Hi Santoshaxl, We have prototype of this ultrasonic distance meter circuit and which is working well. can you tell us why seven segment display will not work in this circuit? You may be having solid reasons which we would like to share for improvement....! You may reply to efylab@efyindia.com
Hi Pranam77, the quality of PCBs supplied by Kits'n'Spares have been improved. Earlier it was in paper epoxy and now it has been upgraded to glass epoxy PCB. You must be having an old PCB...! As far as wrong PCB is concern, kindly mention the name of the project, so that we can take corrective action. Rest assured we are open to suggestions for improvement as it is our magazine, including you...!
Hmm..so EFY is in a effort to create "good electronic engineers"....LOL..i think the day to day work and face new problems leads you a good electronic designer
As I see most of websites request money to access news and whole information.
I think eetimes is more useful to get lastest news for electronics.
Actually I need one more website like eetimes.Another websites you shared don't offer many news or they request money and subscription for reading whole news and info.
hi sir i have assembed uC (89c2051) based ultrasonic distance meter published in efy.. Its not working and display shows random values can u plz help me i am stuck.I tried by changing transistor BC557 by bc547 but not works is there any problem in Common anode display driving or in IC LM324 op amp? plz help asap to me cause doin this as my mini project
---------- Post added at 23:37 ---------- Previous post was at 23:14 ----------
which 3-4 components i have to replace or change to make uC (80c2051) based ultrasonic destance meter published in efy feb 2008 run? my mail id is
yog.kshirsagar@rediffmail.com
plz reply asap cause i have only 2days in my hand to make this work......
I have contacted them and they just say "We have tested the project in our lab and we have its working prototype" But the kit componenets are sorted and manufactured by associate company of EFY ie Kits n spares, and thus they just pack whatever the project requires. Thaz it. To submit a project to EFY, the author needs to send a prototype. Once the prototype is seen working, it is marketed as kit. Even i have seen the transformer which comes with the kits hardly gives out 100Ma whereas the kit requires a lot more than that. In some kist i worked were found ok when used 1A of better companies. The main culprit of the said kit is the firmware which is not upto expectations. If some one can re-write this in a better way, the project would be awsome.Have you tried contacting EFY directly if they are not replying here. https://electronicsforu.com/electronicsforu/Contact/
Use a magnifier glass to see the track side of the PCB supplied and you may find miniute shorts somewhere near the displays where the tracks are too near. Next you may try varying the preset where the flicker should stop and give a steady reading. Try replacing the Ultrasonic modules as those are inferior quality supplied by Kits n spares. Use better quality ones available at local kit dealers. Next replace the power transformer which has hardly 100Ma of current which will not suffice for the satifactory working of the kit. Use 1Amp for best performance.Hey guys, I also assembled 'ultrasonic distance meter' from EFY , but even random numbers does not appear on the display as it happened to yog007. It might be a hardware issue but i will assume it as a firmware until i test the hardware. Since i have no knowledge of assembly, a possible mistake could be occured during the copying process from the pdf file. If anyone has the .asm file of the project, could you please share it? (.hex file also works) Thanks.
Surprised to see that you have collections of old and obsolete projects Kits'n'Spares had dropped long time back! We would like to make some few comments here.
Electronic Auto Dipper - This was published in 1985. Selling of the kit has been already discontinued.
Water level controller - It was published in 1988. Selling of the kit has been discontinued.
If the kit was working fine, KNS or EFY would have introduced assembled and tested kits of the same for some extra price. One may have cross reffered your working kit to make theirs work.Microcontroller based heart rate meter - This project was working well but users have faced problem in making the T-tube contraption. So it has been discontinued.
Speed checker for highways - This project is still in stock with Kits'n'Spares. There is no problem with the kit. Most users exposed the LDRs to ambient lights and so the display show random number. Actually, LDRs should be covered in proper enclosures, such that leads are not exposed to ambient lights because they are light dependent resistors(LDR)! Only laser light beam should fall on them..
Secured digital system using iButton - This is still in stock with Kits'n'Spares. We agree that a socket for the iButton be supplied along with the kit. But we don't agree with the point that by shorting the leads of iButton you can open the lock. Here, a unique code of iButton is stored in the firmware/program. Unless you connect the data input terminal with iButton with same unique code as in the firmware, the lock will not open. Please try it again if the kit is still with you. If the lock is opened by shorting the leads, there is something wrong in your circuit connection...
Lastly, we have assembled kits/prototypes for all the projects for demonstration purposes. Some assembled kits are made available to Kits’n’Spares dealers. You can also request for assembled kits from them. However, selling assembled kits to students are discouraged. If students began to submit assembled kits to colleges, then what is left for them to learn? Kits’n’Spares provide components, then students assembled them, in the process atleast they learn something, troubleshoot the problem and make the project work. After all, solving problem is part of engineering!
Yes..i do agree 101% with you Sarma Sir. The particular kit "ultrasonic distance meter" will have one or the other flaw, may be in PCB or components, which makes it very difficult to debug. And these flaws are never the same for all kits. Every different kit will have different errors which makes debugging a real head ache. By the way efy has made me almost an expert, as i have managed to get all their kits working till date, and one kit which gave me maximum of 75 cms reading was the best ever kit i got. The video of the same is posted in the below link / attachment where a working prototype of the "ultrasonic distance meter" can be seen. The digits too can be seen varying as i vary the distance from the wall in front.i used to see a clause, if you have a problem , please contact us by mail, and if you are satisfied give us best ratingon ebay. if a face powder is found dangerous to you, we totally refund the cost , no consequential damages covered.
Likewise, the electronic magazines also. There is no point in discussing who is best. All these are in business, they make good money by ADs, Kits, publication. they boost the cost of kits. the print media "PRESS" has some facilities and they can influence the vested groups. the magazine publishers are no less.
Some mags publish articles around chips that belong to 2 to 3 decades before. we never get them. I am of the opinion that some mags publish sponcered projects in order to help blocked components sold as kits. Many projects, i fear, have issues, even though they claim that it was tested and certified. Some mags are careful to say that due to international variations , some parts may not be available.
finally in modern days, where the electronics and computer technology is growing leaps and bounds, most of these mags are lgging behind, still publishing articles around 555 and 741. I , with due respect agree thay are currently used. But there are much better devices.
I do agree that these kits can only help learn soldring skills, sorry .
I sincerely feel discussion on "the best mag" is relative to individuals and subect to their study levels. It is time we drop the topic.
we can just indicate so and so mag is available in market.
In India you get indian version of Elektor which are available in all book stalls. You may also subscribe to Elektor uk edision on the web but postage charges to India will be more than the magazine i guess..is there any outlet in India for it my pal
As an appreciation i have seen high quality PCB's for some kits from Kits n spares which is most welcomed. Keep it up and too would like to see improved quality not only in PCB's but also in all your kits too.You are most welcome to write your suggestions/feedbacks
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