This page describes a project a colleague and I completed between September, 2000 and March, 2001 as part of the Engineering Physics degree program at the University of British Columbia. In summary this project involved building a USB device using the PIC 16C745 microprocessor from Microchip. The USB device consisted of a microphone, the microproc
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essor and other hardware and the device sent audio data to the host computer. This page contains notes, links and code extracts from this project relating to USB, USB Human Interface Devices, the 16C745 microprocessor, and specifics of this project. Hopefully this information will be helpful to your project. We achieved our goal and built a working device. This involved building the device hardware (microprocessor, microphone, and supporting electronics) and software (microprocessor code and host computer code). Unfortunately, the relatively low sampling rate by the microprocessor in the analog-to-digital conversion process mangled the audio signal to make it indecipherable at the host computer, but loud/soft transitions were easily detected. USB (Universal Serial Bus) is a protocol that allows two way communication between peripheral devices and a host computer. It is hot pluggable, allowing the device to be connected and/or removed while the computer is running. There are lots of other features of USB. The specifications for USB are available at. Be warned that while this information is very thorough, it is not very practical for developing a device or software. Technical documents are available at. There are two types of USB devices: high speed and low speed. There are differences in the type, length and connectors that can be used with the two types. Generally the requirements are stricter for high speed devices. A high...
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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