Can ESP8266 use I2C?

ESP8266 chip does not have hardware I²C, so module uses software I²C driver. It can be set up on any GPIO pins including GPIO16 (see below). You have to call i2c. setup on a given I²C bus at least once before communicating to any device connected to that bus, otherwise you will get an error.

Does NodeMCU have I2C?

NodeMCU has I2C functionality support on its GPIO pins. So, do tests before using any GPIO for I2C applications.

What is en pin in ESP8266?

EN pin – The ESP8266 chip is enabled when EN pin is pulled HIGH. When pulled LOW the chip works at minimum power. RST pin – RST pin is used to reset the ESP8266 chip. WAKE pin – Wake pin is used to wake the chip from deep-sleep.

How many pins are in node MCU?

17 GPIO pins
GPIO Pins. ESP8266 NodeMCU has 17 GPIO pins which can be assigned to various functions such as I2C, I2S, UART, PWM, IR Remote Control, LED Light and Button programmatically. Each digital enabled GPIO can be configured to internal pull-up or pull-down, or set to high impedance.

How do you use I2C ESP32?

Use Different I2C Pins with ESP32 (change default I2C pins)

1. When using the ESP32 with the Arduino IDE, use the Wire.
2. First, define your new I2C pins on the I2C_SDA and I2C_SCL variables.
3. Create a new TwoWire instance.
4. In the setup(), initialize the I2C communication with the pins you’ve defined earlier.

How many I2C devices can be connected to NodeMCU?

It means that you can have up to 128 devices on the I2C bus since a 7bit number can be from 0 to 127. You can connect multiple I2C devices (often referred to as “I2C peripheral”) to a single I2C controller (a.k.a “I2C main”) using only two wires. All I2C addresses are either 7 bits or 10 bits.

Does ESP8266 have 5V output?

ESP8266 Pinout of WeMos D1 Mini The WeMos D1 Mini has a 3.3V and 5V output to power different external components. Both pins can provide up to 500mA and the 5V pin is also able to power the whole board with a supply voltage between 4V-6V. The WeMos has also all communication pins: 1x UART.

Does ESP8266 have analog pins?

Both ESP8266-12E and ESP8266-07 have one ADC pin that is easily accessible. This means that those ESP8266 boards can read analog signals. In this tutorial we’ll show you how to use analog reading with the ESP8266 using Arduino IDE, MicroPython or Lua firmware.

How many GPIO pins are there in ESP8266?

The ESP8266 has 17 GPIO pins (0-16), however, you can only use 11 of them, because 6 pins (GPIO 6 – 11) are used to connect the flash memory chip.

How many devices can connect to ESP8266?

The issue is that by default ESP8266 doesn’t allow more than 4 connections. There are a compile-time variable max_connections set to 4. Some say that this limit can be set to 8, but ESP8266 won’t support more sockets than 5.

What is the esp8266webserver library?

The ESP8266WebServer library allows you run an ESP8266 as a basic webserver and access point. This can process data received from a remote sensor over Wi-Fi without connecting the devices to a network or router. For this tutorial I’m using two NodeMCU boards from eBay but you can do this with any ESP8266 based board.

What is the power consumption of ESP8266 NodeMCU?

If you use the WiFi of the ESP8266 NodeMCU, the power consumption is the highest with 109mA for the version2 and 126mA for version 3 at the power supply of 5V. You can reduce the power consumption to 82mA and 81mA if you let the ESP8266 run in IDLE.

What are the WiFi at commands for ESP8266 module?

The WiFi AT Commands are useful in controlling the WiFi features of the ESP8266 Module like setting up the WiFi Mode of operation, get the list of WiFi Networks, connect to a WiFi Network, setup the Access Point (AP), control DHCP, WPS, MAC Address, IP Address etc. As per the official documentation, there are 40 WiFi AT Commands for ESP8266 Module.

How many analog inputs does the ESP8266 have?

Unfortunately, the ESP8266 has only 1 analog input A0 that is connected internally with a 10-bit analog-to-digital converter (ADC) to convert the analog voltage into 1024 digital values between 0 and 1023. The ESP8266 NodeMCU V2 has all communication standards on board: 2x UART 1x I2C