الطريقة التانية بتعتمد على نظام ادارة المحرك الاصلى فى السيارة وقرائه مؤشراته من خلال بروتوكول OBD زى اجهزة قرائه الاعطال بس هنضيف عليها دائرة انذار صوتى وعموما ممكن تطويرها لقياس مؤشرات اكتر من حرارة المحرك زى الامثلة دية
I always thought it was a little funny that cars don’t do more to alert you when your car is on the brink of overheating. Especially considering that it is one quick way to kill an engine.
To solve that problem, I used an off the shelf OBD II adapter to connect to the cars onboard computer. An Arduino Mini sends commands to the ODB II adapter asking for the cars coolant temperature. If the temperature reaches a specific threshold it will sound an audible alarm.
Credit is due to an instructable that got me started. I happened to find a more convenient location to attach the RX/TX lines from the Arduino to the ELM327 adapter although I did re-purpose a good portion of his code, his instructable can be found here:
https://www.instructables.com/id/Hack-an-ELM327-Cab...
Thanks mviljoen2
The entire project is fairly simple to implement, however this device will continue to draw power from the car’s battery if it is left plugged in while the car is turned off. The draw wont be much, maybe a couple hundred mA, you could most likely leave it connected for a very long time without causing an issue; however I did think it was worth mentioning.
A small word of caution, the first ELM327 adapter I received was a clone and didn’t end up working as I expected it to. The second unit I ordered was laid out the way I expected and worked great.
The cost of this project is pretty minimal, I think I picked up the ODB II scanner for $10 plus shipping. The only other costs, are an Arduino and a small speaker. In total I think I spent $28 on this project.
In my previous instructable i created an OBD2 Simulator so that i didn't have to test my Arduino OBD2 Reader in the car the whole time but instead in the comfort of my own home.
Stuff you need.
Arduino UNO
LCD shield
ELM327 USB cable.
What it can read
Coolant Temp,IAT Temp,Ambient Temp, Throttle %,RPM,Vehicle Speed, Air flow Rate,Barometric Pressure
I will be removing the board from the ELM327 Enclosure and then bypass the USB bridge chip and attach the Serial TX/RX pins of the arduino to the Serial TX/RX pins onto the ELM327 board, program the arduino and attach the ELM327 OBD2 connector to the OBD2 port .
Pretty Simple
للمزيد من المعلومات
https://www.arduino.cc/en/main/arduinoBoardUno
http://www.instructables.com/id/Car-...erature-Alarm/
http://www.instructables.com/id/Hack...cann/?ALLSTEPS