ESP32 reset to zero GPIO pins in void loop

[XauTrop]

Sorry if this issue is not appropiate here and point me to discuss or whaterver other forum you think is the appropiate.

I'm using a ESP32 testing an tmp36. Without connecting to the wifi the reading of the TMP63 is ok. When I connect to the wifi the GPIO readings go to 0 permanently. I do a GPIO scan in the void setup and I got values, but doing the scan indise the void loop the values are always 0. A normal script passing just a temperature value to the gateway is working, so seems no problem loading the libraries (Webthings 0.12.0, arduinojson: 6.17.2, WiFi: 1.2.7). Here is the serial output:

11:24:38.815 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) 11:24:38.861 -> configsip: 0, SPIWP:0xee 11:24:38.861 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 11:24:38.861 -> mode:DIO, clock div:1 11:24:38.861 -> load:0x3fff0018,len:4 11:24:38.861 -> load:0x3fff001c,len:1216 11:24:38.861 -> ho 0 tail 12 room 4 11:24:38.861 -> load:0x40078000,len:10944 11:24:38.861 -> load:0x40080400,len:6388 11:24:38.861 -> entry 0x400806b4 11:24:39.138 -> Initiallizing ... 11:24:39.138 -> GPIO: 25 - reading: 621 11:24:39.138 -> GPIO: 2 - reading: 48 11:24:39.138 -> GPIO: 3 - reading: 0 11:24:39.138 -> GPIO: 4 - reading: 0 11:24:39.138 -> GPIO: 5 - reading: 0 11:24:39.138 -> GPIO: 6 - reading: 0 11:24:39.138 -> GPIO: 7 - reading: 0 11:24:39.138 -> GPIO: 8 - reading: 0 11:24:39.138 -> GPIO: 9 - reading: 0 11:24:39.138 -> GPIO: 10 - reading: 0 11:24:39.138 -> GPIO: 11 - reading: 0 11:24:39.138 -> GPIO: 12 - reading: 0 11:24:39.138 -> GPIO: 13 - reading: 0 11:24:39.138 -> GPIO: 14 - reading: 2918 11:24:39.138 -> GPIO: 15 - reading: 3743 11:24:39.183 -> GPIO: 16 - reading: 0 11:24:39.183 -> GPIO: 17 - reading: 0 11:24:39.183 -> GPIO: 18 - reading: 0 11:24:39.183 -> GPIO: 19 - reading: 0 11:24:39.183 -> GPIO: 20 - reading: 0 11:24:39.183 -> GPIO: 21 - reading: 0 11:24:39.183 -> GPIO: 22 - reading: 0 11:24:39.183 -> GPIO: 23 - reading: 0 11:24:39.183 -> GPIO: 24 - reading: 0 11:24:39.183 -> GPIO: 25 - reading: 768 11:24:39.183 -> GPIO: 26 - reading: 686 11:24:39.183 -> GPIO: 27 - reading: 832 11:24:39.183 -> GPIO: 28 - reading: 0 11:24:39.183 -> GPIO: 29 - reading: 0 11:24:39.183 -> GPIO: 30 - reading: 0 11:24:39.183 -> GPIO: 31 - reading: 0 11:24:39.183 -> 11:24:39.183 -> Connecting to "My Network" 11:24:39.277 -> 11:24:39.790 -> . 11:24:39.790 -> Connected to My Network 11:24:39.790 -> IP address: 192.168.1.45 11:24:39.790 -> MDNS responder started 11:24:39.790 -> HTTP server started 11:24:39.790 -> http://192.168.1.45/things/Tmp36 11:24:41.283 -> - reading: 0 11:24:41.283 -> GPIO: 2 - reading: 0 11:24:41.283 -> GPIO: 3 - reading: 0 11:24:41.331 -> GPIO: 4 - reading: 0 11:24:41.331 -> GPIO: 5 - reading: 0 11:24:41.331 -> GPIO: 6 - reading: 0 11:24:41.331 -> GPIO: 7 - reading: 0 11:24:41.331 -> GPIO: 8 - reading: 0 11:24:41.331 -> GPIO: 9 - reading: 0 11:24:41.331 -> GPIO: 10 - reading: 0 11:24:41.331 -> GPIO: 11 - reading: 0 11:24:41.331 -> GPIO: 12 - reading: 0 11:24:41.331 -> GPIO: 13 - reading: 0 11:24:41.331 -> GPIO: 14 - reading: 0 11:24:41.331 -> GPIO: 15 - reading: 0 11:24:41.331 -> GPIO: 16 - reading: 0 11:24:41.331 -> GPIO: 17 - reading: 0 11:24:41.331 -> GPIO: 18 - reading: 0 11:24:41.331 -> GPIO: 19 - reading: 0 11:24:41.331 -> GPIO: 20 - reading: 0 11:24:41.331 -> GPIO: 21 - reading: 0 11:24:41.331 -> GPIO: 22 - reading: 0 11:24:41.331 -> GPIO: 23 - reading: 0 11:24:41.331 -> GPIO: 24 - reading: 0 11:24:41.331 -> GPIO: 25 - reading: 0 11:24:41.331 -> GPIO: 26 - reading: 0 11:24:41.331 -> GPIO: 27 - reading: 0 11:24:41.377 -> GPIO: 28 - reading: 0 11:24:41.377 -> GPIO: 29 - reading: 0 11:24:41.377 -> GPIO: 30 - reading: 0 11:24:41.377 -> GPIO: 31 - reading: 0 11:24:41.377 -> GPIO: 25 - reading: 0

