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How is a smart door lock connected to NodeMCU?
Connections for this IoT Smart Door Lock are very simple as we are only connecting a solenoid lock, relay module, and a buzzer with NodeMCU ESP8266. The input pin of the relay is connected to the D5 pin of NodeMCU while VCC and Ground pins are connected to Vin and GND pin of NodeMCU.
Which is the GND pin for NodeMCU buzzer?
GND pin/ Black wire to the GND. Similarly, Buzzer Negative Terminal is connected to GND and Positive terminal to D8 Pin of NodeMCU. Now Red and Green both LEDs Negative Pins are Grounded. while the Positive terminal of Red LED is connected to SD3 pin, and Green LED to SD2 Pin of NodeMCU.
Can a DECT be turned into a doorbell?
Box to turn a DECT handset into a mobile doorbell. The special features of the ESP8266 make it the perfect component for this project. It has WiFi capabilities, consumes less than one mW in deep-sleep mode and is easy to program. There’s also a broad developer community that provides good tool support and resources.
How to connect NodeMCU to Adafruit Io dashboard?
Once the hardware and code are ready, connect the NodeMCU to your laptop and upload the code. After that, open the Adafruit IO dashboard and toggle the button to open and close the gate. A complete working video and full code are given below. // Stop if already connected.
How is the relay connected to the NodeMCU?
The input pin of the relay is connected to the D5 pin of NodeMCU while VCC and Ground pins are connected to Vin and GND pin of NodeMCU. The positive pin of the buzzer is connected to the D6 pin of NodeMCU, and the GND pin is connected to the GND of NodeMCU. I have soldered all the components on Perfboard as shown in the below pictures:
How can I tell if my NodeMCU is connected to WiFi?
This function provides the status of the wifi. when we call this function it will return certain value which helps us to know weather NodeMCU is connected to wifi , disconnected to wifi , or waiting for connection.