound
with his body
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Environments at 30 km:
Temperature varies in all
directions as you climb
through the different
layers of the atmosphere
Why?
Solar Radiation (UV, IR)
- Ozone Absorbs
- Surface Heats
- Convection
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Environments at 30 km:
- Temperature can dip to -80°C
- Biggest killer of past missions
- Easy, repeatable science
Burst (30 km)
Landing
Launch
Coldest
Tropopause
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Environments at 30 km:
- You need to do something to keep your systems warm
- Colorado history has shown payloads (batteries) begin
to fail below -5°C
- Hand warmers don’t work well without air (O2)
- You will use an active heater
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Environments at 30 km:
• BalloonSats can do real science at 100,000 feet
• Discoveries can be made
• Atmospheric studies can be done
• Engineering challenges are extreme
• Enough unknowns to catch the mind of students
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Hands-on: Heater Circuit
- Dry ice test results have been excellent
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Hands-on: Heater Circuit
Kit includes:
3
1
3
3
1
1
1
1
1
9 Volt batteries (for flight only)
Perf Board
Ceramic Resistors (4 Ω @ 5W)
9 V connectors
White wire
Blue wire
Red wire
Black wire
IRL3302PbF MOSFET
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Hands-on: Heater Circuit
Set out kit (Switch not used)
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Hands-on: Heater Circuit
Layout Resistors on Perf Board
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Hands-on: Heater Circuit
Solder resistors in series using leads of resistors
4Ω
4Ω
4Ω
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Hands-on: Heater Circuit
Twist all the Red wires from the 9V connector
together and solder them to the single red wire in
your kit
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Hands-on: Heater Circuit
Twist all the Black wires from the 9V connector
together and solder them to the single black wire
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Hands-on: Heater Circuit
Check continuity for all “-” and “+” terminals to each
other
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Hands-on: Heater Circuit
Check continuity for all “+” terminals of the battery
with the end of the single RED wire
Check
continuity for
all “-”
terminals of
the battery
with the end
of the single
BLACK wire
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Hands-on: Heater Circuit
Put electrical tape on solder joints
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Hands-on: Heater Circuit
Solder the single RED wire from 9V connector to one end
of the resistor string and the WHITE wire to the other end
of the resistor string
4Ω
4Ω
4Ω
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Hands-on: Heater Circuit
Locate the IRL3302PbF MOSFET
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Hands-on: Heater Circuit
Solder the
IRL3302PbF
MOSFET to the
AVR board as
shown. Top pin
should be at
Column 15, Row
6.
Do not trim the
leads
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Hands-on: Heater Circuit
Solder the
IRL3302PbF
MOSFET to
the AVR board
as shown. Top
pin should be
at Column 15,
Row 6.
Do not trim
the leads.
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Hands-on: Heater Circuit
Solder the
IRL3302PbF
MOSFET to the
AVR board as
shown. Top pin
should be at
Column 15, Row
6.
Do not trim the
leads.
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Hands-on: Heater Circuit
Solder the other end of the WHITE wire to middle pin of
the power MOSFET
Should be at Column 17, Row 7
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Hands-on: Heater Circuit
Create at solder
bridge with
middle pin of
the MOSFET
and end of the
WHITE wire
at Column 17,
Row 7
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Hands-on: Heater Circuit
Solder the
BLUE wire to
the Column
15, Row 4
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Hands-on: Heater Circuit
Create at
solder bridge
with top pin of
the MOSFET
and end of the
BLUE wire at
Column 15,
Row 4
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Hands-on: Heater Circuit
Solder the
other end of
the BLUE wire
to the Row D,
Pin 4.
Trim wire to
minimum
length
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Hands-on: Heater Circuit
Solder the other end of the BLUE wire to the Row D,
Pin 4.
Watch out for solder bridges with other connections on
the D block
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Hands-on: Heater Circuit
Solder the
single
BLACK wire
from the
batteries to the
bottom pin of
the MOSFET
at GND on
Column 16
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Hands-on: Heater Circuit
Create a solder bridge with the bottom pin of the
MOSFET. DO NOT BRIDGE TO THE 3.3 HOLE.
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Hands-on: Heater Circuit
Attach 3 flight batteries and set assembly aside.
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Student Hands On Training I (2009)
Camera
Integration
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Hands-on: Camera Integration
Your camera has been modified so that it can be
activated by shorting two wires together
We will change the camera’s firmware later to allow it to
autonomously take pictures once activated
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Hands-on: Camera Integration
Your camera has been modified so that it can be
activated by shorting two wires together
We will change the camera’s firmware later to allow it to
autonomously take pictures once activated
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Hands-on: Camera Integration
Your camera has a two wires coming out of the camera
The connector will allow you to easily integrate the
camera unlike the heater which will be a pain
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Hands-on: Camera Integration
Those two wires are connected to a connector which is
connected to a MOSFET (similar to the heater
MOSFET)
Connected to the
MOSFET are two
wires, BLUE and
BLACK
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Hands-on: Camera Integration
Solder the BLUE wire to PORT D, Pin 5
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Hands-on: Camera Integration
Solder the BLACK wire to GRD
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Hands-on: Camera Integration
- Take your camera out of the box
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Hands-on: Camera Integration
- Insert the
batteries
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Hands-on: Camera Integration
- Disconnect the connector between the camera and the
MOSFET and turn on camera by shorting the two pins
together
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Hands-on: Camera Integration
- Set the date
and time
- Power off the
camera by
shorting the
two wires
together again
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Hands-on: Camera Integration
- Reconnect the camera to the MOSFET
- Be sure that RED goes to RED and BLACK to
BLACK
- Set everything aside and get ready for the POWER
ON SYSTEMS TEST (POST)
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Student Hands On Training I (2009)
Questions?
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