10 years, 7 months ago.

Maximun voltage on signal HCDR04

Hi, considering that mbed board works with a maximun Input/Output voltage of 3.3 volts, what is the maximun voltage emitted by the sensor HCSR04, if the amplitude of the signal is 5 volts, could it damage my board?

Have you tried your code with a real sensor and a mbed, did you have any problem?

Question relating to:

Ultrasound Ranging Sensor module sensor, Ultrasonic Ranging, Ultrasound Sensor

1 Answer

10 years, 7 months ago.

You have an LPC1768, it is 5V tolerant: 5V signals will not damage it. Since most 5V sensors also accept 3.3V as high voltage, you can directly interface with 5V sensors.

Do take care this is not the case for all devices, the Nucleo ones are mostly 5V tolerant iirc, the Freescale ones aren't.