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Description
ProMicro NRF52840 Development Board Product Overview
The ProMicro NRF52840 Development Board is a high-performance, ultra-low-power microcontroller board based on the Nordic nRF52840 wireless SoC, designed as a seamless wireless upgrade for the Pro Micro ecosystem. Featuring the exact same pinout and form factor as the original Pro Micro, this board serves as a drop-in replacement for wired Pro Micro keyboards and Arduino projects. Powered by the nRF52840 chip with an ARM Cortex-M4F processor at 64MHz, 1MB Flash, and 256KB RAM, it supports Bluetooth 5.0, Thread, Zigbee, ANT, and 2.4GHz wireless protocols. Equipped with a 3.7V lithium battery charging circuit and Type-C USB interface, it consumes only 20μA in standby mode. It is widely used in custom wireless mechanical keyboards, IoT sensor nodes, wearables, and low-power wireless HID devices.
ProMicro NRF52840 Development Board Key Features
Nordic nRF52840 Flagship Wireless SoC: Powered by the Nordic nRF52840 chip with ARM Cortex-M4F processor at 64MHz, 1MB Flash, and 256KB RAM. Supports Bluetooth 5.0, Thread, Zigbee, ANT, and 2.4GHz wireless protocols. Features AES hardware encryption, SHA-256, and True Random Number Generator (TRNG).
Pro Micro Pin-Compatible: Features the exact same pinout and form factor as the original Pro Micro, enabling seamless wired-to-wireless upgrades without PCB redesign.
Ultra-Low Power & Power Management: Standby current of only 20μA. Onboard 3.7V lithium battery charging/discharging circuit with 100mA charge current, upgradeable to 300mA via BOOST jumper. Software switch can disable onboard LEDs, reducing active power consumption to approximately 1mA. External VCC control (P0.13) can cut power to 3.3V pins for further power savings.
Rich Hardware Peripherals: Integrated ADC, PWM, SPI, I2C, UART, USB 2.0, and GPIO. Type-C USB interface. Onboard antenna for stable Bluetooth connectivity.
Bootloader & Firmware Support: Built-in Nice! Nano V2.0 Bootloader. UF2 drag-and-drop programming support. Fully compatible with ZMK firmware.
ProMicro NRF52840 Development Board Applications
The ProMicro NRF52840 Development Board is widely used in:
Custom Wireless Mechanical Keyboards: As a drop-in replacement for Pro Micro, upgrading wired keyboards to Bluetooth 5.0 wireless.
IoT Sensor Nodes: Bluetooth 5.0, Zigbee, and Thread support for low-power wireless sensor networks.
Wearable Devices: Ultra-low power (20μA standby) and compact size (~33×18mm).
Wireless HID Devices: Wireless mice, presenters, game controllers.
Smart Home & Building Automation: Zigbee and Thread support for smart lighting and sensors.
Industrial Wireless Sensing & Asset Tracking.
ProMicro NRF52840 Development Board Key Advantages
Plug-and-Play Pro Micro Replacement: The ProMicro NRF52840 board features the exact same pinout as the original Pro Micro, enabling drop-in replacement without PCB redesign.
Flagship Wireless SoC Platform: Based on Nordic nRF52840, supporting Bluetooth 5.0, Thread, Zigbee, ANT, and 2.4GHz. 1MB Flash and 256KB RAM provide ample space.
20μA Ultra-Low Standby Power: Only 20μA standby current. Software power management reduces active consumption to ~1mA.
Integrated Battery Charging Management: Onboard 3.7V lithium battery charging circuit with Type-C charging. BOOST jumper upgrades charge current from 100mA to 300mA.
Convenient UF2 Drag-and-Drop Programming: Built-in Nice! Nano V2.0 Bootloader with UF2 drag-and-drop support.
Rich Open-Source Ecosystem: Fully compatible with ZMK firmware and Arduino development environment.
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FAQs:
1 What is the ProMicro NRF52840 development board
It is an ARM core board with a pinout identical to the ProMicro featuring the NRF52840 high performance low power wireless SoC supporting 2.4G Bluetooth and ZigBee wireless communication.
2 What are the core processor and specifications
It features an ARM Cortex M4F processor running at 64MHz with 1MB of Flash memory and 256KB of RAM providing ample storage for programs and data.
3 What wireless protocols does it support
It supports Bluetooth 5.0 Thread Zigbee ANT and 2.4GHz proprietary wireless protocols with an onboard high performance antenna meeting multi protocol IoT application needs.
4 How is the battery charging management function
It features a 3.7V lithium battery interface and a built in battery charging IC supporting charge and discharge management allowing direct battery connection for power supply.
5 What is the standby power consumption
It offers extremely low power consumption with an optimized standby current as low as approximately 20 microamps. A software switch can cut off LED power to further reduce energy consumption in deep sleep.
6 How is it compatible with Nice Nano V2.0
Its hardware pinout and system design are fully compatible with Nice Nano V2.0 allowing seamless replacement and integration into the custom keyboard firmware ecosystem.
7 What is the factory program and how to enter Bootloader
It comes pre loaded with the Blink-All-IO program which toggles all IO pins every second. To enter the bootloader for firmware flashing simply short the RST pin to GND twice within 0.5 seconds.
8 What applications is this board suitable for
It is highly suitable for DIY custom mechanical keyboard controllers especially wireless keyboards as well as portable low power IoT sensor nodes and wireless control devices.
9 What peripherals and development methods are supported
It supports ADC PWM SPI I2C UART USB and rich GPIO pins. The development environment supports mainstream platforms such as Arduino IDE Zephyr and nRF Connect SDK.
10 What onboard interfaces and physical buttons are there
It comes with a USB Type C port for power and flashing a physical reset button an LED status indicator and a software switch for disabling LED power along with mounting holes for easy installation.