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Thank you @xxxajk . I tried to use 817 optocoupler component on my PWM signal line. Not worked. May be frequecy is not enough. I will try high frequency types. Feedback signal voltage comes from Servo to analog pin. So when the voltage exceed the protection limit, short circuit will be. To...

Thank you @xxxajk . I designed 2 diffrent circuits below. PWM signal protecitons are same for both of them with optocoupler. But for the analog signal pins protection, 1st one was made according to your protection circuit advice. Components are not totally same with your circuit since I could...

@xxxajk , do you have any suggestion about this issue? How can i protect and isolate my teensy board for the PWM output pins and analog input pins? For pwm, i can use optocoupler module. Is it logical?

In this case after positioning trouble for RC servo, marked component is becoming hot. It is a microcontroller about USB communication. Now PC can not recognize it. How can I repair it if it is possible? Can I replace microcontroller without any diagnostic? @PaulStoffregen could you check it...

Yes, I saw it from GitHub link. No problem. But my pin 22 is being used for another input. So it is hard to change it on PCB. So firstly, I will switch to magnetic hall effect sensor and try it. If problem ontinues, I will evaluate for other options like using frequency library with pin-22. Thanks.

I wondered the reason. Why it can be mulfunction without any plugged thing. I think Teensy boards are very sensitive.

Thank you @KrisKasprzak. Let me check it.

Ok. I will try it. Could you share your sensor code please?

I have tried enabling interrupt function before and after delay. Also tried cancelled, increased and decreased delay time. But nothing changed. Thank you for your suggestion @defragster. Thank you for your suggestions @KrisKasprzak. I have tried some methods to understand the problem yesterday...

Hello @BillFM. Ok, I will try it with shorted out led and mention about result. I am also suspicious from the that led also. I have also tried the +12V signal source for opto. It was more problematic than 7V source. Because when i aplied 7V, it was measuring up to 3600 rpm and staying at this...

Thank you @BillFM . Sorry, i skipped to copy that part while extracting RPM sensor codes. Actually, it has been initialized at setup as: pinMode(sensorPin, INPUT_PULLUP); attachInterrupt(digitalPinToInterrupt(sensorPin), pulseISR, FALLING); Ok. Let me short out LED_SENS1 and try. Can it be...

Thank you very much for your suggestion @kd5rxt-mark. Acctually there are diffrent functions in my code like DC servo control, data reading & writing to Dwin HMI via UART, Can-Bus control, some button control etc. It is multi tasking code. Main aim of threads is preventing function interrupts...

Hi to all, I have made and engine RPM sensor with Teensy 4.1 board. It is reading alternators rpm and write it to Dwin HMI. I have used LJ12A3-4-z/AY PNP inductive sensor. It trigers once per revolotion. My problem is this : It reads normally until the 3600 rpm. But it can not read more than...

Thank you very much @xxxajk . But if you have full circuit, could you share it please? I could not understand that how i can place this diagram to my circiut.

Yes, if you have an example, could you share it with me please?

Thank you very much for your very beneficial advices @xxxajk . They are very important tips. I have added some of them like using diodes to prevent reverse polarity troubles. But I will add fuse and crowbar circuit to circuit to increase protection. Additionally to this list, do not any wiring...

Thank you for your suggestion and advice. As you mentioned or estimated in your post, yes I didn't use connector to connect my servos to power supply. It was possible risk for short circuit. Thus it happened. Ok. No need to spend time for recover. It is better to new one even it is expensive :(

Thank you very much Paul. When I measure the 3V-GND pins DC voltage, I saw that 0.08 V. It is almostly closer to 0 VDC. So do you have any comment about it?

Hello everybody, I have a problem with my Teensy 4.1 board. Today, while i was trying some codes with RC servos, one analog signal wire was touched to servo's GND or +12V mistakenly and caused short circuit. Now, my teensy board does not run. When I energized it via USB, marked component with...