Blip
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Blip is a development board for Bluetooth Low Energy (BLE) and 802.15.4 based wireless applications, based on the Nordic Semiconductor nRF52840 SoC. It has a Black Magic Probe compatible programmer and debugger built in, along with temperature/humidity sensor, ambient light intensity sensor, and a 3-axis accelerometer. It can be used to prototype very low power devices. It also has provision for an SD card slot, which makes it a complete and versatile development board.