ESP32 Forum

Posted: **Sun Mar 04, 2018 1:37 am**

Hey

I have an app which can read sensor values from the esp32 over BLE and i can also write to the seriell monitor. Now i wanted to make an Slider to controll the brightness of a LED. I found an nice example but it didnt work for me because he uses a arduino101 and has the analogWrite command which dont work on esp. (btw: im using ESP32_BLE_UART example)

Code: Select all

if (switchCharacteristic.written()) {

          Serial.println(switchCharacteristic.value());

          int light = map(switchCharacteristic.value(),10,49,0,255);

          analogWrite(lightPin,light);

has some one a idea ?

Posted: **Sun Mar 04, 2018 2:33 am**

you could use dac output, somthing like:

Code: Select all

dacWrite(25,light);

instead of analog write

Posted: **Sun Mar 04, 2018 11:06 pm**

maneco wrote:you could use dac output, somthing like:
Code: Select all
dacWrite(25,light);
instead of analog write

No, because analogwrite in this context is PWM

Posted: **Sun Mar 04, 2018 11:32 pm**

Hey now with this code:

Code: Select all

  
  
      std::string rxValue = pCharacteristic->getValue();
  
     if (rxValue.length() > 0) {  
         int light = map(rxValue.length(),10,49,0,255); 
          Serial.println(rxValue.length());
         dacWrite(LED,light);

i only get 4 4 4 .... what do i have to write instead of length ?

btw: I think I recieve strings .. so will this work ?.. sry im pretty noob in programming

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