Following on from the post, if you do not have a FTDI serial adaptor you can use an Arduino. Here is how to set up the Arduino to talk to the ESP8266. I an using a 5V Arduino Nano which of course is 5V. Kumpulan Soal Spa Polines Teknik on this page.

The Esp8266 is a 3.3v device and so I am using a voltage divider to bring the Arduinos 5V down to 3.3v. If you are using a 3.3v Arduino then you do not need the voltage divider. The wiring is very similar to the FTDI. Arduino pin 3 to voltage divider and then to ESP8266 RX Arduino pin 2 to ESP8266 TX Arduino GND to ESP8266 GND Pull CH_PD HIGH with a 10K resistor to +3.3v +3.3V to vcc You only need the voltage divider on the Arduino TX pin. The 5V Arduino will read 3.3v as HIGH so you can connect the ESP8266 TX pin directly to the Arduino RX pin. Make sure the ESP8266 has enough current. Download Free Body Pump Routine Pdf Printer here.