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Digital I/O with PWM (pins) Analog input (pins) Analog output pins Arduino Nano ESP32 [3] u-blox NORA-W106 (ESP32-S3) up to 240 MHz minimal 45 mm × 18 mm [ 1.8 in × 0.7 in ] USB-C 3.3 V 16MB 384 512 14 5 8 Arduino Uno WiFi rev 2 [4] ATMEGA4809, NINA-W132 Wi-Fi module from u-blox, ECC608 crypto device 16 MHz Arduino / Genuino
ESP32 is a series of low-cost, low-power system-on-chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth.The ESP32 series employs either a Tensilica Xtensa LX6 microprocessor in both dual-core and single-core variations, an Xtensa LX7 dual-core microprocessor, or a single-core RISC-V microprocessor and includes built-in antenna switches, RF balun, power amplifier, low-noise ...
Digital I/O with PWM (pins) Analog input (pins) Analog output pins Arduino / Genuino MKR1000 Arduino Yes ATSAMW25 (made of SAMD21 Cortex-M0+ 32 bit ARM MCU, WINC1500 2.4 GHz 802.11 b/g/n Wi-Fi, and ECC508 crypto device ) 48 MHz minimal 61.5 mm x 25 mm USB 3.3 V 256 No 32 8 12 7 1 Announced: April 2, 2016 Arduino 101 [1] Genuino 101. Arduino Yes
A GPIO pin's state may be exposed to the software developer through one of a number of different interfaces, such as a memory-mapped I/O peripheral, or through dedicated IO port instructions. Some GPIOs have 5 V tolerant inputs: even when the device has a low supply voltage (such as 2 V), the device can accept 5 V without damage.
This may occur when the device uses a different instruction set, or if the device has a multiplexer attached to a pin (which, for example, may allow the switching of the pin between being driven as GPIO or by an A/D) and that multiplexer selects, by default, a different input source than is selected on the device being replaced.
A minimal Arduino C/C++ program consists of only two functions: [73] setup(): This function is called once when a sketch starts after power-up or reset. It is used to initialize variables, input and output pin modes, and other libraries needed in the sketch. It is analogous to the function main(). [74]
While Arm is a fabless semiconductor company (it does not manufacture or sell its own chips), it licenses the ARM architecture family design to a variety of companies. Those companies in turn sell billions of ARM-based chips per year—12 billion ARM-based chips shipped in 2014, [1] about 24 billion ARM-based chips shipped in 2020, [2] some of those are popular chips in their own right.
NodeMCU was created shortly after the ESP8266 came out. On December 30, 2013, Espressif Systems [6] began production of the ESP8266. [12] NodeMCU started on 13 Oct 2014, when Hong committed the first file of nodemcu-firmware to GitHub. [13]