Hi Blutbad3, Sorry but you need to provide more information about your circuit before any realistic judgements can be made about how likely it is to be functional. A design specification and some sort of "How it works" document would be helpful. In the meanwhile, here are some things to consider. * The layout around U6, CN2 and the relays makes your schematic hard to read. * The LEDs are wired back to front. * You have no power supply decoupling. Please read the manufacturer's datasheets for advice on power supply decoupling for the 8051. * What voltages will there be on the relay contacts? is there enough creepage and clearance distance around and between the pins for the voltages they may carry? * Do you need high voltage warnings on the PCB for the switched contacts? * What currents will there be through the relay contacts? Are the switched side traces wide enough for the currents they may carry? * The PCB layout looks to not have enough power supply tracking width and the supply routing is not well laid out. Please read the manufacturer's datasheets for advice on power supply layout for the 8051. * Also for the ULN2003. * The relay coil traces look a bit skinny too. * Consider using copper areas for positive and ground supply connections instead of simple tracking. For examples of this see: https://easyeda.com/example/Automotive_12V_to_USB_5V_2A_output_power_adapter_-L1xrlfxrJ https://easyeda.com/example/Tesseract_Guitar_Practice_Amp-MjP71jBni https://easyeda.com/andyfierman/Bob_Peases_High_Impedance_Active_Scope_Probe_PCB_Design-g2QNnljhf https://easyeda.com/example/The_EasyEDA_Commodore_64_Computer_Saver_PSU_overvoltage_protection_circuit-bS4ECcMXV https://easyeda.com/example/The_EasyEDA_Precision_Commodore_64_Computer_Saver_PSU_overvoltage_protection_circuit-G3pLJ5Paw * With due respect I think you might find it useful to read this: http://michaelhleonard.com/how-to-design-the-perfect-pcb-part2/ which will give you some tips on good schematic drawing and layout practices. It will also give you a little guidance on PCB layout. * Do you really need such a large PCB? There's an awful lot of wasted space on it. * Do you really want just the one rounded corner on your PCB? :)

thank you so much for appreciate this.

@andyfierman thank you so much for this. i really do appreciate.

All part of trying to bring our users an Easier EDA experience. If you need more help, post back and we'll try to assist. :)

@andyfierman The project aims at a system allowing user to control home based appliances through Sms along with acknowledgements. Here user need not switch home appliances on and off manually. The system allows user to operate these devices through sms, also the status whether the device is switched on or not is sent to user via a return sms. This can be used by domestic users and company users to operate as well as check status of home and company appliances from anywhere in the world. It is a very convenient system for users since it allows them to easily control and monitor these appliances from anywhere. An example is that a person may switch on his House or office AC 15 minutes before he arrives so that he gets a cool environment as soon as he reaches there. The system works in the following manner, the sms sent by user is received by the Gsm receiver and then sent to an 8051 microcontroller in order to process it. The microcontroller then activates the appropriate relay for that appliance and controls it. User may also send an query sms in order to just get the status of an appliance. The query sms is returned to user with the status of that particular appliance. Also user may see all appliance status on an LCD display.@andyfierman

Your explanation is all well and good but it tells people nothing about the schematic that you have actually asked for help on which basically contains an 8051, a ULN2003 and three relays. All it describes is a wish list of what you want it to do and talks about a load of stuff that is not shown here in EasyEDA. You need to be describing things like the supply voltages - and their tolerances - coming in to the PCB, what voltages and currents will be applied to the relay contacts, what's the 8051 clock frequency, control signals coming in, logic levels, edge speeds, maximum prfs and /or pulse widths, expected operating temperature of the PCB, what EMC requirements you have to meet and so on. I assume that this is (a) going to be used to control mains voltages and (b) is going into a product that will be sold to the public on may be sold as a kit to the public. If either of thos things are true then you must put a great deal more effort into specifying what you are doing and into designing it for safety. :)

thanks for the best honest reply ever, let me get into it. i'm designing the circuit as a final year college project.

Hi Blutbad3, Just telling it like it is. :) All the stuff I have talked about is what you will have to do if you work in engineering in the real world. :o

@andyfierman i just finished remodeling the schematics and the PCB layout. check it out please at your convenience https://easyeda.com/blutbad3/EMS_blutbad3-CqkBTNHnF. i cant seem to identify the errors!

* No design spec or 'How it works' description for what's in the schematic. * No information about relay swithced voltages and any possible high voltage hazard. * You still have no supply decoupling across the 5V to the 8051 or the 12V to the ULN2003. * Nets drawn across the body of U6 in the schematic. Make the canvas bigger if you need more space: See: https://easyeda.com/forum/topic/Canvas_size-eOI0UcuLF and answer to Rajamim in: https://easyeda.com/forum/topic/Ruler_scale_in_mm-YZvNHZhbt * Power traces unnecessarily thin. * D4 cathode has no join dot. Check that it is connected. * You have many DRC errors. Go to the top of the right hand panel in the PCB editor. Click on **Design Manager**. Scroll down to **DRC Errors** Click **Refresh**. Click on each error in turn to highlight it on the PCB. Fix it. Move to the next one. See: https://easyeda.com/forum/topic/How_to_Check_DRC_Errors_Using_Easyeda_-t3Xf8qI0U and https://easyeda.com/forum/topic/how_do_I_run_DRC_-D6igsqZXL