ESP8266 serial ESP-01 WIFI Wireless Transceiver Module - IOT

Product Description:

        ESP8266 usually comes assembled on a board, the most popular ones having been the ESP-NN. The boards integrate an ESP8266 chip plus a Flash memory chip (Flash RAM), a crystal, and usually on on-board WiFi antenna. The Flash RAM size and chip model can vary.
         Among the ESP-XX boards, the most notable to get started is the ESP-01, which has a male 2×4 0.1“ pitch connector that can be readily used with Dupont wires. This board exposes serial communication pins (RX/TX), and the minimal 4 control pins, GPIO0, GPIO2, CH_PD and ReSeT, plus VCC and GND of course. With this board you will have very limited access to all-purpose GPIOs. It also has an on-PCB Wifi Antenna etched on the PCB, which has sufficient gain for shorter range applications. Note that the ESP-01 connector on its own cannot straddle the two sides of a standard breadboard.
        The other ESP-NN modules expose more GPIO pins, but are packaged in SMT packages, at best with a 2mm-pitch notches. Some modules have etched antenna, some have ceramic antenna, and some have just a socket or a pin. A favorite for that is the ESP-07, which has a shield (with FCC marking, but probably not registered at FCC)
!:Caution: The first and most important thing to note – especially for Arduino developers – is that ESP8266 chip only uses 3.3V for power and I/O. If you attempt to connect directly to 5V devices then at best this may simply not work and at worst this will cause permanent or fatal damage to the chip.
        When getting to know and use this device, the best approach is to use a USB to 3.3V TTL converter and a 3.3v power supply. Avoid working with any devices that require or output 5V levels. Get everything working and talking first.
        Once you have done this then consider how to connect any 5V devices and interfaces if you must. You will need to implement level shifting to connect to 5V devices. There are plenty of resources on the internet (for example (1), (2)) that will help you do this, and also low cost modules such as by-directional level shifters that are available for a few $, Also be aware of the difference between unbuffered interfaces (such as I2C) and buffered ones (such as SPI) as the level shifting approach is different for these.
        Also note that if you use an external power supply, then be sure to connect its ground to your USB TTL's ground, otherwise it may have trouble.

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1*ESP8266 serial ESP-01 WIFI Wireless Transceiver Module - IOT

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ESP8266 serial ESP-01 WIFI Wireless Transceiver Module - IOT

  • Product Code: ESP-01
  • Availability: 50
  • 199

  • Ex Tax: 199