The Arduino Nano does not have Bluetooth or Wifi by default. It idles at ~170 mW of power and cannot be started immediately (It has to boot up, which can take about 30 seconds). All this comes at a cost however, the Pi Zero W requires a 5V, 2A power supply which means it can chew through even a large battery pretty quickly. It can even run implement machine learning in a limited fashion. The Zero W can run a full version of Linux and by extension, Python. The processing power of the Pi Zero can be put to good use if the data needs to be 'processed' locally instead of just being sent to the cloud. Needless to say this is probably overkill for most IoT based projects. The Raspberry Pi Zero W has a Broadcom BCM2835 SoC which runs at a stock clock speed of 1 GHz and has 512 MB of RAM. Hardware Specifications of Raspberry Pi Zero, Arduino Nano and NodeMCU NodeMCU ESP8266 is the most popular Wi-Fi module to be used to make Iot applications, here are some NodeMCU based practical applications. The SPI bus allows for simple, high speed interfacing of sensors while I2C allows 100s of sensors to be connected using only two wires! It costs around $8- $10 in retail.Īll the three boards support SPI (Serial Peripheral Interface) and I2C (Inter IC) Bus. ![]() The NodeMCU has 11 usable digital (9 if two pins are used as TX/RX) and only 1 analog pin, although here it is worth noting that the single analog pin can be multiplexed and several sensors can be connected with it. The Arduino has very extensive library support for almost all sensors, so interfacing anything is just a matter of looking it up on the web.Ĭheck here how a Arduino can be used to make Iot projects. $22 is the cost for the official board, while Chinese clones/knockoffs that perform just as well can be had for as little as $4. The pins are 5V so 3.3V sensors may not work depending on the sensor. The Nano has 22 pins, which includes 14 digital pins (6 of which provide PWM) and 8 analog pins. Since almost all Arduino boards use the same microcontrollers (ATMEGA 328P) and are programmed the same way, the Arduino Nano is taken here for comparison. We previously done many Iot based Raspberry Pi Projects. ![]() The $5 cost is also misleading, as it is hard to find the board retailing for $5 and the fact that the board is practically useless without a microSD card. Although 3.3V sensors are becoming more common, there are still plenty of 5V sensors around. The pins are 3.3V tolerant, which rules out 5V sensors being used unless logic level shifters are used. ![]() For sensors requiring analog I/O an external ADC will have to be used with the Pi, alternatively one can use the GPIO pins as PWM. The Pi's 40 GPIO pins at first glance may seem to be a lot, but this is offset by the fact that the Pi does not have any analog pins. The Raspberry Pi Zero W is the largest of the three boards which is no surprise since it is a complete computer on a chip. Overview and Pinouts of Raspberry Pi Zero vs Arduino Nano vs NodeMCUĤ0 pins ( 28 of which are GPIO, 12 for power)Ģ2 pins (14 digital with 6 PWM and 8 Analog)
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