can someone explain a bit better how to use this TTL/uart function on wemos d1 r2?
i have an external device which should basically send data over 3,3volts uart port, but i have no idea how should i connect things...
so the device has 5v input!, Rx, Tx and Ground pins
which pins should i connect them on Wemos D1?
Does the device Rx go to Wemos Rx pin or Wemos Tx pin etc? like does it have to be like a crossover cable or just a normal straight cable? (aka Rx to Rx and Tx to Tx?) or why does someone cross them over then if they need to be 1:1?
if i could get this X-X part sorted out, then i can probably find the X pins on the Wemos myself(probably the only Rx and Tx pins on the IOL1 jumper?), but the thing is just so confusing when first starting up with things....
And the data transfer over these Rx and Tx pins work at 3,3 volts then, even if the device itself needs 5volts to power itself up? Like the input and data stream operate at 2 different voltages?