Advanced Member level 5
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 firstname.lastname@example.org
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...!
Mods: Please move this discussion else where in case you think the thread is getting highjacked with a new topic.
Ah...Nice to have EFY lab in the forum. Welcome to EDA. My sugession is instead mailing privately to EFY, Santoshaxl and many others who have problems with EFY project may post the problems here in this forum, and may get replies from the publisher and these replies may be highly helpful for other future members who are too facing the same problems.
Infact i have noticed the PCB quality is best now as per today. But the layouts are the same. The layouts may be still improved to give a professional look. For example the resistors will never justify in the place given. The relay footprint on the "Electronic Auto Dipper" is given for a old relay but now a sugar cube relay is supplied which doesnt fit on the PCB and need to wire it outside. Electrolytics will need their legs to be spead wide to solder.
In the PCB of Automatic flush system, The values mentioned of resistors near the TSOP sensors are exchanged (10K in place of 220E and vice versa).
As i assume, the kits are supplied with componenets but never tested later once you have a prototype.
May i just request you to assemble a fresh new piece of "ultrasonic Distance meter" and post here what problems you get? If it works, fine i'll buy it for sure. I have 3 kits of the same which never worked. I would be happy if you could make them work for me. By the way there were 3-4 componenet level problems and i have found the flaws but expect you to experience them too. The components supplied in the kit never worked. those are replaced and the kit is working.
By curiousity i have bought and assembled a "Microcontroller based heart rate meter" which too never worked. While enquiring the Kits n spares dealer, they said the said kit is obselute and no more available. So what can be done with my non working kit?
The project speed checker for highways will never work unless the Biasing resistors of the LDRs are re calculated and installed with new values, and this value will be different in every kit depending on the dark resistance of the LDR supplied. An average student will not be able to debug such design flaws.
The "Secured i button lock" will energise the relay by just touching the two wires going to the Button. Thus no need of a firmware, and thus no security. Try it out. I have the same kit in the said condition. Error messages of long beeps are working ok. A socket for the button may have supplied iwth the kit.
Project "water level controller" uses 5 volts for digital circuits as well 12 volts for the relay. Thus 2 points on the PCB needs to be connected to two different sources of power. While kits are released, the same may have modified and a regulator of 7805 may have used on board and thus making the kit work with single power supply of 12 volts. Too here the relay supplied is the sugar cube and this too may have incorporated on the pCB itself for comapactness.
You may too supply assembled tested projects instead selling just unassembled ones. In some cases the company or the dealers may be blamed if the project doesnt work. In this case it may be a way out to prove that the project is working and may be some problems exist in assembling part.
Hope you'll improvise with these sugessions.