Water Tank Level Indicator with Low Level Warning Notifications

Projects made with Blynk
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If you want to use the original code, then this is how to connect your sensor to your D1 Mini:

#define echoPin 14 // Echo Pin      <--------- Pin D5 on Wemos D1 Mini
#define trigPin 12   // Trigger Pin <--------- Pin D6 on Wemos D1 Mini

If you want to use the connections you’ve specified, then change the code to this:

#define echoPin 2  // Echo Pin      <--------- Pin D4 on Wemos D1 Mini
#define trigPin 0  // Trigger Pin   <--------- Pin D3 on Wemos D1 Mini

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However, using pin D3 (GPIO0) isn’t a good idea, and pin D4 (GPIO2) is connected to the builtin LED, which also isn’t a good idea.

See this post for more info…

Pete.