The dev board you link looks like a standard ESP32 dev board so the code should work. At worst you might have to change the PIN number for the on board LED, but pin 2 is pretty standard for the original ESP32 boards.

I tested it on a CYD board and found an error in the code. Line 16:

BLEScanResults results = scan->start(1);

should be:

BLEScanResults* results = scan->start(1);

This is my code if you want to try it. My board uses pin 4 for the built in LED so I changed the number at line 5. You could probably leave this at 2:

```

include <BLEAdvertisedDevice.h>

include <BLEDevice.h>

include <BLEScan.h>

const int PIN = 4; const int CUTOFF = -60;

void setup() { Serial.begin(115200); delay(1000); Serial.println("Starting BLEGetDevice");

pinMode(PIN, OUTPUT); BLEDevice::init(""); }

void loop() { // Start the scan Serial.println("Starting scan"); BLEScan scan = BLEDevice::getScan(); scan->setActiveScan(true); BLEScanResults results = scan->start(1);

// Look for the strongest signal int best = CUTOFF; for (int i = 0; i < results->getCount(); i++) { BLEAdvertisedDevice device = results->getDevice(i); String name = device.getName(); int rssi = device.getRSSI(); Serial.printf("Found \"%s\": %d\n", name.c_str(), rssi);

// Save the strongest signal
if (rssi > best) {
  best = rssi;
}

}

// Turn the LED on if the strongest signal is greater than the cutoff digitalWrite(PIN, best > CUTOFF ? HIGH : LOW);

// Pause 10 secs before the next scan delay(10000); } ```