On which port is connected the Buzzer ?

polihedron / DIY-Reflow-Oven

DIY Reflow Oven, mcu: STM32F103 dev board, Display: Nextion Basic 3.5", PID controller.

BSD 3-Clause "New" or "Revised" License

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On which port is connected the Buzzer ? #2

Closed joelv1964 closed 3 years ago

joelv1964 commented 3 years ago

Hi Polihedron, I have not yet started building my oven or its control electronics. I really appreciate your idea of adding a Buzzer, but can you tell which port of the STM32 it is connected to and if it is connected directly to it? Thank you in advance for your answer. Joel

polihedron commented 3 years ago

Hi there, soon I will update schematics to my mod. Buzzer is connected via one of the 4 channel level shifter module mosfets to PA15. (Need to remove one of the resistors and cut the trace on the pcb.) But I belive it's not necessary if buzzer when active consume less than 20mA, I just didn't want to leave any mosfet useless.:) IMG_20210704_104110_cr

joelv1964 commented 3 years ago

Great ! thank you so much. I hadn't thought of using the second part of the shield ... Have a good day !

daestx commented 3 months ago

Maybe just an additional comment for the level shifter modification, when you would just like to use it as Mosfet to switch the Buzzer 5V. Here you can find a standard level shifter schematic:

So, in principle you need just to cut the LV connector and remove R4. LV1 pin needs to be connected to GND