Review on 🔷 DIGITEN 4 Digital LED Tachometer RPM Speed Meter with Hall Proximity Switch Sensor NPN in Blue by David Dreher

Everything works and looks great but there was a problem. With the 12V VDD I was only able to get a 2.5V output pulse on the output leg of the sensor. This works to enable the display function, but I wanted to disconnect to generate a velocity input for my CNC controller so I can run closed loop velocity control. It wasn't enough to trigger the sensor on my controller. I used a stronger smaller magnet and adjusted the position of the sensor, but it looks like the output voltage is still limited to 2.5V. Does somebody has any idea? I'm under the impression that the hall switch should conduct full VDD when the magnetic flux crosses a threshold, and I'd rather not build an op amp to increase the output. But it works well and looks cool. As mentioned, it takes 3-5 seconds to return to 0 after stopping.