2pcs NRF52840 Development Board Compatible with Nice! Bluetooth Nano V2.0 charging

【NRF52840】SuperMini NRF52840 is a Pro Micro alternative development board that is compatible with Nice. Elder brother. Its pins are the same as the ProMicro, meaning it can be used with almost any ProMicro keyboard. The NRF5280 development board has a 3.7V lithium battery interface and a software switch that can cut off the power of the LED. When turned off, the standby power consumption can reach 1 mA. 【Compact Design】nRF52840 is a high-performance, low-power wireless SoC chip launched by Norwegian Nordic Semiconductor. It supports multiple wireless protocols, including Bluetooth 5, Thread, Zigbee, ANT and 2.4 GHz. The nRF52840 chip uses an ARM Cortex-M4F processor, clocked at 64MHz, with 1MB of built-in flash memory and 256KB of RAM. It also features a variety of peripherals, including ADC, PWM, SPI, I2C, UART, USB and GPIO, etc. 【Product parameters】Powerful wireless capabilities: Bluetooth 5.0, built-in antennaPowerful CPU: nRF52840 chip uses ARM Cortex-M4F processor, with frequency of 64MHz, built-in 1MB flash memory and 256KB RAMBattery charging chip: supports charging and discharging lithium batteryPower consumption: standby power consumption can reach 1mA. 【Power Supply】SuperMini NRF52840 supports charging and discharging a 3.7V lithium battery. The charging speed is 100mA when charging, so a 2000mAh battery takes 20 hours to fully charge. When BOOST is connected, the charging current increases from 100 mA to 300 mA and can only be connected when the capacitor capacity is greater than 500 mAh (to avoid explosion). 【External Battery】If you need an external battery, you only need to connect the + stage of the battery to B+ and the negative stage to B-. The external lithium battery only supports 3.7V and the charging speed is 100mA (a 2000mAh battery takes 20 hours to fully charge). Notice When soldering, be careful not to short-circuit the positive and negative poles, as this may burn the battery and equipment.