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How to wire ESP8266 NodeMCU with hcsr04 ultrasonic raging sensor?
In this illustration we will going to wire the ESP8266 12E nodeMCU with Ultrasonic Raging Sensor HCSR04. As you can see the illustration below the sensor trigger pin is connected to D1 which is pin 5 in Arduino Board, and the ECHO is connected to D2 which is pin 4 in Arduino Board.
What kind of wifi does the ESP8266 have?
The ESP8266 is a great inexpensive device that gives you WIFI connectivity as well as a couple GPIO ports to connect sensors. In this project I will outline the following:
How to upload data from a dht11 temp sensor?
Connect the ESP8266 to a USB to TTL Serial adapter to enable you to program the ESP8266 using the Arduino IDE. Upload code to take a reading from a DHT11 Temp/Humidity sensor and upload that to Adafurit IO using MQTT. Connect the USB to Serial adapter and the sensor to the ESP8266 as outlined in the picture.
How to connect ESP8266 module to serial adapter?
Once you have the IDE downloaded and installed, connect a USB cable from your laptop/PC to the serial adapter and select the “Generic ESP8266 Module” from inside the IDE. Then select the port. One note, the USB to serial adapter was automatically recognized by my Mac so I didn’t have to search for a driver.
Is the ESP8266 compatible with HC-SR 3v3?
However, for production, a 3V3/5V level shifter is needed ( check this page). Otherwise, The ESP8266 is compatible with HC-SR 3V3 version. The provided code has been tested and should work as is. All you need is to set the following parameters:
How to monitor the distance using an hc-sr04 ultrasonic sensor?
How to monitor the distance using an HC-SR04 ultrasonic sensor and ESP8266 NodeMCU connected to the AskSensors IoT cloud. This Project aims at measuring the distance using an ultrasonic sensor HC-SR04 and an ESP8266 WiFi module.
Do you need a level shifter for the ESP8266 GPIO?
Note:The ESP8266 GPIOs require 3V3 signals (not 5V tolerent). For quick hack, if you are using the HC-SR (5V version), we highly recommend to add a serial resistor between the HC-SR Echo pin and the ESP8266 GPIO. However, for production, a 3V3/5V level shifter is needed ( check this page).