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ArangaNathan has posted another Fritzing diagram with the same errors as the opening diagram:

1. You can't drive the ESP8266 from the Arduino 3.3V pin as it can only supply 50mA but the ESP requires > 200mA to transmit properly.
2. All I/O wires between Arduino and ESP must be level shifted from 5V to 3.3V otherwise you will damage the ESP. It may not happen straight away, but it will happen.
3. If you wire Arduino Tx <-> ESP Tx and Arduino RX <-> ESP Rx you must remove the Arduino MCU chip completely before powering on, and use the Arduino IDE monitor to send commands to the ESP.
4. If you don't remove the MCU then you have to wire Arduino TX->RX and Arduino Rx<-TX.
5. If also you want to use the Arduino IDE in this mode (MCU installed) then you can't wire ESP TX/RX to D0/D1 and must use other pins instead (e.g. D2/D3) and SoftSerial to create another serial UART port.

ArangaNathan has posted another Fritzing diagram with the same errors as the opening diagram:

1. You can't drive the ESP8266 from the Arduino 3.3V pin as it can only supply 50mA but the ESP requires > 200mA to transmit properly.
2. All I/O wires between Arduino and ESP must be level shifted from 5V to 3.3V otherwise you will damage the ESP. It may not happen straight away, but it will happen.
3. If you wire Arduino Tx <-> ESP Tx and Arduino RX <-> ESP Rx you must remove the Arduino MCU chip completely before powering on, and use the Arduino IDE monitor to send commands to the ESP.
4. If you don't remove the MCU then you have to wire Arduino TX->RX and Arduino Rx<-TX.
5. If also you want to use the Arduino IDE in this mode (MCU installed) then you can't wire ESP TX/RX to D0/D1 and must use other pins instead (e.g. D2/D3) and SoftSerial to create another serial UART port.

ArangaNathan has posted another of Fritzing's diagram with same errors as the opening diagram.

1. You can't drive the ESP8266 from the Arduino 3.3V pin as it can only supply 50mA but the ESp requires > 200mA to transmit properly.
2. All I/O wires between Arduino and ESP must be level shifted from 5V to 3.3V otherwise you will damage the ESP. It may not happen straight away, but it will happen.
3. If you wire Arduino Tx <-> ESP Tx and Arduino RX <-> ESP Rx you must remove the Arduino MCU chip completely before powering on, and use the Arduino IDE monitor to send commands to the ESP.
4. if you don't remove the MCU then you have to wire Arduino TX->RX and Arduino Rx<-TX.
5. If also you want to use the arduino IDE in this mode (MCU installed) then you can't wire ESP TX/RX to D0/D1 and must use other pins instead (e.g. D2/D3) and SoftSerial to create another serial UART port.

ArangaNathan has posted another Fritzing diagram with the same errors as the opening diagram:

1. You can't drive the ESP8266 from the Arduino 3.3V pin as it can only supply 50mA but the ESP requires > 200mA to transmit properly.
2. All I/O wires between Arduino and ESP must be level shifted from 5V to 3.3V otherwise you will damage the ESP. It may not happen straight away, but it will happen.
3. If you wire Arduino Tx <-> ESP Tx and Arduino RX <-> ESP Rx you must remove the Arduino MCU chip completely before powering on, and use the Arduino IDE monitor to send commands to the ESP.
4. If you don't remove the MCU then you have to wire Arduino TX->RX and Arduino Rx<-TX.
5. If also you want to use the Arduino IDE in this mode (MCU installed) then you can't wire ESP TX/RX to D0/D1 and must use other pins instead (e.g. D2/D3) and SoftSerial to create another serial UART port.