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The best way to use and learn about the ESP-201 is by using the SDK that it was designed for. The SDK has 2 LEDs, a buzzer, a DHT11 and a SPDT relay rated at 10 amps. All signals have pinned breakouts so you can prototype with them off of the board. I have downloaded to it using the Arduino IDE 1.6.4.
For $15 you can not beat it. I reordered and now have a total of 3.