This is a portable oscilloscope adapter that it can be held in breast pocket. Its operation is only sampling and sending to host PC. The most of functions of the oscilloscope are processed by host PC. Therefore, oscilloscope adapter can be simplified. This oscilloscope adapter using a TMP47P242VN 4bit microcontroller for acquisition control. But it is difficult to obtain and to programm personaly, so that I recommend to replace the microcontroller with any other microcontroller, such as PIC and AVR, when you want to follow this project. The details of the acquisition controller is as follows. Communication format between host PC and oscilloscope adapter is N81 (no parity, 8 data bits, one stop bit). Data transfer rate between oscilloscope adapter and host PC is 115.2kbps.
Click here to download the full size of the above Circuit.
For others there is no especialy technique, only amplitude input signal, sampling with microcontroller with integrated ADC, and sending wave form data to host. The sampling rate of 10ksa/sec is dissatisfied as a digital oscilloscple. This restriction on sampling rate is by be linked between acquisition unit and host PC with the RS-232C. However, it will be useful on the lower frequency signal. Negative and positive powers for the analog circuit is generated with charge pump of the MAX232AC. The MAX232AC is useful when using OPAMP with single +5V power supply. For range changing, this is controlled by host PC with atteneter and amplification value control commands. This is the minimun required transfer rate for real-time transmission of sampled data of 10ksa/sec. And command transfer speed of from host PC to oscilloscope adapter is 9.6kbps.
The acquisition controller will enter state of command waiting after power-up. One byte of command value range is from 0x50 to 0x5F, any other value will be ignored. The controller outputs lower four bits to P01-P03, wait for one milisecond, and enter to sampling state (sampling loop). In sampling state, anything data is raceived from host PC, acquisition controller will return to command waiting state. Host PC must send a 0x00 before sending any command.
When above protocol is satisfied, control program will be able to use without any patches. But remaking the controll program as...
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.....
characters left: