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1
Clauss AdelineLy Nathalie
GE5S
GE III Project
January, 16th 2008
The altitude and speed measuring system of the drone
2Plan
Clauss AdelineLy Nathalie
GE5S
January, 16th 2008
1. Specifications of the project
2. Hardware design
3. Software development
4. Testing
5. Conclusions
3Part 1. Specifications of the project
The Drone
4Part 1. Specifications of the project
On-board electronics
Motors
Control
Speed sensor
Altitude sensor
MicrocontrollerPIC18F2520
DSP Data exchanges
and treatment chain
Inertial measurement unit
Rangefinder
GPS
Amplificationstage
5Part 2. Hardware design
Sensors choice
Atmospheric pressure sensorMPXA6115A by Freescale
+Differential pressure sensorMPXV5010DP by Freescale
Scale used : 0 < ΔP < 250 [Pa]
Scale used : 800 < P < 1100 [hPa]
Altitude range :0 < a < 200 [m]
Speed range :0 < a < 25 [m/s]
6
Amplification stage
Part 2. Hardware design
Speed sensor
Altitude sensor
18F2550
AD channel
AD channel
Vref- Vref+
Amplification
0.2V
to
0.4V
1.66V
to
4.86V
Amplification3.0V
to
4.5V
0.71V
to
4.89V
Vcc
6
Offset
Offset
Operational amplifiersMCP6144 by Microchip
7Part 2. Hardware design
PCB
Microcontroller
Supply stage
OAs
Amplification stage
Low-pass filter
Speed sensor
Altitude sensor
8Part 3. Software development
Means
MicrocontrollerPIC18F2520 by Microchip
Pickit2 Programmerby Microchip
programmation communication
9Part 3. Software development
Algorithms
Initializing µC A/D tool USART tool
A/D Conversionchannel 0 (speed)
Send data(speed)
Calculation(speed)
Getting reference P0
channel 1 (altitude)
A/D Conversionchannel 1 (altitude)
Send data(altitude)
Calculation(altitude)
10Part 4. Testing
• Determining OA real characteristics
Speed sensor characteristic :
11Part 4. Testing
• Determining sensors real characteristics
• Testing the software…
12Part 5. Conclusions
Technical conclusions
Fully working PCB
Positive ending
Cheap development
Work of research, prototyping and communication
Heavy problem for PCB printing
13Part 5. Conclusions
Personal conclusions
Promoting « Génie Electrique » to the Mechatronics
Improving our communication and self-control
Improving hardware debug abilities
14
Clauss AdelineLy Nathalie
GE5S
January, 16th 2008
Thank you for your attention