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| Clicks: 8974 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Speech Recognition Circuit
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The demonstration circuit operates in the HM2007's manual mode. This mode uses a simple keypad and digital display to communicate with and program the HM2007 chip. When the circuit is turned on, the HM2007 checks the static RAM. If everything checks out the board displays "00" on the digital display and lights the red LED (READY). It is in the "Ready" waiting for a command. To train the circuit begin by pressing the word number you want to train on the keypad. The circuit can be trained to recognize up to 40 words. Use any numbers between 1 and 40. For example press the number "1" to train word number 1. ..
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Crossed from: Computer Interface | Clicks: 6791 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
DVI to PAR digital video interface with LCD
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This page describes a cheap and simple yet flexible HDMI to parallel 3.3v interface. This allows to connect most LCDs frames to the beagleboard without any further interface required. I am using this myself with some 7inch 800x480 displays which i am using to run Angstrom Linux as well as the maemo on beagleboard project. I have used these lately for some work on Meego. The hardware is rather simple and doesn't consist of much more than the TFP101A panel link receiver from TI. This chip directly outputs 3.3V signals. The dvi2par routes these signals though 22R resistor arrays to reduce reflections. The resulting signals can be fed directly into a LCD screen as depicted below...
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Crossed from: Computer Interface | Clicks: 19880 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Ethernet board for C64 and SX-64
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Once i had my SX-64 repaired i wanted to do something cool with it. I learned about people who added ethernet interfaces to their C64 and since i had some spare ones of the required ethernet chips, i decided to build the net64 cartridge. See the image above for my SX-64 with the net64 cartridge installed. The net64 cartridge is compatible to the final ethernet cartridge and can be operated with software developed for the tfe...
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Crossed from: Thermometer Circuits | Clicks: 2921 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Advanced LCD Graphic thermometer
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A unified thermometric controller that can be programmed with simple scripts, integrating the "classic" thermometer/controller pair. You can build a variety of simple machines with the same hardware and a different script : a charting thermometer, a vending machine that dials your number when empty, a leavening cell. thermometer with 1°F (0.5C) resolution. four switch inputs, four relay outputs. only an handful of cheap parts. graphic LCD display...
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Crossed from: Display Circuit | Clicks: 9731 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
5x7 LED display schematic
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Your 5x7 display is my favourite toy; the tunes and graphics in the elevator display always impress my mates!
Since building the display I developed my own 400 dot matrix using a pic and the SN74154 [4bit binary to 1 of 16 demultiplexer\counter] - in place of the 4017. It works well but I still have to hook it up to my computer to change the scrolling message. When I get time I will write
another program that will make it easier to program the message board via an I.R. remote...
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Crossed from: AVR Microcontroller | Clicks: 26 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
RCEN fuse programmer with AT90S1200A
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As you know the AT90S1200 microcontroller include an internal RC oscillator that is disabled by default. If you want to change it (enable or disable) you must to program it with parallel mode. The most programmers working with serial mode and its not possible to program this fuse bit (RCEN). With this stand-alone programmer you can now enable or disable the internal RC oscillator that is working at ~1MHz.
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| Clicks: 13575 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
church bell with timer and LCD
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This circuit is a church bell controller. Basic component is an ATmega32 microcontroller. At the circuit 2 24LC32 eeprom memories is being used, the 1st for internal standard melodies and the 2nd one is for user's compositions. This feature will be provided in the future. As control I created a menu who will be appeared on 4x20 LCD (Liquid Crystal Display). The menu browsing can be done by 6 buttons at the face of the circuit's box (Menu, Up, Down, Enter, Start, Stop). The all firmware binds about 19Kbytes flash memory and can be increased by adding new features-functions. This program has been writen in C in CVAVR compiler. The idea of this circuit is being given by a friend of mine who has an foundry and he is building bells. I have made the PCB by my self.
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Crossed from: Remote Control | Clicks: 12657 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Infrared relay remote control
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Having to use the infrared remote control, we will procure in addition to modulate the Nutchip infrerossi receiver. Do not let the name fool you, because more than one module component that looks like a large transistor. We use as a reset Nutchip external RC network consisting of R3 and C1. The capacitors C2 and C3 instead serve as a bypass, and filter feeds Nutchip and infrared receiver. Perch? be effective must be mounted very close to the integrated they have to protect. ? infrared receiver connected directly to the REMOTE Nutchip, a pull-up is not already contained within the perch? ? Nutchip. Note that all unused inputs are locked to the positive...
