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Messages - rohitdesa

32
Project logs / Re: PSoC3 Custom Board
Debit cards may have problems. I have successfully used HDFC, CitiBank, and SBI credit cards. HDFC has a nice facility whereby you can create a 'temporary online credit card', without actually having a credit card. If you can find someone with an HDFC account with online banking you can do this.
33
Project logs / Re: PSoC3 Custom Board
I used Seeed for that. That was a an order for 100 boards. Got them cheap at about 80cents a board (about INR40) including shipping. But I've tried iTead as well, and both board houses are equally good (just stay within their minimum trace width limitations)
34
Project logs / Re: PSoC3 Custom Board
Kartik:

I use viewplot for gerber analysis. Which board house are you using for the PCBs - Seeed? iTead? iTead has a decent deal on 5units of 5x5. Do you happen to have an old motherboard to scavenge SMDs off? Else, if you're willing to wait for a couple of days, I'm heading to Pune for Christmas. I'll buy you the components you need in the smallest possible quantities and mail them to you.
35
Project logs / Re: PSoC3 Custom Board
Hey Kartik:

Any reason you're using a USB type-B connector? Why not mini-B? It may be cheaper (it is Rs.5 in Delhi) and since you're using an SMD PSoC, the mini-B will ensure a low overall profile. I may be going shopping in Delhi. Let me know if you need something bought.
36
Project development, ideas, and suggestions / Re: Nokia LCD Breakout Board for uC interface by easy compon
[quote author="kmmankad"]Though I havent done it yet,but would(nt) drag soldering work?[/quote]I've successfully used drag soldering with a very little quantity of solder and lots of good flux (Goot brand) on these connectors. However, unlike a regular drag solder, I would recommend against using wicking wire to fix solder bridges. Use the soldering iron to 'pull' away as much excess solder on the pins. And if things really go south then this connector can withstand a couple of blasts from a rework station.
37
Project logs / Re: DIY breadboard breakout LCD module
[quote author="arupbsk"]Rohit, your 3310 display looks like cheap china ones. Some work OK, but some duplicate displays causes issues in RAM addressing as I heard.[/quote]
A possible reason for the displays not working 'properly' is given in Miguel's blog post -
[quote author="Miguel A. Vallejo"]According to the info on Internet, Nokia's 3410 LCD uses a PCD8544 controller, the same as the Nokia 3310 LCD, so both LCD can be driven with the same firmware. Yes and no. Both LCD use the same PCD8544 instructions set, but screen resolutions are different. Original Nokia 3310 LCD is 84 x 48 pixels, but Nokia's 3410 LCD is 96 x 65 pixels, so LCD routines must be rewritten to use the new resolution.

After rewriting the routines, you must expect a working LCD, isn't it? Not again. The Nokia 3410 LCD have a visible resolution of 96 x 65 pixels, but the real resolution inside the LCD controller is 102 x 72 pixels, so you must to have this in mind while writing your code.[/quote]
38
Project logs / Re: DIY breadboard breakout LCD module
Hmm. Actually, mine is from an old Nokia phone. So your theory about the embossing is inaccurate. And I've build similar breakout boards for friends with the 'cheap China' displays, and have had absolutely no problems addressing any part of RAM. Then again YMMV.
39
Project logs / Re: DIY breadboard breakout LCD module
I built some a few months back.
Nokia 3310 to the left and Nokia 1100 on the right. The 1100 has a backlight built into the module, whereas external LEDs need to be added for the 3310.
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40
Project logs / Re: Free PCB Build - MCP2200 breakout
Hi bhishmar! Sorry for the delay in posting. Currently in the throes of end semester exams :-(  Replies to your queries are inline.

Quote
Hi rohitdesa
I am interested in information about the highlighted site above (allsensor.com). You have given him 5 stars, indicating you regularly buy from him.
Sorry for the confusion. The stars were only meant as an indicator that I have purchased online from them, not as a quality indicator.

If u dont mind pls answer my following queries, & give ur suggestions...
(a) How many times have you bought online from him. ( how long ago in year?)
(b) What is your experience for - prompt response for queries, delivery time, packaging, product quality etc.
I have bought twice from him in bulk to build kits. Quality-wise his components are good, and his prices are reasonable. Delivery through courier, so it should not take more than a few days to get to you after he has dispatched the goods. He doesn't attend to mails promptly, but you can call him. He's very courteous and accommodating on the phone. Packaging is decent - none of my goods came damaged.

