Friday, January 09, 2015

IMU - Accelerometers and Gyroscopes

The ADXL345 from Analog Devices is a small, thin, low power, 3-axis accelerometer with high resolution 13-bit measurement at up to ±16 g.

Ben's HobbyCorner - Software - Bascom-examples On the right the ADXL345, connected to the I2c-bus, and when connected well, you will find it in the I2c-scanner. This is the Bascom-AVR code for the I2c-scanner. When the ADXL345 and the HMC5843 are fixed on the board you should see this in Hyperterminal.

 Bascom-examples ADXL345 connected to the I2c-bus

A Guide to using IMU in Embedded Applications

This guide is intended to everyone interested in inertial MEMS (Micro-Electro-Mechanical Systems) sensors, in particular Accelerometers and Gyroscopes as well as combination IMU devices (Inertial Measurement Unit).

See also on this blog - Accelerometers in Electronics

Read More Here - IMU - Accelerometers and Gyroscopes

Saturday, January 03, 2015

Vicacopter - Open Flight Robotics

Source code and many notes used in Vicacopter, the 1st English language source code for a fully functional helicopter autopilot.

Vicacopter - Open Flight Robotics

Vicacopter uses a ground computer for flight control. An 8 bit airborne microcontroller handles rate damping, PWM, & sensor capturing. The ground computer handles navigation & provides a simple instrument panel. This was the cheapest & most flexible way to fly. The system can be converted to a completely airborne autopilot very simply.

Vicacopter - Open Flight Robotics

Some Features
  • Automated landing & takeoff
  • Sonar position sensing for indoor flight
  • GPS position sensing for outdoor flight
  • Ground station instrument panel
  • Untethered communication from pilot to ground station
  • Curved or linear paths

The Tri-Roter one used 3 gyros for short term rotation sensing, 2 accelerometers for long term tilt sensing, 3 magnetometers for long term heading sensing, a high quality GPS module for horizontal position, a barometer for altitude sensing. A 3rd accelerometer was too sensitive to vibration & altitude changes to be any good. Because of the long term sensors & the very stable gyros, the orientation was always pretty accurate & didn't drift.

Analytical Instrumentation Technologies

Let us assume Physics, Chemistry and Biology as Verticals on a Horizontal plane called Science. A part of Physics developed into Magnetism and Electricity, which further evolved into Electrical Engineering a Technology. When a branch of Science is applied to develop, evolve and maintain Life on this Planet it becomes a Technology.

Electrical Engineering as a Technology has evolved and branched out into many specialized domains. With the coming of Semiconductors and the Advancements of Material Technologies, Electronics Engineering emerged as a foundation or a Horizontal for many new Verticals.

Analytical Instrumentation Technologies

One such Vertical is Instrumentation, here you know Industrial Process Control is one and the other is Test and Measurement. The third branch we learn about today is "Analytical Instrumentation Technologies" which is more like an Oblique, it Cuts thru Physics, Chemistry and Biology and many of its sub-branches. It also supports the areas called Life Sciences, Bio Technology, GeoSciences, Materials Science etc. .

Here i have posted some analytical instruments ... Laboratory Analytical, - Research and Lab Instruments, Bio and Earth Science. - - Test and Measurement Instrumentation.

Start Learning -
(I Inherited some chemistry apparatus and chemicals from my grandfather. This lead to a Tiny Physical and Electro-Chemistry lab in the Store Room and later the Garage when i was at school. That is one of the reasons my website has the name delabs and i created a blog called "Analytical Bionics" around 2004. Later those posts were integrated in my other blogs.)