Computer Interface Circuits
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The circuit interfaces a commercial DCF77 receiver (available for about $15) with a PC using the RS232 serial port. By rewriting the program and/or modifying the circuit it`s possible to use also different systems or different I/O ports. The power is driven.... -
TNC and Modems ruled the world of digital communications until recently. With the advent of high speed computing and digital signal processing (DSP) all this has changed. If you own a home computer (PC) with a sound card, all you need to do is download.... -
Alphanumeric LCD displays have become very popular for microcontroller applications because they can add a lot to a project in a variety of different ways. A text message giving the user instructions as well as feedback can make the application seem much.... -
M1 is a stepper taken from an old disk drive. There are five pins, i. e. , common, coil 1, 2, 3 and 4. Resistance measured between common pin and each coil is about 75 Ohms. Driving current for each coil is then needed about 60mA at +5V supply. A Darlington.... -
The second program just sends "Hello world" to the PC. By default my board uses the Virtual COM Port (VCP) driver so you can view the output using Hyperterminal or similar program, I recommend PuTTY. The setup is quite simple, when I plug the PCB into my PC,.... -
The circuit is based on the PIC 16F877 microcontroller, see schematic in figure 4. The digital display output of the speech recognition circuit connects directly to the pins of the microcontroller. The LED in, provides a trigger that informs the.... -
My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres.... -
EIA/TIA-422 defines a Balanced (differential) interface; specifying a single, unidirectional driver with multiple receivers (up to 32). RS-422 will support Point-to-Point, and Multi-Drop circuits, but not Multi-Point [ EIA485 ]. EIA-485 devices may be used.... -
The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). ". Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in.... -
The I2C bus uses a bi-directional Serial Clock Line [SCL] and Serial Data Lines [SDA]. Both the SCL and SDA lines are pulled high via an Rp resistor. Resistor Rs is optional, and used for ESD protection for `Hot-Swap` devices. No other lines are specified..... -
The CAN Bus interface uses an asynchronous transmission scheme controlled by start and stop bits at the beginning and end of each character. This interface is used, employing serial binary interchange. Information is passed from transmitters to receivers in.... -
The CAN Interface is a Balanced (differential) 2-wire interface running over either a Shielded Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. Each node uses a Male 9-pin D connector. The Bit Encoding used is: Non Return to Zero (NRZ).... -
The HS-3182 is a monolithic dielectrically isolated bipolar differential line driver designed to meet the specifications of ARINC 429. This Device is intended to be used with a companion chip, HS-3282 CMOS ARINC Bus Interface Circuit, which provides the data.... -
This interface schematic shows the JTAG, Serial Wire, and ETM interface circuits of ULINKpro. Use this schematic to analyze potential problems with the target hardware. ARM websites use two types of cookie: (1) those that enable the site to function and.... -
I`ve been doing some CW contesting with my K2 and N3FJP`s Logging Software and since I now have this modern rig with computer control and everything I wanted to connect it up to my old Thinkpad and use the serial port for rig control and the parallel port.... -
Easy build and use, the general purpose Big LED with SPI serial interfacing. Expandable for multiple digits but still uses only three wires for receiving data from any uC boards. The circuit uses a serial-in-parallel out shift register, 74HC595 for receiving.... -
This self powered interface circuit electrically isolates the TxD and RxD lines from the PC serial port and protect the PC from direct connection to hazardous voltages. The isolator is intended to provide electrical isolation between a computer and the.... -
Library routines for 3-wire LCD interface based on 74HC595 shift register. More details are provided in the attached ReadMe document or posted at Do you want to unsubscribe in order to stop receiving notifications regarding "MikroC Pro for PIC driver routine.... -
This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: This time we design a frequency counter which can measure frequencies from 1Hz to 100MHz..... -
You need a TSOP4156 which can be a tough one to get or expensive to buy. I had plenty of old BPW41 Infrared diodes so I decided to build my own receiver. The power comes from the RS232 port, make sure you have at least 5. 5 Volts or the 4001 will not.... -
This design is for PC Soundcards obviously. If you need an interface for a Mac see my other page. For other computers and PCs without a soundcard you might take a look at Harmony Central`s interface page. I have built one of these myself, exactly as.... -
Implementation of CAN for use in aircraft. The protocol is called CAN-FIX and is a part of the MakerPlane Open Source Airplane project. You can get more information on CAN-FIX here. The idea for this project is to build an Arduino shield that will let it.... -
Here is the schematic circuit board. Each switch puts out -2V when it`s on and 0V when it`s off. The four 4067 chips multiples the 64 switch signals into 4 signals that go back to the main PIC board... -
Unlike almost all SMD resistors, the SMD ceramic capacitors are not marked with their values. To find the value of these capacitors we need a capacitance meter.... -
This threads explains how I`ve made my custom USB tyre pressure monitoring system by hacking this aftermarket kit bought on eBay. The first step was.... -
On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial.... -
build an interface board to connect some scientific equipment (for me, a pair of photovoltaic tubes) to a personal computer to acquire measurements results. Signal properties were following: two channels with a common ground, 1 second of acquisition time,....
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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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