I tried to buy from this site seeing your 5-stars. But my experience is so far very bad.
1. First his site is hopeless, Most products show their price as zero, effectively you cannot proceed with add to shopping cart , and buy these items. It seems risky to attempt atleast.
2. I tried to contact him thru (a) his site -contact, (b) site-enquiry, and (c) by email. All were ignored even after a week.
3. Finally I tried calling him. I found his name was "Vimal raval", He promised to help. But again end result no response to my queries.
His site is actually quite bad, and not updated at all. You do need to call him a couple of times to get him to sit up and take notice. Additionally, he pays more attention to quantity buyers; doesn't really do retail.

My interest was, His was the only indian site offering a collection of General Purpose PCB relays- even though price was shown zero!!! ( I am interested in 48V coil voltage relays industrial quality or any good quality). Most sites only give 12V or 6V relays. Even 24V relays are uncommon.

Nex robotics and OnlineTPS are more responsive to buyers of small quantities. Try them.
41
Project logs / Re: Free PCB Build - MCP2200 breakout
[quote author="kmmankad "]youre _the_ rohit de sa? A fellow electronics enthusiast and BITSG-ian here :)[/quote]Yes, its a tiny world! I'm getting such a kick right now from this! Thanks for the ego props :-P
42
Project logs / Re: Free PCB Build - MCP2200 breakout
[quote author="hak8or"]That is weird, E14 in the USA does not have such things, does INDIA have some requirements for doing online business like the tax form, or is it just something weird that E14 in India does?[/quote]India is trying to clean up its image :-) The number is there to streamline business deals and so that taxes go where they are due :-P The world of e-commerce, credit cards, online access is still new to vast parts of India. Infact, even today when I purchase electronic components, the shopkeeper ask me 'if I want a bill'. With a bill I pay 12.5% more as tax (a part of which the shopkeeper has to pay to the government). In the US everyone has an SSN to which everything is linked - purchases, sales, drivers license. So even though you're not providing E14 with a tax number, you buy by credit card, which is linked to your SSN, which is linked to you.
43
Project logs / Re: Free PCB Build - MCP2200 breakout
[quote author="arupbsk"]If a sales tax number is so risky, why shop owners show it in every bill? :P[/quote]Because it is their number. They will not get busted if they print it on a bill. But you certainly will, if you use someone's number. Like I mentioned above, if you buy small quantities and stay below the radar then its no problem. But large purchases are cross checked. If you're planning on making a small prototype run of 100 unit of a device, with components on each costing just INR200 my advice is not to buy with a fake CSTN. Still, its your call. Forewarned is forearmed :-D
44
Project logs / Re: Free PCB Build - MCP2200 breakout
[quote author="arupbsk"]Use any other's number doesn't matter they dont check if the number belongs to you or not. I have given the sales tax number I saw in a computer's bill. :P[/quote]A word of caution though, it is illegal to use someone else's number; it could land you in jail. The the number is used by the government for the purpose of tax collection from businesses. Business transactions are below a certain amount are exempt from taxation, so normally, if you don't buy anything ridiculously expensive on E14 you won't arouse suspicion. But expensive purchases will be taxed to the person whose number you're using. So unless you know the person whose number you're using, I would recommend against this approach.
45
Project logs / Re: Free PCB Build - MCP2200 breakout
I buy my stuff from a couple of places - Delhi (Lajpat Rai Market), Bombay (Lamington Road), Bangalore (SP Road). Here's an address list I posted quite a while back http://www.bits360.com/forum/where-to-g ... t2939.html. If you prefer buying online in India then there are quite a few 'stores':

    http://www.extremeelectronics.co.in
    http://probots.co.in
    http://www.nex-robotics.com/  *****
    http://www.triindia.co.in/
    http://robokits.co.in/
    http://www.onlinetps.com/  *****
    http://nskelectronics.in/
    http://www.rhydolabz.com
    http://www.ngesc.com/
    http://www.allsensor.in  ******
    http://www.feemo.in  ***** [/list]
    I frequent the starred shops. I also regularly buy internationally from:

      http://www.iteadstudio.com/
      http://www.seeedstudio.com
      http://www.sureelectronics.net[/list]

      Local dealers may not know if you ask them for a 3.3v regulator, but they would most certainly know if you ask for the LM1117A-3.3 :-) Tell them the specific part number.

      It varies from month to month but I spend roughly INR1000 (~USD20) a month, now that I've got a fair collection of tools. But all of that budgeting goes right out of the window when I need to pick up an oscilloscope or a rework station :-P

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