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Crossed from: Remote Control | Clicks: 17505 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
RF 433MHz - 3 channels remote control
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The schematic is very simple and includes, in addition to Nutchip, with its three driving transistor and LED, the radio receiver. The data come from the OUT pin of the receiver and enter the pin REMOTE remote control. The RESET pin connected to an external RC delay. If you need to mount the telecomandodove is required uninterrupted service 24 hours on 24 or in electrically polluted environments sar? then best to use a special built for RESET. Notice that the unused input pins are connected to the positive: a good habit that makes life difficult for disorders. Even the capacitors C2 and C3 are used to "clean up" the voltage from any radio interference that slip into the receiver must be mounted as close as possible to the terminals of receiver, with wires short to ground...
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Crossed from: Timer Circuits | Clicks: 18269 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Timer circuit II
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Timers are fundamental building blocks, and as such timers are found in practically every electronic circuit. There are many kinds of timers, available off-the-shelf from resellers of electrical and electronics goods, because circuits circuits involving timers have thousands of practical applications. In this article we will explain how to build six different timers from the same base circuit.
Nutchips are ideally suited for building timers. Not only the timers differ only for the truth table programmed inside the Nutchip, there is also room for ingenuity, and you master the basics you can customize the timer adding your custom logic to the truth tables shown here...
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| Clicks: 11264 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
START-STOP circuit
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We are going to build a START-STOP drive (as commonly found in professional tools), that is a circuit with one switch to run the output (an LED in this case) and one switch to stop it. Nutchip feature two kind of inputs: general purpose and fixed inputs. General-purpose programmable inputs (namely IN1 ... IN4) work according to the truth table we program into on-chip memory. A free - not connected to anything - input is always at logic level 1. Connecting the pin to ground (GND, the negative power supply rail) an input will assaume logic level 0. When we want to use a key (or a switch), whe connect it to an input on one side, and to GND on the other. ..
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Crossed from: Remote Control | Clicks: 12689 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Remote controlled LED
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The remote control transmits encoded signals. Each time a key is pressed, the relevant code is transmitted, usually repeating it many times to ensure reception. This encoded signals travels over a radio or infrared-light beam, to eventually get captured by the receiver. The receiver includes a sensitive circuit capable to transform those weak radio-clicks or infrared flashes in an electric signals with only two logic levels, zero and ones. The logic levels appear as train pulses relfecting the original code: they conneot be used directly, as the need to be decoded in order to determine which key was origianally pressed. ..
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Crossed from: Remote Control | Clicks: 2510 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Single-channel remote control
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In this project we'll see how to build a single-channel remote control. It 's a project easy to do : by using a radio module pre-assembled, we will get a card compact without sacrificing performance major. The insert function allows Nutchip impossible to obtain with a remote commercial: here are some suggestions from our readers. timer function : with a remote button, the relay remains energized for a time. mixed-function : two buttons switch on and off the relay, the third on for a short time, the fourth for a long time. delay function : By pressing the button on the remote, the LED lights now, but the relay is activated only after some time...
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Crossed from: Decoder Circuit | Clicks: 16204 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
7-segment display with encoder
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This design explains how to use an encoder to set the number shown by a 7-segment display. Turn the knob clockwise to increment the number, turn it counterclockwise to set it back. Encoders are the most practical (and handy) way to set a large number of digital devices. Think of an alarm clock, would'nt be easier to set the alarm time simply turning a knob, in place of frantically pressing a couple of buttons? By the way, grandma alarm clock works exactly in that way. The circuit counts four main parts (Nutchip, encoder, display driver and display), nonetheless should not be difficult to understand. Its a matter of connecting two Nutchip inputs to the two encoder pins, and all four Nutchip outputs to a 4511 7-segment display driver. ..
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Crossed from: Game Circuit | Clicks: 6119 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Electronic dice with 7 LED
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This project takes advantage from -HOLD input, which is connected to push-button P1. As long as the -HOLD input is low, truth table's timeouts have no effect because this input serves to disable any state change provoked by timers. The effect is to freeze Nutchip's counting, stopping the LEDs on the number they were displaying at the time of key release. Notably, we could have used -STOP input to get the same effect, although this does not apply as a general rule - there are occasions where these two pins behave differently.
A 390 ohm resistor (R5) keeps -HOLD pin at low-level when P1 is released: so the numbers do not change and the LEDs display steadily the last number drawn. When pressing P1, the -HOLD input goes to +5V because of the button's action - ovverriding R5 effect. Nutchip timer is no longer blocked and it keeps changing state at a fast rate, giving a random rolling effect as long as P1 is pressed...
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