Technical Guide

For ultrasonic sensor Connection pin_ Echo-2 Trigger-3 Vcc-5v Gnd-Gnd ______________________________________________ All negative leg of led to Gnd of arduino And positive leg of leds are pin number 4 to 11 of arduino respectively  

Hardware set-up: Connection pin trigger: D0     Echo:  D2                   Vcc: Vin or 3 v       Gnd:Gnd Systematic diagram_ _____________________________________________ Application set-up:_ Download blynk application from play store or app Store Sign up in the application by providing email and password After login _ Follow these steps to setup this project:_ Create new project in blynk        Name the project, select proper board (nodemcu), connection type Wi-Fi Click on ok button                          Click on (+)add icon to add widget Scroll down to select led widget  Name the led(empty), seclect virtual pin v0 choose the specific colour as you want,and go back Similarly as above name the led (low), select virtual pin v1,and choose colour and go back.                  ...