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  • November | 2013 | sinusoid.in
    easily saved Kowalski as it only takes force to change his momentum and they were at rest 2 Tears rolling down Stone s cheeks when she tries to kill herself inside the soyuz This will not happen as there is no force acting downward Chris Hadfield demonstrates this here https www youtube com watch v P36xhtpw0Lg These lines from Wikipedia nicely sums it up Cuarón uses Stone to illustrate clarity of mind persistence training and improvisation in the face of isolation and the mortal consequences of a relentless Murphy s Law Also a quote by Fr Robert Barron The technology which this film legitimately celebrates can t save us and it can t provide the means by which we establish real contact with each other The Ganges in the sun the St Christopher icon the statue of Budai and above all a visit from a denizen of heaven signal that there is a dimension of reality that lies beyond what technology can master or access the reality of God Vikas Category Movie reviews Making a USB AVR programmer Okay Now that I have an AVR programmer working parallel port programmer the original intent need to be served i e to build a USB AVR programmer USBasp http www fischl de usbasp is a simple and popular USB AVR programmer that uses V USB s bit banging USB code http www obdev at products vusb index html to implement an AVR programmer But I didn t want to make a PCB or get it done from some expensive PCB fab and wait forever to get it So perfboard is a quick and moderately reliable option I found this cool technique of making professional looking perboard circuits http hackedfrompieces wordpress com 2013 03 17 tutorial professional perfboard That meant that I had to layout the circuit with 0 1mil grid Fired up Eagle and here it is The red top layer routes are jumper wires of course But when working from solder side this image needs to be flipped gimp to the rescue Here is the finished perfboard Component side Solder side For programming the ATMEGA8 with USBasp firmware I built a simple development board Murphy took a day off It worked on the first go Vikas Category AVR Electronics First time AVR microcontroller programming I ve started to experiment with the AVR microcontrollers The first hurdle for anyone who wishes to do so is a programmer Options are to either buy one or build one I didn t want to shell out Rs 500 to buy one But building one is kind of a chicken and egg problem in that I need a programmed microcontroller to build a AVR programmer USBasp For a programmer using discrete chips components you need to have access to either a serial port or a parallel port Fortunately I had an old Toshiba Satellite A80 laptop which had a parallel port So I built the STK 200 parallel port programmer Schematic can be found on http

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  • September | 2013 | sinusoid.in
    real surprises are hiding waiting to get you later on when it is more expensive to correct them Anything that has to be correct is usually the mistake And what seems like impossible behavior is really the poor IC trying its best to do a good job With a little help and the right attitude you can help the ICs along This kind of re states the Murphy s law

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  • August | 2009 | sinusoid.in
    plain some too flashy many have a cover picture which is a waste of half homepage some are disorienting with no separation between fields etc I mostly expect to post my electronics projects and maybe some rants about stuff Lets see how it goes Vikas Category Uncategorized Search for Recent Posts Monte carlo simulation in LTspice SP Road experience About Apple Watch Interesting links 1 About G R A V

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  • Vikas | sinusoid.in
    identified as compared to the official name Official name SP road name Soldering iron tip Soldering iron bit Solder flux Solder paste Film capacitor Box capacitor Category Electronics About Apple Watch Apple introduced their take on the wearable gadgets last month called the Apple Watch Well its actually named as apple logo WATCH Its strange how apple names its gadgets But anyway here are some of my thoughts about it Mostly about hardware The user interface problem Before Apple revealed the watch I was reading the rumours going around about the much anticipated iWatch Sites such as macrumors com thrive on such gossip By then android wear was already released and many companies already had hardware running it Samsung as usual with its brute force approach of market capture had already released and marketed two versions of its wearable devices But they all lacked in the user interface When the device is that small and so much interaction is needed then just a touch interface is not suitable So I was thinking what apple s solution to this problem would be Turns out they solved it with just a rotary encoder on the side They call it the digital crown Apple reinvents the rotary encoder It seems to work But a watch crown is designed to be rotated by holding your opposing fingers on the top and bottom of it This would be inconvenient because the bottom side of the crown is touching against the wrist In the demonstrations they showed using it with just a finger on the top side I doubt how accurate that would be We will know when its released in early 2015 The hardware As usual apple said very little about the hardware in the apple watch in their presentation Only showed some internal pictures and the main module which contains all electronics which they call the S1 Here is a picture of the internal floorplan of the different components On first impressions looks pretty neat and rugged with the all the metal and screws The bottom two thirds is taken up by the battery Actually apple does not quote its battery life figure and just says it needs to be charged every night along with your phone There were rumors that apple was struggling with battery life on it Maybe that s one of the reasons the launch date got pushed to next year so that the hardware and software can be tweaked for acceptable battery life On the top right is the digital crown and its tiny rotary encoder On the top is what apple calls the taptic engine Its just a fancy vibrator motor to alert the wearer On the top left is the looks of a speaker buzzer for notifications I guess On top over all of these sits the S1 chip Here is one of those instances where apple is dumbing down the terms for the non technical folks Its not a monolithic chip actually but rather a module containing many chips and passive components inside They say it is sealed off which is a good thing for such a use case They show the inside layers of the S1 module layer by layer which is pretty cool I have captured and collated them here In the image the top left sub image is the bottom layer and each image successively shows the layer above Seems to be a 6 layer board But its jampacked with components I think the PCB size was limited based on the area required for components and not routing resources Some other people have speculations about what chips are used and what might be the functions of the different chips based on their locations Here is an article on chipworks who guess the wireless chip is a broadcom BCM4334 by comparing its solder ball pattern Really cool Here is the article http www chipworks com en technical competitive analysis resources blog broadcom wins wifi in apple watch Some other things become apparent when examining the images There is a wireless connector on the top left which probably goes off to an antenna made using flexible PCBs wrapped around the watch similar to the pebble On the bottom right there is a footprint which has the look of a discrete transistor MOSFET which indicates power circuitry surrounding it So those were my views on the apple watch Lets see how it turns out Vikas Category Electronics Interesting links 1 I have the habit of browsing the world wide web for hours on end And usually come across many interesting links which I keep preserving as firefox tabs to read later but never get around to most of it And the tabs keep growing and growing So I thought to post those interesting links periodically hopefully maybe once a week so that I preserve them for later reference and also others might find it useful I ll add a little bit of commentary describing the links They will mostly be electronics related and other things which interest me Analog footsteps This is a blog written by Todd Nelson and I came to know about it from his interview on the Engineering commons podcast Its a blog about the history of silicon valley and its people It has great articles about crazy analog geniuses such as Bob Widlar and Bob Pease http analogfootsteps blogspot in Here is a link I came across when I was researching bit serial arithmetic Its a kind of calculation method where numbers bits are processed serially one by one to do arithmetic logical operations Its a slow approach but the electronic hardware required to implement it is very minimal Thats whats attractive about it http horningtales blogspot in 2006 07 bit serial arithmetic html Caltech has done a great job of open sourcing the wonderful Feynman lectures in physics Its beautifully laid out HTML edition which can be read online All diagrams are re done in vector art and looks crisp Feynman lectures

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