8
votes
Accepted
6
votes
Accepted
Difference between a 3 and 6 axis gyro
There is actually no such thing as a 6-axis gyro; the correct term for this is "IMU", which stands for "Inertial Measurement Unit". An IMU is a device that combines several inertial sensors that ...
- 2,957
5
votes
Accepted
What does the full scale range in a IMU MPU9250 datasheet signify?
TL;DR:
The configurable scale ranges for the accelerometer, gyroscope, and magnetometer on the MPU-9250 IMU affect the maximum resolution and range of the reported values.
As you increase the full-...
- 5,948
5
votes
What are the usual engineering considerations for a UAV current sensor?
Is the shunt resistor usually mounted high-side (i.e. at the positive battery terminal), or low-side (at the negative terminal), and why? Does it matter?
There should be no significant difference ...
- 5,996
4
votes
What does the full scale range in a IMU MPU9250 datasheet signify?
The full scale range is the largest value that the sensor can report; this is usually a balance of sensitivity to word length. If you have 8 bits to report the value, how many deg/s do you make one ...
- 5,996
4
votes
Estimate position of a balloon attached to a quadcopter
The simple answer would be a potentiometer, as used for position feedback in a servo. You apply a voltage to the outer two contacts and measure the voltage at the moving, middle connection.
The next ...
- 7,003
4
votes
Difference between a 3 and 6 axis gyro
A three-axis gyro measures the speed of rotation in three-axis - pitch, roll, and yaw.
A six-axis gyro is a slight misnomer, as it is a three-axis gyro with a three-axis accelerometer, which measures ...
- 5,996
4
votes
Optical sensors vs Ultrasonic sensors on a drone
TL;DR: it depends entirely on the situation in which you intend to use the sensors.
According to this article, it is entirely dependent on your application.
You’ve mentioned you want to use it for ...
- 4,412
4
votes
Accepted
Is there an open source video processing/sensor based follow me technology?
You may want to take a look at dronecode.org, or their supported projects. Especially, PX4 (which was also mentioned in another answer):
Getting Started with PX4 Autopilot guide
PX4's Follow-Me ...
- 156
2
votes
Is there an open source video processing/sensor based follow me technology?
The PX4 open-source flight stack has made some progress on various forms of computer vision. While not exactly turnkey, it’s an active area of development and you absolutely can buy hardware that ...
- 211
2
votes
What are the usual engineering considerations for a UAV current sensor?
Using PM07 power management board from Holybro as an example. They use shunt resistor on the high side. Voltage across the shunt resistor is then fed into the Texas Instruments INA169 current sense ...
- 411
2
votes
Accepted
Using BMP280 as an altimeter for CanSat
Sensitivity
Barometers are quite sensitive, however "air pressure" is very much not consistent. Generally, you can expect about one meter accuracy, maybe a bit less, from a barometer, once ...
- 1,039
2
votes
Accepted
Is it possible to attach I2C and USB based sensors to the flight controller and receive some outputs via telemetry?
i2c
Yes. This is how flight controllers talk to the already available sensors on board*. The addition of barometer and magnetometer sensors (and any other sensors that these flight control softwares ...
- 1,039
1
vote
Accepted
What are controllers of Parrot AR drone 2?
After reading relevant materials, i think I have find the answers for this question.
Q1:Since AR drone2 is a proprietary system, this company didn't publish any documentation about the internal ...
- 61
1
vote
Is roll rate, pitch rate and yaw rate same as gyro data along y-axis, x-axis and z-axis
The RC Rates are just the multiplicator value the Aircraft will try to execute your inputs. The resulting speed (degrees/sec) are just estimates based on a typical hardware configuration, without a ...
- 11
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