NodeMCU build: buzzer sounding continiously

[lhw455]

Hi all, thanks to Ray for the fantastic product. I decided to do a DIY to teach myself a little about electronics and decided to build the one described in this thread over at HASS (https://community.home-assistant.io/t/opengarage-open-source-wifi-garage-opener/17228/) – I built it using NodeMCU v3 following the wiring diagram in that thread.

The only problem I have is that the buzzer is sounding continuously. When I request a door open, I can hear the sound coming through over the continuous buzz.

Any ideas?

[Ray]

First of all, the buzzer is there for compliance reasons (sound alarm is required for automated garage door controller), and if you build it DIY you don’t necessarily have to use the buzzer.

Second, you should check the buzzer’s spec — is it an active low or active high type? The OpenGarage circuit uses an NPN transistor to switch the buzzer, and it’s active high (which means a high signal turns on the buzzer and low signal turns it off). If your buzzer is the reverse (some buzzer modules are active low type, because they use a PNP transistor), then the logic is reversed, and that explains why it’s buzzing continuously.

[lhw455]

Thanks, I’ve temporarily removed the buzzer.

It’s this one. I’ll try and reverse the connections and see how it goes.

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.Xarduino+310mhz+rf.TRS0&_nkw=9012+buzzer&_sacat=0

[Author]

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