Trying to get data but getting random values. (ESP32)

[githubUnknownUser]

Good evening, @PowerBroker2! Congratulations on the amazing job you did here!!!

I'm trying to use the library but I'm facing some problems. First, let me give you a hint of my hardware setup:

2010 Honda -> ELM327 -> ESP32-WROVER-B (Bluetooth)

I tried the default example code but I couldn't get the esp to connect, so I took some code from the BluetoothSerial library and then worked.

When I tried to use the default ELMduino initializer (Auto protocol detector) I got 'ERROR: ELM_TIMEOUT'.

When I set the protocol, the setup completes gratefully, but I'm getting random reads using 'myELM327.rpm()'.

I've tried some workarounds like the #123 or #92 but unfortunately, none of them worked for me.

Can you help me? I might be doing something wrong...

Here's my code and the Logs: (The Bluetooth connection is an absolute mess but I waiting for everything to workout first to clean it)

'

include "BluetoothSerial.h"

include "ELMduino.h"

BluetoothSerial SerialBT;

define ELM_PORT SerialBT

define DEBUG_PORT Serial

define BT_DISCOVER_TIME 10000

esp_spp_sec_t sec_mask = ESP_SPP_SEC_NONE; // or ESP_SPP_SEC_ENCRYPT|ESP_SPP_SEC_AUTHENTICATE to request pincode confirmation esp_spp_role_t role = ESP_SPP_ROLE_SLAVE; // or ESP_SPP_ROLE_MASTER

ELM327 myELM327;

uint32_t rpm = 0;

void bluetoothConnect();

void setup() { bluetoothConnect();

// while (!myELM327.begin(ELM_PORT, true, 2000, '4')) { while (!myELM327.begin(ELM_PORT, true, 2000)) { Serial.println("Couldn't connect to OBD scanner - Phase 2"); }

Serial.println("Connected to ELM327"); }

void loop() { float tempRPM = myELM327.rpm();

if (myELM327.nb_rx_state == ELM_SUCCESS) { rpm = (uint32_t)tempRPM; Serial.print("RPM: "); Serial.println(rpm); } else if (myELM327.nb_rx_state != ELM_GETTING_MSG) myELM327.printError(); }

void bluetoothConnect() { Serial.begin(115200); if (!SerialBT.begin("ESP32test", true)) { Serial.println("========== serialBT failed!"); abort(); }

Serial.println("Starting discoverAsync..."); BTScanResults btDeviceList = SerialBT.getScanResults(); // maybe accessing from different threads! if (SerialBT.discoverAsync([](BTAdvertisedDevice pDevice) { // BTAdvertisedDeviceSetset = // reinterpret_cast<BTAdvertisedDeviceSet>(pDevice); // btDeviceList[pDevice->getAddress()] = * set; Serial.printf(">>>>>>>>>>>Found a new device asynchronously: %s\n", pDevice->toString().c_str()); })) { delay(BT_DISCOVER_TIME); Serial.print("Stopping discoverAsync... "); SerialBT.discoverAsyncStop(); Serial.println("discoverAsync stopped"); delay(1000);

if (btDeviceList->getCount() > 0) {
  BTAddress addr;
  int channel = 0;
  Serial.println("Found devices:");
  for (int i = 0; i < btDeviceList->getCount(); i++) {
    BTAdvertisedDevice *device = btDeviceList->getDevice(i);

    Serial.printf(" ----- %s  %s %d\n", device->getAddress().toString().c_str(), device->getName().c_str(), device->getRSSI());

    std::map<int, std::string> channels = SerialBT.getChannels(device->getAddress());

    Serial.printf("scanned for services, found %d\n", channels.size());

    for (auto const &entry : channels) {
      Serial.printf("     channel %d (%s)\n", entry.first, entry.second.c_str());
    }
    if (channels.size() > 0) {
      addr    = device->getAddress();
      channel = channels.begin()->first;
    }

    if (device->getName() == "OBDII") {
      Serial.println("OBDII Founded!");
      Serial.print("Add ->");
      Serial.println(device->getAddress());
      break;
    }
  }
  Serial.print("Before connect ->");
  Serial.println(addr);
  if (addr) {
    Serial.printf("connecting to %s - %d\n", addr.toString().c_str(), channel);
    SerialBT.connect(addr, channel, sec_mask, role);
  }
} else {
  Serial.println("Didn't find any devices");
}

} else { Serial.println("Error on discoverAsync f.e. not workin after a \"connect\""); } } , hondaObd2.txt LogAutoProtocol.txt LogSettingProtocol.txt

[PowerBroker2]

What year is your car? If it was made before 2008 I can't guarantee this library will work with your car. If your car was made after 2008, your ELM327 is most likely faulty and should replace it with a new one. I've had good luck with these units

[githubUnknownUser]

My car is from 2010, But the stranger thing is that the module works fine with phone apps. I'm using the latest version of the library. I've noticed that the bytes 0 and 3 seem to carry the information... I don't know what to do

[PowerBroker2]

If different bytes carry the info, you can use lower level functions of the library to directly query the PID and use the built-in response byte objects to process the data yourself in the sketch.