[keanecn]

I am using version 3.6. The first time I tried the ecu, I connected the Hall sensor. At first, the computer was able to connect normally and read the speed. However, I don't know what happened later, but 2560 crashed. If I removed 2560 and ran it separately, it could connect to the computer again. If I installed it on the Speedduino board, it would crash and not work. Later, I removed the 5V voltage reducing chip and it was able to connect to the computer normally. Then, I replaced the 5V voltage reducing chip,I can connect to the computer normally again, but when I continued to test with the Hall sensor, the problem occurred again. The 5V voltage reducing chip is heating up severely and cannot connect to the computer. Now that I have removed the voltage reducing chip, it still cannot connect to the computer normally. The ECU is in a frozen state, and after removing 2560, it can connect to the computer alone. Where do I need to plug in the fault?

[keanecn]

Can the burnt out 5V voltage regulator chip be replaced with 7805 instead of LM2940? I am a beginner from China and I hope Speeduino can thrive here. Currently, I am facing this problem, please help me, senior

[dazq]

Can the burnt out 5V voltage regulator chip be replaced with 7805 instead of LM2940? I am a beginner from China and I hope Speeduino can thrive here. Currently, I am facing this problem, please help me, senior

Yes you can but it's not recommended.
The Lm will work with a lower input voltage than a std 7805 so copes better with cranking etc.

From what you described it seems that you have a problem with either
1.the hall sensor itself
2.the external wiring from sensor to the speeduino
3.the assembly of the components in the crank/cam circuit on the speeduino PCB itself.

Did you check operation with ardustim/ other crank/cam sim before installing into the vehicle?

There is no point keep replacing the regulator until you fix the cause.

[keanecn]

Can the burnt out 5V voltage regulator chip be replaced with 7805 instead of LM2940? I am a beginner from China and I hope Speeduino can thrive here. Currently, I am facing this problem, please help me, senior

Yes you can but it's not recommended.
The Lm will work with a lower input voltage than a std 7805 so copes better with cranking etc.

From what you described it seems that you have a problem with either
1.the hall sensor itself
2.the external wiring from sensor to the speeduino
3.the assembly of the components in the crank/cam circuit on the speeduino PCB itself.

Did you check operation with ardustim/ other crank/cam sim before installing into the vehicle?

There is no point keep replacing the regulator until you fix the cause.

Hello, thank you for your help. I'm not accepting any more tasks at the moment, just focusing on the 2560+ circuit board. I have removed the SP721 chip and 4424 chip from the circuit board, but it still crashes. I'm not sure if there's a short circuit or something else going on. I can't connect it to the computer. The 2560 seems to be in a protective state. I'm not sure which component on the circuit board is faulty. Please help me troubleshoot it. Thank you

[LPG2CV]

remove the mega from the speeduino board and see if you can connect the mega to the pc/laptop

[keanecn]

remove the mega from the speeduino board and see if you can connect the mega to the pc/laptop

remove the mega from the speeduino board ，the 2560 normal operation， i dont know why

[dazq]

remove the mega from the speeduino board and see if you can connect the mega to the pc/laptop

remove the mega from the speeduino board ，the 2560 normal operation， i dont know why

There is a short either in the wiring to the speeduino or a short circuit during construction.