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ARM Cortex-M3 32-bit STM32F103C8T6 Minimum System Development Board

Price range: $1.25 through $2.28
STM32F103C8T6 Minimum System Board STM32 ARM Core Module board is a low-cost Minimum System Development Board for ARM Microcontroller STM32F103C8T6 from ST microsystems. It connects with a Micro USB, so easily and simple programming interface with computer/laptop.
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ARM STM8S103F3P6 8-Bit Minimum System STM8S Development Board

$0.85
STM8S103F3P6 minimum system board STM8S STM8 development board core board
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Digispark Rev.3 Kickstarter with ATTiny85 and USB compatible with Arduino

$2.18
Digispark ATTiny85 is probably the most compact and smallest microcontroller currently available.
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DUE R3 SAM3X8E 32-bit ARM Cortex-M3 with Arduino logo

Price range: $24.89 through $25.04
Due is a microcontroller board based on the Atmel SAM3X8E ARM Cortex-M3 CPU.
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ESP32 D1 Mini NodeMCU WiFi Module + Bluetooth Internet Development Board Compatible with Arduino

$3.76
ESP32 D1 Mini development kit with ESP-WROOM-32
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ESP32 Dev Kit C DEVELOPMENT KIT ESP32-DEVKITC-32D

$3.39
100% compatible with Espressif, combines a CPU with 2 Tensilica LX6 cores, clocked at up to 240 MHz, and 512 kiloBytes of SRAM in a single microcontroller. It also integrates a radio unit for WLAN (according to 802.11b/g/n) and Bluetooth (Classic and BLE).
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ESP32 LoRa with OLED display 868-915Mhz 433-470MHz HELTEC SX1276 SX1278 Development Board compatible with Arduino

Price range: $15.68 through $16.79
ESP32 (dual-core 32-bit MCU + ULP core), with LoRa node chip SX1276/SX1278; and a 0.96''' OLED display.
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ESP32 Module with Adapter Board for Raspberry Pi and Microcontrollers

$1.94
ESP32 ESP-WROOM-32 with Breadboard Adapter
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ESP32 NodeMCU DEVKIT V1 CP2102 WiFi Development Board 30-pin

Price range: $3.11 through $3.18
The ESP32 Dev Kit is an Arduino compatible Wifi/Bluetooth board. In addition to the 802.11 b/g/n WLAN, the BLE (Bluetooth Low Energy) function enables maximum connectivity with the outside world.
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ESP32 NODEMCU Module WiFi Development Board with CP2102 Compatible with Arduino 38-Pin

$3.25
Thhis module has 38 pins and offers more functions than a 30-pin module. And it is smaller and more convenient to use.
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ESP32-Cam module (ESP32 Wifi/Bluetooth module including camera) compatible with Arduino

Price range: $5.40 through $5.92
The ESP32-CAM has a very competitive small-size camera module that can operate independently as a minimum system, measuring only 27*40.5*4.5mm, with deep sleep current and a minimum of 6mA.
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ESP8266 ESP-01S ESP01S WiFi module

Price range: $0.87 through $1.47
This is WiFi serial transceiver module, based on ESP8266 SoC which has integrated TCP/IP protocol stack.
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ESP8266 ESP-12F ESP-12E WIFI module with Adapter Board for Raspberry Pi and microcontrollers

$1.12
ESP-12F ESP-12E WIFI module with Breadboard Adapter for Raspberry Pi and microcontrollers
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ESP8266 OLED WiFi Development Board 0.91” OLED Display CP2102 Support Arduino IDE ESP8266 NodeMCU LUA

$9.43
WiFi Kit 8 is a classic IoT dev-board, it's a highly integrated product based on ESP8266 (Wi-Fi), Li-Po battery management system, 0.91″ OLED is also included. It's the best choice for smart cities, smart farms, smart homes, and IoT makers.
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Leonardo R3 Atmega32u4 Development Board Arduino Compatible

Price range: $4.20 through $4.34
Leonardo R3 ATmega32U4 has an integrated USB controller. This board is fully compatible with Arduino.
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Mega 2560 R3 CH340 Development Board

Price range: $8.76 through $8.91
ATMEGA2560 Board with CH340 replacing ATMEGA16u2 as the USB chip
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Mega 2560 R3 Development Board

Price range: $10.46 through $10.60
Mega 2560 R3 with ATmega16u2 USB chip fully compatible with Arduino
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Mega WiFi R3 ATmega2560 ESP8266 CH340G Compatible with Arduino NodeMCU WeMos

Price range: $10.04 through $10.21
Full integration on one board: Mega R3 ATmega2560 and WiFi ESP8266 with memory 4 Mt bytes (32Mt bit). All of the modules can work together or each separately. And everyone has their own pinout headers.
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Mega2560 Pro CH340G Arduino Compatible

$7.88
The embedded version of Mega 2560 CH340G/ATmega2560 - compatible with Arduino
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Nano V3.0 CH340 Development Board

Price range: $1.84 through $2.09
Nano V3.0 CH340G Replaces FT232RL as the USB chip
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