Microcontrollers

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The following is a rough guide, the reality is considerably more complicated.

Class Manufacturer Architecture Clock Wikipedia Notes
AVR Microchip (was Atmel) 8-bit AVR 1.6 to 32 MHz AVR microcontrollers ATmega328, ATtiny
PIC Microchip 8-bit to 32-bit PIC 0 to 200 MHz PIC microcontrollers
STM32 ST Micro 32-bit ARM Cortex-M0+ 0 to 48 MHz STM32 compatible: APM32 by Geehy Semiconductor
SAM Microchip (was Atmel) 32-bit ARM Cortex-M0+ 0 to 48 MHz Atmel ARM-based processors e.g. ATSAMD21G18
RP2040 Raspberry Pi 32-bit ARM Cortex-M0+ 0 to 48 MHz RP2040 Raspberry Pi Pico
ESP32 Espressif Systems 32-bit Xtensa LX6 / RISC-V 160 or 240 MHz ESP32 replaces ESP8266; integrated Wi-Fi and dual-mode Bluetooth
MSP430 Texas Instruments 16-bit MSP430 0 to 25 MHz TI MSP430 TI range
nRF Nordic Semiconductor 32-bit ARM Cortex 16 to 70 MHz Nordic Semiconductor e.g. nRF51, nRF52, nRF53, nRF91; nRF52833 used in the BBC µBits

Resources

Boards

Arduino

Arduino Board Wikipedia (Board) Arduino Docs Processor Wikipedia (Processor) Speed EEPROM SRAM
Arduino Nano Arduino Nano Nano ATmega328 ATmega328 16MHz 512bytes 2kB
Arduino Uno Arduino Uno UNO R3 ATmega328P ATmega328 16MHz 512bytes 2kB
Arduino Leonardo Arduino Leonardo ATmega32U4 AVR microcontrollers 16MHz 1kB 2.5kB
Arduino Mega Arduino Mega 2560 Rev3 ATmega2560 AVR microcontrollers 16MHz 4kB 8kB

Inventory

This is various stuff which I own.

Arduino Compatible

Quantity Board Compatible Processor Notes
5 Keywish Nano V3.0 Arduino Nano ATmega328P
3 ELEGOO Nano V3.0 Arduino Nano ATmega328P w/ CH340 USB to Serial chip
2 Lonely Binary Uno Arduino Uno ATmega328P w/ W5100 Ethernet Shield
1 ELEGOO MEGA2560 R3 Arduino Mega ATmega2560 w/ Arduino MEGA Prototype Shield v3

Raspberry Pi

Quantity Board Processor Notes
1 Raspberry Pi Zero RP2040 RP2040-Zero
1 Raspberry Pi Pico RP2040 Type-B-micro Green
1 Raspberry Pi Pico RP2040 Type-C Black
1 Raspberry Pi Pico RP2040 Type-C Purple
1 Raspberry Pi Pico RP2040 Collision Avoidance Robot (YouTube)
1 Raspberry Pi 4 Model B Rev 1.4 64-bit Broadcom BCM2711 'knowing'
1 Raspberry Pi 4 Model B Rev 1.5 64-bit Broadcom BCM2711 'glam'

ATtiny Processors

Quantity Processor
5 ATtiny13A
4 ATtiny45
4 ATtiny85

ATtiny Boards

Quantity Board Color Processor
1 Digispark Kickstarter ATtiny85 Development Board ATTINY85 blue ATtiny85
2 ATtiny88 Development Board ATtiny88

WeAct STM32 Boards

Quantity Board Color Processor Github
3 WeAct BlackPill STM32F411CEU6 F411 8M HSE STM32F411 WeActStudio.MiniSTM32F4x1
1 WeAct STM32G431CBU6 STM32G431CB WeActStudio.STM32G431CoreBoard

WeAct ESP32 Boards

Quantity Board Color Processor Github
2 WeAct ESP32-C3FH4 Core Board ESP32-C3 WeActStudio.ESP32C3CoreBoard
3 WeAct ESP32-C6 Core AN4 ESP32-C6-A-N4 ESP32-C6 WeActStudio.ESP32-C6-A
3 WeAct ESP32-C6 Core AN8 ESP32-C6-A-N8 ESP32-C6 WeActStudio.ESP32-C6-A

AliExpress Boards

Random stuff I got from AliExpress the branding of which is unclear.

Quantity Board Processor Wikipedia
1 ESP-12F WeMos D1 UNO R3 ESP8266 ESP8266

WeAct Studio Debuggers

Debugger Github
WeAct STLink STM32 Mini Debugger WeActStudio.MiniDebugger
WeAct DAPLink APM32 Mini Debugger WeActStudio.MiniDebugger

Programmers

Breakout Boards