Programming The Esp-01S Relay Module - Joy-it ESP-01S Quick Start Manual

2. PROGRAMMING THE ESP-01S RELAY MODULE

To use the ESP-01S relay module, you must first program the ESP-01S
supplied on the product.
For this, we recommend programming the ESP-01S with the ESP8266
PROG from 3.
First, the Arduino development environment must be prepared for use
with the ESP8266.
To do this, the following URL is entered in the global settings of the pro-
gram as an additional board administrator URL:
https://arduino.esp8266.com/stable/package_esp8266com_index.json
Next, an additional board library must be installed. Open the board ma-
nager and install the ESP8266 library.
Please note that your Arduino development environment must be
restarted if the board library is not displayed.