![]() If the current is coming from an external power source directly connected to the 5V connector pin, the regulator can do nothing about it.Īnother consequence of applying more than 5V to the 5V connector pin is possible damage to the PC’s USB port. IT WILL NOT! The only thing the 5V regulator can do is control current coming from the USB port or the external DC power jack. It is a common misconception that the Arduino 5V regulator will ensure that the 5V voltage remains at 5V, no matter what. This voltage is directly connected to the ATmega328P microcontroller, the ATmega16U2 USB interface microcontroller, and the 5V regulator, all of which can be damaged by voltages exceeding 6V, and the resulting currents that flow. There is no protection on the 5V connector pin. ![]() Many components on the Arduino will be destroyed, and this voltage can also appear on your computer’s USB port, possibly damaging it. I read on Rugged Circuits website, under 10 ways to kill an arduino boardĪpply a voltage of 6V or higher to the 5V connector pin. Would connecting >5V to the arduino 5V pin not damage it? Something like this, although I might choose greater resistance: Then a couple of diodes wired to prevent the voltage from going more than one diode drop above Vcc or below Gnd. When I use a piezo, I put a resistor in parallel with the piezo to moderate the sensitivity, and a resistor between the piezo and whatever circuit it is feeding. How much voltage generated by which piezo? There is no such thing as a generic piezo. The trust that you won't drop a brick on it. ![]() ![]() Will the loop() function execute fast enough to just output the values (2000RPM is ~33Hz) or is there a way to 'listen' to the piezo for a moment, then output its maximum value reached?īad design. If I am spinning the rotor at an unknown speed, somewhere near ~2000RPM, and ONLY care about the magnitude of vibration (not phase angle or which blade etc) what is the best way to go about this? I assume a piezo mounted on a hub with a spinning rotor is going to output a voltage roughly following a messy sine wave and I am only interested in the peaks. Which points to another question, why in the Knock tutorial do they only have a resistor in parallel with the piezo? If you were to drop a brick on it and it generated 25V for a moment, a resistor in parallel is not going to stop 25V reaching the arduino, it will draw some current but the potential across the analogue pin and ground will still be 25V and I thought this would damage the board. I can't find any information about how much voltage the piezo can generate when tapped - I assume over 5V if you dropped it. I want to balance a rotor head using the piezo and arduino uno to detect vibration and I have a few questions. ![]()
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