Any images?

Hi, I can't upload a picture, it says it's allowed with jpg but I get error message. The link to the project: [https://easyeda.com/Thomas_hp/wifi-temp-with-oled](https://easyeda.com/Thomas_hp/wifi-temp-with-oled) Can't you open this?  

@Thomas_hp, What you are seeing in the PCB Editor are the "Ratlines" or "Airlines" that show which nodes (pads) are connected to the same net. They show just the connectivity and have no relationship to the route the wires take in the schematic. As you move a footprint in the PCB Editor, the Ratlines will always show the shortest route between connected pads so although they may appear to jump around randomly in fact they do not. The way they move about is to help you place the device footprints so that, as far as possible, they are grouped together where they need to be and the connections are as short and direct as possible. For some useful background on the relationship between the Schematic and the PCB layout you might like to read: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f) especially, (2.2), (4) and (6). Please note that in the schematic, the green "Not Connected" crosses are to tell the Editors that a pin on a Schematic Symbol (or pad on a PCB Footprint) is deliberately left unconnected so it does not flag up a disconnected pin DRC error in the Design Manager. Where wires cross in the schematic Editor, they do not join:  so you do not need to place them where wires cross without joining:  Where wires join to form a three or more way junction, the Schematic Editor shows a red join dot: 

Hello. In the drawing I connect SCL and SDA from Oled to D8 (gpio15) and D7 (gpio13), but Ratlines shows something completely different. And I'm not allowed to put it where it should. It is also not possible to put on a pair of extra pad to then draw a track from example D0-D4 up on the top of the card as an additional connection for other equipment. If I turn off the routing conflict, it can connect the devices properly and any extra pad / holes  

@Thomas_hp, I'm sorry but I have no idea what you have done to your PCB layout. The connectivity of the PCB bears very little relationship to that of your schematic. For example you have a connection between pins 1 and 30 that is not in the If I copy your schematic and then do **Convert to PCB...** I get a default board outline with all the components laid out below it and with all the ratlines showing that the pads are connected as shown in your schematic. Here's a screen shot with a very rough placement similar to yours where you can see that the connectivity is OK:  Note that where the little hand cursor is, there is no connection between pin 1 and 30. I suggest that you either do **Update PCB...** from the schematic or **Import Changes...** from the PCB which should reset the connectivity to that of the schematic or simply throw your PCB away and start again from **Convert to PCB...** Note that when you update the PCB, you may lose the 4 mounting holes that you have placed. For more on this please read (4) in: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f)

Oops, typo: "For example you have a connection between pins 1 and 30 that is not in the **schematic**"

You will also have to Unroute All:  because you have routed copper tracks that are incorrectly connected.

This looks nothing like the schematic....  

In my schematic, bottom pin on the sensor to the right i GND and no connection to others. Convert to pcb It comes with connection to Resistor.... Top pin of the sensor i also Connect to ground in pcb layout.. this is not correct, is it something i dont get here ??

@Thomas_hp, "is it something i dont get here ??" Yes. You have not understood that the Schematic Symbol for a device is not intended to represent the physical part so the Schematic Symbol does not have to look like - or have the pins in the same physical positions as - the PCB Footprint. There is no reason why it should because a schematic is not a physical representation of the PCB that is created from it. The outline and pin placements of a Schematic Symbol are there to assist in the clarity and readability of a schematic. The PCB Footprint is the physical representation of a device on a PCB. Therefore the outline should match the shape and maximum external dimensions of the part and the pad locations must match the locations of the pins on the physical device and the dimensions specified in the device datasheet. A Schematic Symbol must include all pins that have to be connected but does not have to show pins that are not connected (NC) on the physical device. They also do not have to show multiple pins that are connected to the same device function. For example, the Schematic Symbol for an NPN transistor, however, bears no resemblance to the physical device. The Schematic Symbol for an NPN power transistor in a non-isolated TO-220 package has 3 pins, just like any other NPN transistor. Suppose the pins on the Schematic Symbol are numbered: 1= Base; 2 = Collector; 3 = Emitter; The physical device has both the middle lead and the metal tab connected to the collector so the PCB Footprint representing the horizontal PCB mounting of this device has 4 pads but the pads for the centre lead and the tab can both be numbered as 2 so that the single collector pin on the Schematic Symbol maps onto both pins on the PCB Footprint. The Schematic Symbol must have the Package attribute set to the correct PCB Footprint for the chosen device but the single thing that ties the pads on that PCB Footprint to the pins on the Schematic Symbol that is calling that package into the PCB is the numbering. So, the pin numbering of the Schematic Symbol must match the pad numbering of the PCB Footprint.

@Thomas_hp, You also need to wire all ground pins together in the schematic and include a power supply input connector of some sort. You should probably also add about 10uF decoupling capacitance across the VCC and GND pins of this connector. See this project to understand why: [https://easyeda\.com/andyfierman/Power\_supply\_decoupling\_and\_why\_it\_matters\_\-451e18a0d36b4f208394b2a2ff7642c9](https://easyeda.com/andyfierman/Power_supply_decoupling_and_why_it_matters_-451e18a0d36b4f208394b2a2ff7642c9)

This was not easy .. Very much appreciate the answers I get..And feel very stupid when I ask. You say in your previous answer where you are trying and generating the pcb that the links are ok. If I look at Ratlines (which is where the copper track goes to the different components?) So no components get power, no one is connected to 3v. The Temp sensor is connected with gnd on 2 pins, the Oled screen is connected to GND on the VCC. I'm going to have a power contact somewhere yes, don't know which one yet. I have a micro usb charger (5v) which i consider and use. This should then be connected to VIN - GND which I understand that on this card it then gives out 3v on the 3v pins. The form shows exactly how this should be connected to work, so don't understand why pcb doesn't have to look the same. This is the guide i have used : [https://www.14core.com/wiring-dht11-dht22-with-oled-screen-on-esp8266-12e/](https://www.14core.com/wiring-dht11-dht22-with-oled-screen-on-esp8266-12e/) 

"The form shows exactly how this should be connected to work, so don't understand why pcb doesn't have to look the same." What do you mean by "form"? Your image above and the link: [https://www.14core.com/wiring-dht11-dht22-with-oled-screen-on-esp8266-12e/](https://www.14core.com/wiring-dht11-dht22-with-oled-screen-on-esp8266-12e/) is an incomplete wiring diagram. It does not show any sort of power supply input connector or even where it should be connected to. You have to understand the difference between a wiring diagram, a circuit diagram and a schematic and from there the relationship between a schematic and a PCB. As advised in my first reply above, please read (2.2), (4), (5) and (6) in: [https://easyeda\.com/andyfierman/Welcome\_to\_EasyEDA\-31e1288f882e49e582699b8eb7fe9b1f](https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f) Also, your link does not provide enough information about the devices in the wiring diagram. For more help on this project you will need to supply links to detailed datasheets for the devices used including pin descriptions and power supply requirements.

The person in the link is using the Micro USB on the Card for power. This is not recomended som i will use Additional power conector :-) i will read one more time ;-) maybe iam not good to explain myselfe what i dont get :-/ thanks for the hjelp :D

Why not do what the Welcome to EasyEDA document advises and start with a really simple project to learn how to drive the tool and to get a feel for how Schematic Capture and PCB Layout work together before you launch into a more complicated (and in this case very poorly documented by the original designers) project? :)