These BCD-to-decimal decoders consist of eight inverters and ten four-input NAND gates The inverters are connect- ed in pairs to make BCD input data. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . Texas Instruments 74LS42 Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments 74LS

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So pins R2 and C3 are connected when S7 is pressed. This needs work, but I made this keypad part for Fritzing: Plug it into any machine including a Raspberry Pi and it will be identified as a keyboard.

No drivers are required. The code is based on datasyeet standard Arduino Keypad library basic demo. That code was meant for a different keypad, so I eventually found a configuration that worked in the Sparkfun 12 button keypad datasheet. The wiring is as simple as it could be: This is a trivial example, but at least it shows that anything you can do with a button, you can also do with this hand-clap sensor.

74LS42 PDF 데이터시트 – Decimal Decoders – National Semiconductor

Well, that was easy! I want to make an edge-lit numeric display.

These were a common technology before numeric LEDs were available. They use 10 illuminated slides to display individual numbers.

You feed it a 4-bit binary-coded decimal input, and the chip activates one of ten outputs. Video link for the iframe-averse: It just fits on a half-sized breadboard:. The chip also uses active low outputs: The negative side of each LED goes to an output pin, and the chip sinks current when an output is selected, lighting dxtasheet LED. All it does is cycle through digital outputs 4—7, incrementing a bit every half second. If you felt really fancy, you could drive the LED inputs through PWM, and come up with just the right of flicker to make this look like a Nixie tube.

You should also be able to chain the inputs through some shift registers, too. These DECTalk boxes were compact and robust, and — despite not having the greatest speech quality — gave valuable datashet, telephone and reading accessibility to many people.


DECTalk hardware remains expensive, partly because of demand from electronic music producers its vocoder-like burr is on countless tracksbut also because there are still many people who rely on it for daily life. The Emic 2 is really marketed to microcontroller hobbyists: Make Your Arduino Speak! In a pinch, you can use the serial monitor that is in the Arduino development environment.

Whether you get the prompt datasheft not depends on whether local echo is set or not. Either way, try sending this line:. You should get the: Yes, you can make it sing. No hippies — nekkid, or otherwise — were harmed in the making of this recording. These DECTalk boxes were compact and robust, and It seems that this is a known problem.

It needs a little doohickey to attach to my meter, which Newark sent out by separate cover.

This is how it turned up:. See the little orange thing on top? Thing is, the little doohickey is a tough injection moulded polymer part. It could probably be dropped in a padded envelope and survive any mail journey.

74LS42 BCD to Decimal Decoder

Newark really need to get a handle on their packaging. It needs a little doohickey to attach to my meter, which Newark The 74ps42 counter is basically an Arduino repackaged to feed the attached LCD. I just built my first Atari Punk Consolea simple LM -based noisemaker beloved of the circuit-bending crowd and pretty much avoided by everyone else.

Jimmie P Rodgers sells a nice board or kitand I bought a few boards a while back, and only just built one up now.

The APC sounds a little like a drunken, flatulent bee banging around in a lager can, so you really want to be able to turn this thing off.

Lastly, the LUSH tin is nicely curved, and fits in your hands well. I just built my first Atari Punk Console, a simple LMbased noisemaker beloved of the circuit-bending crowd and pretty much avoided by everyone else. Jimmie P Rodgers sells a nice The last one, a rip-off of an Extech, decided to show me how datasheeet wires were connected to the probes. One that had heft and gravitas, like the Avo 8 that my dad used to bring home from work.


So I bought an Agilent. Reliable company, all the right features, beeps politely only when required; a very, very sensible meter. Then I found these in the package:. Skins on a meter? Meters are sensible things used by sensible people.

The last one, a Pretty much everyone tries the RGB colour datasheeet when they get their first Arduino. This variant cycles through the HSV colour wheel, though at fixed saturations and values.

The circuit is very simple: Skip to content This needs work, but I made this keypad part for Fritzing: The only passes inputs from 0 b to 9 b. All other inputs result in no output. The outputs are really more like 1—10 than 0—9, as a zero input activates the first output.

74LS42 PDF Datasheet浏览和下载

It just fits on a half-sized breadboard: Either way, try sending this line: SAll watched over by machines of loving grace. Notes The Emic 2 has no serial flow control, so you have to wait datqsheet the module stops speaking or you send it the stop command before you can send more. Until you see the prompt, any text you send it may be lost. The Emic 2 is an embedded device; Unicode is a bit of a stretch. Starting every speech line with S may make this board incompatible with assistive technology software such as the JAWS screen reader.

The output from the audio jack has a fair bit of noise on it, and you need to set the volume dahasheet low to avoid hiss and hum. Your experience may be different, as I may have accidentally made a ground loop. Many DECTalk resources on the web like these songs use v4 or older, which are subtly incompatible. This is how it turned up: Wit the lid closed, it looks like this: Well … Share this: Then I found these in the package: