The system described here is a four motor rotary wing aircraft with 3 inch propellers. The overall size of version one is about four inches. A 418MHz digital radio is used for communications and control and an onboard PIC17 microcontroller and L293DD mosfet power chips drive the motors. The printed circuit boards form an X shape that serves as the
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frame that holds the motors, hence the name "PCB flyer". A second version of the flyer has been built using Astroflight Firefly motors with 16:1 gearboxes that turn 10 inch custom propellors at 2000 rpm. It uses Murata rate gyros for stabilization and is powered by a battery pack of four 2/3 size Tadiron lithium cells. The schematics and construction details of version two are described. The PCB flyer is a systems integration test bed that was constructed for exploring various approaches to communication, sensing, stabilization, and control. Exploration of algorithms and techniques for flight stability and semi-autonomous navigation requires a flexible and programmable prototyping platform. Such a platform is needed to validate physical simulations of both the flight characteristics and sensor functions. The system consists of two main parts, a custom transmitter on the ground for radio communications and control, and a flyer with onboard micro-controller, radio, and other peripherals. The motors are Watt-Age Sub Micro B2 motors with custom propellers similar to the B2 props but fabricated in both left handed and right handed versions. The battery is an eight-cell pack of 50 mAh Sanyo NiCads. Without motors or battery the flyer weighs 9 grams. The custom transmitter shown below uses a Great Planes Real Flight Futaba controller with a joystick port output plugged into a board containing a Microchip PIC17C756A...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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