ROS Robotics Projects - Second Edition

Comparison table

Let's look at a simple comparison of the preceding boards for quicker reference:

Content	Arduino Mega	STM32F103C8/T6	ESP8266	OpenCR	Arbotix Pro
Microcontroller	ATMega 2560	ARM Cortex-M3​	Tensilica L106 32-bit processor	STM32F746ZGT6 / 32-bit ARM Cortex®-M7 with FPU	STM32F103RE Cortex M3 32bit ARM
Operating Voltage	5V	2V ~ 3.6V	2.5V ~ 3.6V	5V	2V ~ 3.6V
Digital I/Os	54	37	16	8	16 ADC/GPIOs
PWM I/Os	15	12	-	6
Analog I/Os	16	10	1	6
Flash memory	256 KB	64 KB	External Flash (512 KB to 4 MB typically included)	2 MB	512 KB
Clock speed	16 MHz	72 MHz	24 MHz to 52 MHz	216 MHz	72 MHz

Comparison of preceding MCU boards

Now that we know the basics of microcontroller boards, let's look at single-board computers.