Hello,
Is it possible to select the connection type (Bluetooth or WiFi) on the ESP32 via a Switch?
I want to count the pulses of my geigercounter and either Stream them to the cloud via WiFi or directly to my mobilewhen I am out in the field. At the same time, the Device shows all Values on a small 128x32 OLED Display. This is what I have got so far:
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <BlynkSimpleEsp32_BT.h>
#define CONV_FACTOR 0.00658
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET 4
#define BLYNK_USE_DIRECT_CONNECT
#define BLYNK_PRINT Serial
int geiger_input = 18;
float voltage = 0;
long count = 0;
long countPerMinute = 0;
long timePrevious = 0;
long timePreviousMeassure = 0;
long _time = 0;
long countPrevious = 0;
float radiationValue = 0.0;
volatile unsigned long last_micros;
long debouncing = 4200;
float Dosisleistung = 0;
char auth[] = "YOUR_AUTH_HERE";
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
BlynkTimer timer;
void setup(){
pinMode(geiger_input, INPUT);
Blynk.setDeviceName("Geigerzähler");
Blynk.begin(auth);
Serial.begin(9600);
attachInterrupt(geiger_input, countPulse, HIGH);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
}
display.display();
delay(200);
display.clearDisplay();
timer.setInterval(5000L, sendDatatoBLClient);
}
void loop(){
if (millis()-timePreviousMeassure > 20000){
countPerMinute = 3*count;
radiationValue = countPerMinute * CONV_FACTOR;
Dosisleistung = Dosisleistung + (radiationValue / float(240.0));
timePreviousMeassure = millis();
float voltage = (float)analogRead(36) / 4096 * 4.2 * (3667 / 3300);
if(Dosisleistung > 99.999){
Dosisleistung = 0;
}
Serial.println("cpm = ");
Serial.print(countPerMinute,DEC);
Serial.print(" - ");
Serial.print("Dosisrate = ");
Serial.print(radiationValue,2);
Serial.print("uSv/h");
Serial.print(" - ");
Serial.print("Equivalenz = ");
Serial.print(Dosisleistung,4);
Serial.print("uSv");
display.setCursor(0,0);
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.print(countPerMinute, DEC);
display.setCursor(40, 0);
display.print("CPM");
display.setCursor(0,10);
display.print(Dosisleistung,3);
display.setCursor(40, 10);
display.print("uSv");
display.setCursor(0, 20);
display.println(voltage,2);
display.setCursor(40,20);
display.println("V");
if((radiationValue,2) < 9.99){
display.setTextSize(2);
}else{
display.setTextSize(1);
}
display.setCursor(65, 10);
display.print(radiationValue,2);
display.setTextSize(1);
display.setCursor(90, 25);
display.print("uSv/h");
display.display();
delay(2000);
count = 0;
}
Blynk.run();
timer.run();
}
void countPulse(){
if((long)(micros() - last_micros) >= debouncing){
Puls();
last_micros = micros();
}
}
void Puls(){
count++;
}
void sendDatatoBLClient(){
Blynk.virtualWrite(V1, countPerMinute);
Blynk.virtualWrite(V2, countPerMinute);
Blynk.virtualWrite(V3, radiationValue);
Blynk.virtualWrite(V4, radiationValue);
Blynk.virtualWrite(V5, Dosisleistung);
Blynk.virtualWrite(V6, Dosisleistung);
Blynk.virtualWrite(V7, voltage);
Blynk.virtualWrite(V8, voltage);
}
The Display and counting the pulses works fine. The only problem is, that I cant figure out how to select the Connection type. Essentially I want the ESP32 to use Bluetooth when GPIO14 is floating (LOW) and to use WiFi when it is HIGH.
, like this, can create a real headache, but we all can learn from that by doing something 
. Looking forward to your next project and idea.
… but alas, Blynk needs some form of server connection at ALL times.
… “They’re coming to take me away ho ho hee hee ha haaa…”