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ESP32-BLE-Scanner

The ESP32-BLE-Scanner is used to detect BLE devices and to read RSSI value for each.

Detailed description

The BLE-Scanner has a list of known devices (pre-defined by user) and a RSSI threshold. Once the list of detected devices contains any of known devices and its RSSI is greater than the threshold, the BLE-scanner turns on a LED. When there no detected devices from the list and with RSSI signal greater than threshold for 3 minutes the LED turns off.

Preparation

Hardware

  • Any ESP32 module or development board. For debugging purposes the TTGO-T8-ESP32 board was used

Software

  • Arduino IDE (1.8 or above)
  • Arduino IDE ESP32 Board Installation

Installation and Running

  1. Open the ESP32_BLE_Scanner.ino Arduino sketch in Arduino IDE.
  2. Edit defines to fit your needs:
#define LED_PIN 21                // Pin for LED to indicate beacon presence
#define MIN_RSSI -80              // Minimum RSSI [db] needed to perform address comparison
#define SCAN_TIME 10              // seconds
#define LOOP_TIME 5               // seconds
#define NO_DEVICE_TIMER 3*60      // seconds
  1. Compile ESP32_BLE_Scanner.ino Arduino sketch, and flash it to ESP32 board. After flashing, ESP32 scans for BLE devices during SCAN_TIME and behaves as listed in Detailed description. You can check what the scanner does using Arduino terminal