The NRF52840 ProMicrocompatible development board is a dropin alternative to ProMicro and is compatible with Nice! Nano form factor. Its pinout matches ProMicro, so it can be used with almost any ProMicro keyboard and related accessories. Power and efficiency 3.7V lithium battery interface for convenient lowpower projects Software switch to cut LED power, enabling tighter control of power use Standby current as low as 1 mA when powered down for energyefficient operation Wireless capability and performance performance, lowpower wireless SoC: nRF52840 Supports multiple wireless protocols: Bluetooth 5, Thread, Zigbee, ANT, and 2.4 GHz Processor: ARM CortexM4F running at 64 MHz Onboard memory: 1 MB Flash and 256 KB RAM Why this board stands out ProMicro compatibility with the Nice! Nano ecosystem provides an easy upgrade path for existing ProMicro projects Multiprotocol wireless support enables a wide range of wireless applications without extra radios Compact form factor and robust processing power ideal for embedded sensing and HID projects Power management features help extend battery life in portable or remote installations Key specifications at a glance Form factor: ProMicrocompatible pinout Battery interface: 3.7V Li battery Power management: LED power cutoff via software switch; standby current ≤ 1 mA when off SoC: nRF52840, ARM CortexM4F, 64 MHz Memory: 1 MB Flash, 256 KB RAM Wireless protocols: Bluetooth 5, Thread, Zigbee, ANT, 2.4 GHz Use scenarios Wireless keyboard or HID device: or upgrade a ProMicrobased keyboard with multiprotocol wireless capability while preserving the familiar form factor IoT sensor node: deploy temperature, humidity, or other sensors that communicate over BLE, Thread, or Zigbee in a compact, energyefficient package Smart home or BLE mesh network node: serve as a multiprotocol device within a Thread or Zigbee network, increasing network coverage and reliability This board delivers a practical upgrade path for ProMicro projects, combining familiar form factor and pin compatibility with the advanced wireless capabilities of the nRF52840, all while emphasizing power efficiency and flexible protocol support.