The DFRobot BLE 4.1 Module is a newly developed Bluetooth 4.1 transmission module. It follows the same usage as Bluno but adds star network function and KISS connection (Approach Connection). Built on BLE 4.1 technology, it features low power consumption. In BLE transmission, its point - to - point output rate is 4Kbps, double that of the original Bluno. It uses the DA14681 high - performance BLE chip with an advanced power management system and a 3.7V lithium battery charging circuit. It can get power directly from the USB port and supports a maximum charge current of 400mA. It supports BLE 4.1 master - slave switch, Bluetooth serial data transmission, point - to - point wireless programming, multi - device cascade (up to 4), Arduino Bluetooth library, low - power - consumption Bluetooth, two - way interrupt wake - up, KISS connection, firmware update, lithium - battery power, and USB charging. It also has an LED status indicator. With a processor of DA14681 (ARM Cortex - M0 CPU), it operates at 3.3V, supports various network connection modes, and has multiple specifications like different memory sizes, I/O ports, and interfaces.
Using the DFRobot BLE 4.1 Module is easy. First, connect it to your device. You can power it directly from a USB port or use a 3.7V lithium battery. If you're charging the battery, make sure the input voltage is between 4.2V and 5.0V and the charging current is within 10mA to 400mA. When using Bluetooth functions, it can switch between master and slave modes, allowing you to connect multiple devices up to 4 at the same time. For programming, you can use the Bluetooth serial data transmission or point - to - point wireless programming. Remember, it has low power consumption, so it's great for long - term use. But don't expose it to extreme temperatures outside the range of - 40℃ to +85℃. To maintain it, keep it clean and avoid physical damage. If you need to update the firmware, follow the instructions in the product wiki.
