ESP32 not connecting to ELM327

[saleh-alobaidi]

Hello
I'm working on a vehicle black box system for my end-of-year project and i cant connect the esp32 to elm327

i ran the ESP32 test sketch and got the same output: "Couldn't connect to OBD scanner."

Is there a way to initiate communication first? Do I need to force the esp32 to be in master mode in order to communicate?

[jimwhitelaw]

The ESP32_test.ino sketch uses a Bluetooth device name of "OBDII" with no PIN. Is that correct for your ELM327 device?

[saleh-alobaidi]

OBDII has default pin 1234 i managed to connect it with some other code but i had to change boards for some reason for it to work but the problem is i cant send any commands to ELM, i tried AT commands and OBD commands but no feedback ` #include "BluetoothSerial.h" BluetoothSerial SerialBT; String MACadd = "00:10:CC:4F:36:03"; uint8_t address[6] = { 0x00, 0x10, 0xCC, 0x4F, 0x36, 0x03 }; String name = "OBDII"; char *pin = "1234"; //<- standard pin would be provided by default bool connected; void setup() { Serial.begin(115200); SerialBT.setPin(pin); SerialBT.begin("ESP32", true); Serial.println("The device started in master mode, make sure remote BT device is on!"); connected = SerialBT.connect(address); if (connected) { Serial.println("Connected Succesfully!"); } else { while (!SerialBT.connected(10000)) { Serial.println("Failed to connect. Make sure remote device is available and in range, then restart app."); } } } void loop() { if (Serial.available()) { SerialBT.write(Serial.read()); } if (SerialBT.available()) { Serial.write(SerialBT.read()); } delay(20); } ```

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________________________________ من: Jim Whitelaw ***@***.***> ‏‏تم الإرسال: 19/شعبان/1445 03:40 ص إلى: PowerBroker2/ELMduino ***@***.***> نسخة: saleh-alobaidi ***@***.***>; Author ***@***.***> ‏‏الموضوع: Re: [PowerBroker2/ELMduino] ESP32 not connecting to ELM327 (Issue #231) The ESP32_test.ino sketch uses a Bluetooth device name of "OBDII" with no PIN. Is that correct for your ELM327 device? — Reply to this email directly, view it on GitHub<#231 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BEAGSSM3KYPKYVO2BDDODDLYV7E6LAVCNFSM6AAAAABD67THACVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNZQGE3TCNBZHE>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[jimwhitelaw]

It's hard to know exactly what's happening without the serial/debug output. Perhaps try the examples/ESP32_Bluetooth_Serial/ESP32_Bluetooth_Serial.ino sketch and post the serial output here.

[saleh-alobaidi]

This is the output [cid:e5b771a8-950d-457b-8d35-42327304d5af]

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________________________________ من: Jim Whitelaw ***@***.***> ‏‏تم الإرسال: 20/شعبان/1445 03:59 ص إلى: PowerBroker2/ELMduino ***@***.***> نسخة: saleh-alobaidi ***@***.***>; Author ***@***.***> ‏‏الموضوع: Re: [PowerBroker2/ELMduino] ESP32 not connecting to ELM327 (Issue #231) It's hard to know exactly what's happening without the serial/debug output. Perhaps try the examples/ESP32_Bluetooth_Serial/ESP32_Bluetooth_Serial.ino sketch and post the serial output here. — Reply to this email directly, view it on GitHub<#231 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BEAGSSOIHGOSAORHEN6GLO3YV7HGBAVCNFSM6AAAAABD67THACVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNZSGI2TCMRRG4>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[saleh-alobaidi]

Hello I'm still stuck with the same problem, I can't connect the ESP32 to the ELM327. I also tried with HC-05, and it still won't connect. I appreciate your assistance in any way you can.

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________________________________ من: Jim Whitelaw ***@***.***> ‏‏تم الإرسال: 20/شعبان/1445 03:59 ص إلى: PowerBroker2/ELMduino ***@***.***> نسخة: saleh-alobaidi ***@***.***>; Author ***@***.***> ‏‏الموضوع: Re: [PowerBroker2/ELMduino] ESP32 not connecting to ELM327 (Issue #231) It's hard to know exactly what's happening without the serial/debug output. Perhaps try the examples/ESP32_Bluetooth_Serial/ESP32_Bluetooth_Serial.ino sketch and post the serial output here. — Reply to this email directly, view it on GitHub<#231 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BEAGSSOIHGOSAORHEN6GLO3YV7HGBAVCNFSM6AAAAABD67THACVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMYTSNZSGI2TCMRRG4>. You are receiving this because you authored the thread.Message ID: ***@***.***>