Introduction: How to Monitor Ultrasonic Distance With ESP8266 and AskSensors IoT Cloud
This instructable presents how to monitor the distance from an object using ultrasonic HC-SR04 sensor and ESP8266 node MCU connected to the AskSensors IoT cloud.
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Step 1: Material We Need
We will need the following Hardware:
- ESP8266 Node MCU
- Ultrasonic HC-SR04 Sensor
- Bread Board
- Jumper wires
- Micro USB cable
Step 2: Build Your Hardware
Connect the ultrasonic sensor to the ESP8266 node MCU:
- HC-SR01 TRIG pin to ESP8266 D1 pin
- HC-SR01 ECHO pin to ESP8266 D2 pin
- HC-SR01 VCC pin to 5V (you can also try with 3.3V)
- Ground to ground
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 TRIG and ECHO pins and the ESP8266 pins. However, for production, a 3V3/5V level shifter is needed (check this page).
Otherwise, The ESP8266 is compatible with HC-SR 3V3 version and no level shifter is needed in this case.
Step 3: AskSensors Setup
- Get a free account at https://asksensors.com/
- Sign in and create a new Sensor.
- Copy down your Sensor API KEY IN.
Step 4: Download the Code
Download the code from the AskSensors github Page.
Decompress it and fill the following informations:
const char* wifi_ssid = "...................."; // SSID const char* wifi_password = "...................."; // WIFI const char* apiKeyIn = ".................."; // API KEY IN
Step 5: Run the Code
Connect the ESP8266 to your computer and upload the code.
Now, Go to your AskSensors dashboard.
Open your sensor page and add a new graph to visualize your data stream in real time as shown in the enclosed figure.
1 Person Made This Project!
- Miatadude made it!