![]() You can use the preceding links or go directly to /tools to find all the parts for your projects at the best price! ESP32 DOIT DEVKIT V1 Board (read Best ESP32 development boards).Here’s a list of the parts required to follow this project: This ESP32 is connected to an OLED display and it prints the latest readings. The ESP32 client connects to the BLE server and it is notified of its temperature and humidity characteristic values. The ESP32 BLE server is connected to a BME280 sensor and it updates its temperature and humidity characteristic values every 30 seconds. One ESP32 is going to be the BLE server, and the other ESP32 will be the BLE client. In this tutorial, you’re going to learn how to make a BLE connection between two ESP32 boards. Getting Started with ESP32 Bluetooth Low Energy (BLE) on Arduino IDE.For example, it can identify a particular service provided by a Bluetooth device.įor a more detailed introduction about BLE, read our getting started guide: In summary, the UUID is used for uniquely identifying information. There are shortened UUIDs for all types, services, and profiles specified in the SIG (Bluetooth Special Interest Group).īut if your application needs its own UUID, you can generate it using this UUID generator website. A UUID is a unique 128-bit (16 bytes) number. UUIDĮach service, characteristic, and descriptor have a UUID (Universally Unique Identifier). Each characteristic has the notify property, so that it notifies the client whenever the values change. The actual temperature and humidity readings are saved on the value under their characteristics. One for the temperature and another for the humidity. In our example, we’ll create a service with two characteristics. For example: read, write, notify, broadcast, indicate, etc. Properties: describe how the characteristic value can be interacted with. ![]() Characteristic: it is where the actual data is saved on the hierarchy ( value).Service: collection of related information, like sensor readings, battery level, heart rate, etc.Profile: standard collection of services for a specific use case.This is called point-to-point communication. The client scans the nearby devices, and when it finds the server it is looking for, it establishes a connection and listens for incoming data. The server advertises its existence, so it can be found by other devices and contains data that the client can read. The ESP32 can act either as a client or as a server. With Bluetooth Low Energy, there are two types of devices: the server and the client. You can check the main differences between Bluetooth and Bluetooth Low Energy here. BLE consumes approximately 100x less power than Bluetooth (depending on the use case). Unlike Bluetooth that is always on, BLE remains in sleep mode constantly except for when a connection is initiated. BLE’s primary application is short-distance transmission of small amounts of data (low bandwidth). If you’re already familiar with BLE, you can skip to the Project Overview section.īluetooth Low Energy, BLE for short, is a power-conserving variant of Bluetooth. Recommended Reading: Getting Started with ESP32 Bluetooth Low Energy (BLE) What is Bluetooth Low Energy?īefore going straight to the project, it is important to take a quick look at some essential BLE concepts so that you’re able to better understand the project later on.
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