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RX and TX Swapped on PCB

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stu1811 1 year ago

I'm trying to create my first board and I'm having problems with the RX and TX lines between the WEMOS D1 Mini and the TTL to 485 board. The schematic has RX<->TX and TX<->RX but the PCB shows TX<->TX and RX<->RX. Any idea how to fix this? ![image.png](//image.easyeda.com/pullimage/sCRRUgQB7ZsMb01AlfvZ67J5f84JXgI4PCAuecEW.png) ![image.png](//image.easyeda.com/pullimage/W0CLlwzGcuGhWe2mqBrOQdthNeTbf6TVXpy1Wbry.png) ![image.png](//image.easyeda.com/pullimage/aXzwyAfQz8sPoPhRFenif4aGqKAYcFUVEMnYDkqf.png)

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Comments

andyfierman 1 year ago

Check the pin mapping of the schematic symbol and tge pin to pad mapping of the PCB Footprint against the original manufacturer's datasheet. If necessary, edit them as described in the Tutorial.

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stu1811 1 year ago

@andyfierman This looks correct to me. I shared the project to make it easier. [https://oshwlab.com/stu1811/boiler](https://oshwlab.com/stu1811/boiler) ![image.png](//image.easyeda.com/pullimage/oF8zGJMJ6Nf0JJzgThkOfV9meLnXEm1yfwOVNWzM.png)

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stu1811 1 year ago

It's working fine now. Not sure what changed...

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andyfierman 1 year ago

I have no idea at all what is going on here. I just opened your project and got a schematic with 4 WEMOS D1 MINIs in it. Then I did F5 to reload the pages and now I have a single WEMOS D1 MINI which shows the same TX-TXD and RX-RXD connectivity in the schematic and the PCB. I think I'll just go back to solving the Riemann hypothesis using nothing but two spoons and a budgerigar.

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Markus_ee 1 year ago

Hi! I always suggest to place zero ohm resistor in series of the TX and RX datalines. Thus you can solder those resistors criss crossed if you have made the mistake of not swapping TX to RX and vice versa. Regards, Markus Virtanen HW / Electronics Designer

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