design of the circuit and coding for the project`s stepper motor controller, the development of the circuit and coding for the speed-controlled DC motor for the project`s propulsion system, the circuit and coding for the system`s navigation system using a MEMS accelerometer circuit. This circuit is a bit of a departure from the rest of the content in this chapter,
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inasmuch as the appliance I describe here is not part of the E-2 project. The reason I have included this section is because the circuit and firmware illustrate several relevant and interesting points, including multidrop differential serial communications over relatively long distances and using the AVR`s internal RC oscillator instead of an external crystal. This application also provides a nice example of how the sorts of systems in this book can be used in real-world situations. I developed this device for a shipping center application used in two of a company`s warehouses. The products shipped from these centers consist of standard and customized kits of individually-packaged parts. A number of conveyor belts run through the warehouse area, past the various bins of parts. At the "start" end of each conveyor belt is a large matrix of 416 pigeonholes arranged as 26 rows by 16 columns. Before each shift, administrative staff stock these pigeonholes with pick-lists describing different standard subassemblies. Each pigeonhole has an indicator lamp (actually, an LED) over it. A central computer, connected to the company`s order processing system, controls all these indicator lamps over a piece of Category 5e cable that runs approximately 800 feet from the computer room to the warehouse floor; the indicator panels show workers along the conveyor belt which pick-lists to gather for an individual order as it progresses down the...
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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