/products/arduino/arduino-projects/b/blog/posts/capacitance-meter-prototypeCAPACITANCE METER PROTOTYPE This is my first proyect, a capacitance meter prototype of capacitors with Arduino. As we know, the Arduino digital pins have an output voltage of 5 volts, we are going to take advantage of this voltage and th...en-USTelligent Community 12https://community.element14.com/products/arduino/arduino-projects/b/blog/posts/capacitance-meter-prototypeSat, 08 Jul 2023 18:11:28 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:74527444-91dd-43fb-baf8-c8c347230551DAB1<p>Very good first project.</p><img src="https://community.element14.com/aggbug?PostID=26441&AppID=149&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/products/arduino/arduino-projects/b/blog/posts/capacitance-meter-prototypeFri, 07 Jul 2023 16:31:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:74527444-91dd-43fb-baf8-c8c347230551shabaz1<p>This is quite a complex first project!</p> <p>One thing worth modifying is to add a MOSFET to perform the discharge operation rather than use the GPIO pin as output set to 0V. When you set the GPIO pin in that way, a tiny MOSFET inside the microcontroller switches on. The MOSFET cannot handle the high current from the charged capacitor and may eventually blow. So, to protect that tiny MOSFET, you can either add a resistor to reduce the discharge current or add an external MOSFET (google &#39;mosfet open drain&#39; to see examples of how to wire that.</p><img src="https://community.element14.com/aggbug?PostID=26441&AppID=149&AppType=Weblog&ContentType=0" width="1" height="1">