In this work, we address the simulation of remote monitoring and control of pH, oxygen level, temperature, and luminance in an aquarium. We used the online simulator Wokwi to construct the circuit, and the Blynk app for remote control. The development was carried out in stages, starting with individual tests of sensors integrated with the ESP-32 hardware, followed by the complete integration of the sensors. Some sensors, such as pH and oxygen sensors, needed to be built in the simulator due to the absence of these components in Wokwi. In this context, we present the solutions we found to optimize the functionality of Wokwi when used with Blynk.