Arduino ESP8266 WiFi Shield (ESP12-E) []

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====== Arduino ESP8266 WiFi Shield (ESP12-E) ======


===== Description =====
//source : https://www.instructables.com/id/ESP8266-ESP-12E-UART-Wireless-WIFI-Shield-TTL-Conv/ //

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  * **A (DIGITAL PINS)**: sequence of pins used by the Arduino.
  * **B (ESP8266 PINS)**: ESP8266-12E and their respective pins. On the back of the plate there is the nomenclature of the pins.
  * **C (EXTERNAL SERIAL USB ADAPTER CONNECTION)**: Pin sequence used to connect the external Serial USB adapter for firmware update or debugging of the ESP8266.
  * **D (SHIELD MAINTENANCE PINS)**: A three-pin sequence identified as Maintenance Only and used to verify that the voltage regulator is receiving and supplying the voltages correctly. IT SHOULD NOT BE USED AS A SUPPLY SOURCE.
  * **E (DIP SWITCH TO MODIFY OPERATING MODES)**: Four-way DIP switch to change operating modes.
    * **CONTACT 1 (P1) and CONTACT 2 (P2)**: used to connect the RX (represented by P1) and TX (represented by P2) of the ESP8266 to the Arduino D0 (RX) and D1 (TX) pins. P1 and P2 in OFF position disable the RX connection from ESP8266 to Arduino TX and TX from ESP8266 to Arduino RX.
    * **CONTACT 3 (P3) and CONTACT 4 (P4)**: used to enable and disable the firmware upgrade mode for ESP8266. To enable firmware write / load on ESP8266, P3 and P4 must be in the ON position. When P4 is in the ON position, the DFU LED will light, indicating that the ESP8266 is enabled to receive the firmware. To disable the firmware update mode and set the ESP8266 to normal operation, simply set P3 and P4 to OFF.
    * <WRAP center round info 60%>NOTE: All 4 contacts in the OFF position indicate that the ESP8266 is operating in normal mode next to the Arduino.</WRAP>
  * **F (AD8 FROM ESP8266)**: pin assignment for the ESP8266 ADC. A pin operating in the range of 0 to 1V and another pin operating in the range of 0 to 3.3V. These pins will only be used when using ESP8266 alone (standalone mode).
  * **G (ESP8266 RESET)**: button used to reset ESP8266. Whenever you change the position of the DIP switches, you must press the ESP-RST button.
  * **H (ANALOG PIN AND POWER SUPPLY)**: sequence of pins used by the Arduino.
==== This is a common ESP8266 Arduino shield with the following markings ====
<blockquote>
WiFi 2.4 GHz 802.11 b/g/n Designed in Beijing P.R.China \\
More info & tech support Please go to elecshop.ml \\
Arduino ESP8266 WiFi Shield Version 1.0 by WangTongze
</blockquote>


===== DIP Switches =====
^ Switch ^ Function ^
| SW1 | Connect ESP8266 TX to pin D0 |
| SW2 | Connect ESP8266 RX to pin D1 |
| SW3 | Enable bootloader mode |
| SW4 | Use DFU LED to show serial activity (?) |

===== Flashing ESP8266 =====
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NOTE: The PL2303 has 5V and 3V3 power. Use 3V3 power and ignore the 5V pin.
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  * ➯ https://medium.com/@manrick01/arduino-uno-esp8266-esp-12e-uart-wifi-wireless-shield-3a39858e5f25
  * ➯ https://www.instructables.com/id/ESP8266-ESP-12E-UART-Wireless-WIFI-Shield-TTL-Conv/

<WRAP center round info 60%>
Flashing ESP8266 & ESP32 under Linux : **esptool**.
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