Hi Guix. I was using an Arduino Uno to send sensor data to NodeMCU. And the NodeMCU is to receive the data from the Arduino Uno and then update it to the IoT platform. So here at the dashboard, I added a switch, and I expect to use this switch to return a value of 1 or 0 to my NodeMCU. Then, NodeMCU will send the "0" and "1" to the Arduino Uno. So If the Arduino Uno receives a "1" it will turn on the LED connected to it. If it received a "0" it will turn off the LED. I cannot connect the LED directly to my NodeMCU, because it outputs only 3.3V. So, I wanted to Arduino Uno to receive the "1" and "0" from iot cloud through NodeMCU to power up my led. (LED in this case is a RGB strip that operate at 5V). Is there any suggestion from you I can do this?