Software Serial Esp8266 Programming

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2018-6-24  I need to use ESP8266 standalone. Using Software serial on ESP8266 with Lua. LUA Programming,ESP8266 NODEMCU Serial communication. > Programming Questions > SoftwareSerial for. I know it's been a while but I'm trying to do the same and having a problem with the software serial.

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.

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SoftwareSerial library test for ESP8266 12E NodeMCU, this library allows our module to have 2 serial ports available for testing. GOAL From Arduino UNO, send AT commands to ESP8266 via a SoftwareSerial port and receive results. CURRENT STATUS I either send AT commands and get nothing back (wiring scheme 1) or I send AT com.

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. If it does not it may keep resetting and may not broadcast a signal. Arduinos cannot supply enough current and you should use a separate power supply. While experimenting I use a bread board power supply.

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I am using a simple serial in, serial out sketch. Hi Chris, You are correct, the ESP8266 can draw up to 300mA which is too much for the Arduino. My test projects were all done on a bread board and I used a bread board power supply which can be set to output either 5V or 3.3V.

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