C Control systems for electronic equipment such as lights, especially in high-rise buildings such as campuses, are controlled from certain spaces on the distribution panel via cables. But the locking and opening of the doors in each class is carried out by officers by visiting each class. In addition to on / off the AC using the remote. With this background, the author wants to design a wireless on/off control device for lights, air conditioners and electric locks in classrooms in order to help the officers do their job. The tool used is capable of two-way communication using Amplitude Shift Keying (ASK). For two-way communication there are two transmitters that use the same working frequency and there are also two receivers. The tools designed are divided into two parts, namely tools in the control room and tools in the classroom, using ASK transmitter and receiver modules in each section. This tool can be applied in addition to classrooms, it can also be applied to hotels, offices, and others. The device in the control room functions to control the lights, air conditioning, and electric locks in the classroom. The ASK transmitter module in the control room functions as a sender of commands to the ASK receiver module in the classroom using a 4 x 3 matrix key pad to control lights, air conditioners, and electric keys. The wireless circuit will always wait for incoming data in the form of commands to scan the la710u, AC, and open the door. If there is incoming data in the form of il$erMUll then the above conditions are carried out. The ASK transmitter module in the classroom serves as a sender of replies to the ASK receiver module in the control room then the status will be displayed on the LCD display. Furthermore, the microcontroller will always wait for the entry of command data on the contrary, namely the entry of commands to turn off the lights, air conditioner, and lock the door. If there is incoming data in the form of the command, the above conditions are carried out. From the measurement results in accordance with the desired tool design so that the tool can work properly and correctly.