<code>
+----------------------------+
| FTDI Board DTR |
| RX |
| U TX |
| S VCC |
| B CTS |
| GND |
+----------------------------+
+----------------------------+
| ESP8266 ESP-01 |
| RXD VCC |
| GPIO0 RST |
| component GPIO2 CH_PD|
| side GND TXD |
| |
+----------------------------+
GND <-> GND
VCC <-> VCC
RX <-> RXD
TX <-> TXD
CH_PD pullup nach VCC
GPIO0 pull to GND for firmware flash
</code>