Computer Interface Circuits
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This week we were in a Southern mood in anticipation of Spring Break, so we initially decided to build a LassoBot. This robot throws a lasso in a circle until an object in the lasso`s path is grabbed on to. At that point, LassoBot reels itself closer to the.... -
An LCD -liquid crystal display is an electronically-modulated optical device made up of any number of pixels filled with liquid crystals and arrayed in front of a light source (backlight) or reflector to produce images in color or monochrome. The block.... -
This circuit is uses for the general purpose Big LED with SPI serial interfacing. The circuit is using a serial-in-parallel out shift register, 74HC595 for receiving serial data from microcontroller board. This is the figure of the circuit. For wiring the.... -
This is an interface circuit for digital data input. This circuit consist of touch button, op-amp, diode, capacitor and resistors. Any conductor surface can be... -
This is a simple 220V power interface circuit. This circuit used as interface for monitoring electric devices and equipments using a computer. The circuit only... -
Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction. This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through.. -
So you`ve read about my Computerized Room or have seen those nifty home automation products advertised in the back of electronics magazines Or perhaps someone you know has done something similar. At any rate, you have decided to try it yourself. The first.... -
This is the standard configuration on how to Interface a uC like 8051 to PC RS232 with MAX232A. The UART or Serial port was not present in 8049/8749 chips which were the ancestors of 8051/8031. Pages of code were needed to make a software UART in MCS-48. The.... -
Usually keyboard is connected by using matrix type of connection a‚ rows and columns. For instance for 12 button keyboard wee need 3 4 digital inputs of microcontroller. There is a way to build keyboard and connect to microcontroller using only one wire. For.... -
RS-232 Serial Interface Status Indicator Circuit. I designed this circuit many years ago and have used it several times since. It uses a single logic IC to indicate the TXD and RXD... -
Below are three examples of controlling a relay from the PC`s parallel printer port (LPT1 or LPT2). Figure A shows a solid state relay controlled by one of the parallel port data lines (D0-D7) using a 300 ohm resistor and 5 volt power source. The solid state.... -
An HD44780 Character LCD is a liquid crystal display (LCD) display device designed for interfacing with embedded systems. These screens come in a variety of configurations including 8x1, which is one row of eight characters, 16x2, and 20x4. The most commonly.... -
Like so many others, we found a nice 1.8"" TFT display in China, and we decided to make a breakout for it. Instead of just breaking out the pins, and perhaps adding the micro SD card holder, we equipped our version with an USB enabled microcontroller and a.... -
Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed in series with the transformer line connection to prevent DC current from flowing in the.... -
It uses very common building blocks. The high voltage power supply is a classical oscillator circuit used in many places where a low current and high voltage is needed. TR is a step-up transformer salvaged from a xenon light circuit. You can find simmilar.... -
Peripheral circuit is very simple, it is DAC schematic circuit diagram of the USB interface which adopts PCM2702 to make the picture, the Ausgang of circuit can be connected with the power amplifier directly, can drive earphone of more than 32 ohms too... -
IC bus line explains conduct and transmits the bus line as one kind, it uses and is wired little, simple in construction, it is the extensive high-performance bus line way of a application. The operating system that and Linux cuts out publicly and easily as.... -
The FTDI DLP-USB245M is a USB-to FIFO interface module that simplifies the control of multiple steppers by a PC.. -
Cable and xDSL modems are experiencing increasing popularity. For this reason, many designs are now required to interface with existing telephones at the subscriber`s location. The subscriber line interface circuit (SLIC) within the modem has the additional....
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Control RGB LED strips via a USB or ethernet interface. These strips consume a lot of power and the mass produced controllers suck. I would also like independently controllable "zones" if you will, so ideally this device could power 1 or more strips. Since a.... -
Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or.... -
The transformer is a 600:600 ohms transformer (also named 1:1 ratio 600 ohm transformer) : more or less the same number of turns on both primary and secondary coils, and optimized to work at 600 ohms load. Selectronic sells one here. I measured the primary.... -
This design is based on that of Andrew Bruno. His design appeared under the name of "bruno-if". My contribution was to provide Postscript files for a Printed Circuit Board. This circuit is quite old and goes back to the days of NMEA-0180 and 0182. Note that.... -
My task for the system was to implement and program all the hardware devices and make data available to the receiver program running on the PC. This includes the configuration of all Prospeckz devices and implementing protocols for radio transmissions.... -
Here s a design of the circuit diagram of RS422 interface. Connector K1 is linked to the serial port of the PC, power to the PC side of the circuit is derived from the signal lines DTR and RTS. Positive supply is derived from RTS and negative supply.... -
Well, I guess every hobbyist some when comes up with ideas of controlling or measuring something with a PC. Of course the idea is tempting, there are so many easy-to-learn program languages available for PCs today that almost everyone can write the software.... -
Many modern motherboards are equipped with an infrared data interface compliant with the IrDA standard, but this interface not very often used. However, it is not difficult to build a data transmission module and connect it to the corresponding header. As.... -
Circuit The following schematic shows the design of a Parallel Port Interface Circuit Diagram using 74HCT373. The 74HC/HCT373 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). This parallel port interface circuit....
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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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