I have a problem with the connection between the arduino esp32 wroom and the thunkable app via bluetooth low energy. Does anyone have any idea why this is not working as it should. Thanks for help in advance. And if you have any working example please if you can provide it. I would need to send and receive data and connect which is key. Good day Jernej
I already got this from someone and it doesn’t work as well as it should on BlueLight it doesn’t find it at all
Arduino code:
/*
Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleServer.cpp
Ported to Arduino ESP32 by Evandro Copercini
updates by chegewara
*/
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#include “DHTesp.h”
#include
/** Comfort profile */
ComfortState cf;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID “4fafc201-1fb5-459e-8fcc-c5c9c331914b”
#define CHARACTERISTIC_UUID “beb5483e-36e1-4688-b7f5-ea07361b26a8”
BLECharacteristic *pCharacteristic;
#define DHTpin 14 //D5 of NodeMCU is GPIO14
DHTesp dht;
void setup() {
Serial.begin(115200);
Serial.println(“Starting BLE work!”);
Serial.println(“Status\tHumidity (%)\tTemperature (C)\t(F)\tHeatIndex (C)\t(F)”);
dht.setup(DHTpin, DHTesp::DHT11); //for DHT11 Connect DHT sensor to GPIO 17
BLEDevice::init(“esp32 Weather Station”);
BLEServer *pServer = BLEDevice::createServer();
BLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE
);
pCharacteristic->setValue(“Hello World says Neil”);
pService->start();
// BLEAdvertising *pAdvertising = pServer->getAdvertising(); // this still is working for backward compatibility
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(true);
pAdvertising->setMinPreferred(0x06); // functions that help with iPhone connections issue
pAdvertising->setMinPreferred(0x12);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_DEFAULT);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL0);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL1);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL2);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL3);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL4);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL5);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL6);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL7);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_CONN_HDL8);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_ADV);
BLEDevice::setPower(ESP_PWR_LVL_P7, ESP_BLE_PWR_TYPE_SCAN);
BLEDevice::startAdvertising();
Serial.println(“Characteristic defined! Now you can read it in your phone!”);
}
void loop() {
delay(dht.getMinimumSamplingPeriod());
float humidity = dht.getHumidity();
float temperature = dht.getTemperature();
Serial.print(dht.getStatusString());
Serial.print(“\t”);
Serial.print(humidity, 1);
Serial.print(“\t\t”);
Serial.print(temperature, 1);
Serial.print(“\t\t”);
Serial.print(dht.toFahrenheit(temperature), 1);
Serial.print(“\t\t”);
Serial.print(dht.computeHeatIndex(temperature, humidity, false), 1);
Serial.print(“\t\t”);
Serial.println(dht.computeHeatIndex(dht.toFahrenheit(temperature), humidity, true), 1);
TempAndHumidity newValues = dht.getTempAndHumidity();
// Check if any reads failed and exit early (to try again).
if (dht.getStatus() != 0) {
Serial.println("DHT11 error status: " + String(dht.getStatusString()));
}
float heatIndex = dht.computeHeatIndex(newValues.temperature, newValues.humidity);
float dewPoint = dht.computeDewPoint(newValues.temperature, newValues.humidity);
float cr = dht.getComfortRatio(cf, newValues.temperature, newValues.humidity);
String comfortStatus;
switch (cf) {
case Comfort_OK:
comfortStatus = “Decent”;
break;
case Comfort_TooHot:
comfortStatus = “Too hot”;
break;
case Comfort_TooCold:
comfortStatus = “Too cold”;
break;
case Comfort_TooDry:
comfortStatus = “Too dry”;
break;
case Comfort_TooHumid:
comfortStatus = “Too humid”;
break;
case Comfort_HotAndHumid:
comfortStatus = “Hot and humid”;
break;
case Comfort_HotAndDry:
comfortStatus = “Hot and dry”;
break;
case Comfort_ColdAndHumid:
comfortStatus = “Cold and humid”;
break;
case Comfort_ColdAndDry:
comfortStatus = “Cold and dry”;
break;
default:
comfortStatus = “psh, we don’t know what to call it.”;
break;
};
// create string
String myString = String(“{"T":"” + String(dht.toFahrenheit(newValues.temperature)) + “","H":"” + String(newValues.humidity) + “","I":"” + String(dht.toFahrenheit(heatIndex)) + “","D":"” + String(dht.toFahrenheit(dewPoint)) + "","comfort":" " + comfortStatus + “"}”);
Serial.println(myString);
// get length of string (with one extra character for the null terminator)
int str_len = myString.length() + 1;
// Prepare the character array (the buffer)
char char_array[str_len];
// copy the string into char_array
myString.toCharArray(char_array, str_len);
//update the ble characteristic
pCharacteristic->setValue(char_array);
}
