Error in getting Multiple PID's

[Shaikh010]

Setup
I have used esp 32 wroom and car is basically suzuki vitara.

Error:
I have used single PID example and it works perfectly but when I use Multiple PID's example I am getting error ElmTimout error
screenshot is attached help me fix it kindly have studied all the issues but can't get my required one.
Anybody kindly help me out.

[jimwhitelaw]

Which specific examples are you using? Note that "ESP32_Bluetooth_Serial.ino" uses Bluetooth for a single PID test and "multiple_pids.ino" uses HW Serial for the multiple PID test. So they aren't directly interchangeable with the same adapter.

[jimwhitelaw]

@Shaikh010, I have added a new example sketch that queries multiple PIDs using the same type of BT connection as the "ESP32_Bluetooth_Serial.ino" sketch. Not sure if that's the issue you're seeing, but it may help others in the future.

[Bakar002]

@jimwhitelaw I have esp 32 module and obd 2 sensor it is showing correct data when using single Pid function but it shows time out error when i use multiple pid example code .
i just simply need multiple pids like coolant temp, engine temp, speed, rpm, abs load etc how may i get this data ?

[jimwhitelaw]

@Bakar002 Are you using the multiple PID sketch I linked to above? If not, please post (with formatting) the sketch you are using and post the full serial/debug output to help us see what is happening.

[Bakar002]

@jimwhitelaw Have tried you new code why it is giving me wrong data and also give data in a very fast manner.Like when i connect it with esp 32 it connects but when it connects it gives serial data in a very fast manner and give wrong data

[jimwhitelaw]

@Bakar002 please post the serial output so we can see what's happening. A fast response isn't an indication that something is wrong, unless every query results in '?' or 'NO DATA'.