The code (a bit dirty due to several tests):

define ARDUINOJSON_USE_LONG_LONG 1

include

include

include

include

int tempPin = 25; //analog input pin constant

int temprdVal; // temperature sensor raw readings

float volts; // variable for storing voltage

float temp; // actual temperature variable char ssid[] = ""; char password[] = ""; int status = WL_IDLE_STATUS; //const String mDNSHostname = "Temp36sensor"; WebThingAdapter adapter; const char sensorTypes[] = {"TemperatureSensor", nullptr}; ThingDevice sensor("Tmp36", "Temp36 Temperature Sensor", sensorTypes); ThingProperty sensorTemp("temperature", "", NUMBER, "TemperatureProperty"); ThingProperty sensorHumd("humidity", "", NUMBER, nullptr); ThingProperty sensorPres("pressure", "", NUMBER, nullptr);

void setup() { // initialize serial:

Serial.begin(115200); Serial.println(" Initiallizing ... "); read_gpio(); for (tempPin = 2; tempPin < 32; tempPin++) { temprdVal = analogRead(tempPin); Serial.print("GPIO: "); Serial.print(tempPin); Serial.print(" - reading: "); Serial.println(temprdVal);

}

Serial.println(""); Serial.print("Connecting to \""); Serial.print(ssid); Serial.println("\"");

if defined(ESP8266) || defined(ESP32)

WiFi.mode(WIFI_STA);

endif

WiFi.begin(ssid, password); Serial.println("");

// Wait for connection bool blink = true; while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print(".");

Serial.println(""); Serial.print("Connected to "); Serial.println(ssid); Serial.print("IP address: "); Serial.println(WiFi.localIP()); adapter = new WebThingAdapter("tempsensor", WiFi.localIP()); // Set units for properties sensorTemp.unit = "celsius";

// Associate properties with device sensor.addProperty(&sensorTemp); // Associate device with connection adapter->addDevice(&sensor); // Start mDNS and HTTP server adapter->begin();

Serial.println("HTTP server started"); Serial.print("http://"); Serial.print(WiFi.localIP()); Serial.print("/things/"); Serial.println(sensor.id); delay(1500); } Serial.print(" - reading: "); Serial.println(temprdVal); }

void loop() {

//read the temp sensor and store it in tempVal for (tempPin = 2; tempPin < 32; tempPin++) { temprdVal = analogRead(tempPin); Serial.print("GPIO: "); Serial.print(tempPin); Serial.print(" - reading: "); Serial.println(temprdVal);

} int tempPin = 25; //analog input pin constant temprdVal = analogRead(tempPin); Serial.print("GPIO: "); Serial.print(tempPin); Serial.print(" - reading: "); Serial.println(temprdVal); volts = temprdVal/1023.0; // normalize by the maximum temperature raw reading range

temp = (volts - 0.5) * 100 ; //calculate temperature celsius from voltage as per the equation found on the sensor spec sheet.

Serial.print(" Temperature is: "); // print out the following string to the serial monitor Serial.print(temp); // in the same line print the temperature Serial.println (" degrees C"); // still in the same line print degrees C, then go to next line. ThingPropertyValue value; value.number = temp; sensorTemp.setValue(value); adapter->update(); delay(10000); // wait for 1 second or 1000 milliseconds before taking the next reading. }

Any advise? Thank you

[XauTrop]

UPDATE: I tried the LED example, it didn't worked with the GPIO pin 25 but worked with 13. Then I tryied the temperature code with the pin 13 with no results. I also declared the pin as INPUT, and nothing. I also did not included the wifi library in case was causing any issue, but not working again.

[XauTrop]

UPDATE: As far I could read on the webs, the issue was not with the webthing-arduino library but with the ESP32 and the Wifi module. When the wifi module is emmiting the ADC2 pins become useless due to a drop in power. Only pins ADC1 can be used (as pin33), but you need to define it as input ... :

  int sensorPin = 33;
  pinMode(sensorPin,INPUT);
  adcAttachPin(sensorPin);

Sorry for the issue here. I hope this will helpfull for other Thanks!