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You are here: Home / Archives for Drones

Drones

October 31, 2023 by David Such Leave a Comment

Arduino Library for the Stewart Flight Simulator Platform

The Stewart Platform, also known as a hexapod, motion base or parallel manipulator, is a mechanical system that consists of a platform connected to a fixed base through six independently actuated legs. This arrangement allows for precise and versatile motion control in all six degrees of freedom (DOF): three translational (surge, sway, heave) and three rotational (roll, pitch, yaw).

In the context of flight simulators, the Stewart Platform is utilized to replicate the dynamic movements and sensations experienced by pilots during flight. It provides a realistic simulation of aircraft motion, enabling pilots and trainees to practice flying maneuvers, emergency procedures, and various flight scenarios in a controlled environment. By synchronizing the movement of the platform with visual and auditory cues, flight simulators enhance the training experience and help pilots develop their skills without the risks associated with actual flight.

The Stewart platform is used in car/flight/VR simulators, machine tool technology, animatronics, crane technology, underwater research, simulation of earthquakes, air-to-sea rescue, mechanical bulls, satellite dish positioning, the Hexapod-Telescope, robotics, and orthopedic surgery.

We will be using it to test our drone flight control hardware, IMUs and associated software. You can read the full Stewart Platform article on Medium.

Filed Under: App Development, Drones, Embedded, IoT, Robotics

October 31, 2023 by David Such Leave a Comment

Reefwing AHRS Arduino Library for Drones

The Reefwing AHRS library provides an Attitude and Heading Reference System (AHRS) class for use with Arduino compatible boards. The library has been tested with the Arduino Nano, Nano 33 BLE, Nano 33 BLE SENSE (REV 1 and REV 2), Nano 33 IoT, MKR Vidor 4000, Portenta H7 and the Seeed XIAO nRF52840 Sense boards.

An Attitude and Heading Reference System (AHRS) takes information from the Inertial Measurement Unit (IMU) and processes it to provide reliable roll, pitch and yaw angles.

The full AHRS article is available on Medium.

Filed Under: App Development, Drones, Embedded, IoT

May 26, 2023 by David Such Leave a Comment

An Arduino DC Motor Dynamometer Shield— Part 1

We needed an instrument that can plot the voltage/thrust curve for any BLDC motor and propeller combination. We use Pulse Width Modulation to control the Electronic Speed Controller which drives the motor, and it would be nice to be able to relate the PWM percentage to thrust. Our first prototype used Force Sensing Resistors which will be compared to load cells. #arduino #fsr #dyno #shield

https://reefwing.medium.com/an-arduino-dc-motor-dynamometer-shield-part-1-54efd0c3e7e6

Filed Under: Drones, Embedded, Robotics Tagged With: Arduino, FSR, Shield

April 25, 2023 by David Such Leave a Comment

An Arduino Library for the x-IMU3 GUI, IMU Data Visualisation Tool

IMUs with 3 sensors each measuring 3-axes, pump out a lot of data. It can be difficult to work out how your IMU is performing, which is why the free open source data visualisation tool from x-io Technologies is so great. It is available for all major operating systems (Windows, macOS, and Linux). #arduino #imu #datavisualisation #datavisualization

Read all about it in our latest article on Medium:

https://reefwing.medium.com/an-arduino-library-for-the-x-imu3-gui-imu-data-visualisation-tool-e5aaacf894a7

Filed Under: Drones, Embedded, IoT, Robotics Tagged With: Arduino, datavisualisation, IMU, LIbrary

April 13, 2023 by David Such Leave a Comment

Reefwing LSM9DS1 Library for the Nano 33 BLE Sense

This article explains how to write a C++ library to control and monitor the LSM9DS1 IMU sensor using an Arduino. If you want to really understand how a sensor operates, then write a library for it. It will take longer than you think, but the effort is worthwhile. This library can be downloaded using the Arduino IDE Library Manager or directly from our GitHub repository.

Read the rest of the article on Medium…

Filed Under: App Development, Drones, IoT Tagged With: Arduino, IMU, LIbrary, LSM9DS1, Nano33BLE

November 19, 2022 by David Such Leave a Comment

An Arduino Nano Electronic Speed Controller (ESC) — Part 3

In Part 1 we introduced our Arduino based ESC and followed this in Part 2 with an explanation of the power stage and MOSFET drivers. Part 3 focusses on the bootstrap capacitor which is part of the driver circuit used to turn the high-side MOSFET hard on. #arduino #bldcmotor #esc #bootstrapcapacitor #IR2110

https://reefwing.medium.com/an-arduino-nano-electronic-speed-controller-esc-part-3-e17392bd2887

Filed Under: App Development, Drones, Embedded, Marketing

November 16, 2022 by David Such Leave a Comment

OLED Displays are slow!

We have been prototyping an Arduino based Electronic Speed Controller and planned to include a 0.96″ OLED display. Tests on an Arduino UNO, clocked at 16 MHz, have shown that this display could best be described as sluggish! Even using SPI, printing out 3 lines of text results in a loop cycle time of 15 Hz. Quelle horreur! This prompted us to investigate further to understand the bottlenecks, SPI vs I2C speed, and whether there were any work arounds. #arduino #oled #SSD1306 #DFR0650 #SPIvsI2C

https://reefwing.medium.com/oled-displays-are-slow-2f422840d735

Filed Under: App Development, Drones, Embedded, Robotics

November 14, 2022 by David Such Leave a Comment

An Arduino Nano Electronic Speed Controller (ESC) — Part 2

Part 2 focuses on the power stage (AKA 3-phase bridge) and why MOSFET drivers are needed.

This series of articles was sponsored by PCBWay. #arduino #shield #ESC #bldcmotor #pcbway

https://medium.com/@reefwing/an-arduino-nano-electronic-speed-controller-esc-part-2-2bb5ec7c309a

Filed Under: Drones, Embedded, Robotics

November 10, 2022 by David Such Leave a Comment

How to Design an Arduino Electronic Speed Controller (ESC)

Having delved into how BLDC motors operate and provided an overview of trapezoidal sensorless control, we can bring it all together in the design of an Arduino ESC shield. This turned out to be much harder than we expected – now we know why no-one does it!

This series of articles was sponsored by PCBWay.

#arduino #shield #ESC #bldcmotor

https://reefwing.medium.com/an-arduino-nano-electronic-speed-controller-esc-part-1-4f65076fb2e4

Filed Under: Drones, Embedded, Robotics

September 9, 2022 by David Such Leave a Comment

How to Write your own Flight Controller Software — Part 11

Controlling brushless DC (BLDC) motors is a lot harder than brushed, particularly if they don’t include a sensor for rotor position. This is why Electronic Speed Controllers (ESC’s) exist. In Part 11 of our series we demistify BLDC motors and their control.

https://reefwing.medium.com/how-to-write-your-own-flight-controller-software-part-11-dee7feef05f2

Filed Under: Drones, Embedded

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