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Results tagged with Search options user 51117

For questions about NodeMCU, an open source IoT platform which includes firmware for running on the ESP8266.

0
votes
1answer
I'd like to connect a 12V access control device to the Arduino, but I lack the understanding. How can the signals from and to the device be done when they have different voltages? I am afraid th …
asked Nov 11 '18 by Ivan
0
votes
1answer
I'm using a NodeMCU, and a working code for reading Wiegand data, with this library. I managed to successfully read the Wiegand signal from this device. However, I also have this new AR-721H device …
asked Jul 31 by Ivan
0
votes
3answers
I have a YL-44/MH-FMD passive piezo buzzer hooked up to an ESP8266/NodeMCU. It's connected like this: Buzzer ---> NodeMCU - GND ---> G - VCC ---> 3V - I/O ---> D2 This code makes a clear beep …
asked Nov 11 '18 by Ivan