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DC 5V 12V 4/8 Channel Relay Module High Low-Level Trigger with Optocoupler Isolation Relay for Arduino ESP8266 WiFi Relay Module Features: 1. The mobile phone is directly mounted on the WIFI module, there is no limit on the number of connected mobile phones, and multiple mobile phones can be controlled 2. In an open environment, the maximum transmission distance when the mobile phone is mounted on the WIFI module is 80 meters. 3. The single load current of the neutral relay does not exceed 2A, and the single load current of the single relay does not exceed 10A. 4. Since all 4 relays need about 0.5A current to pull in, and the instantaneous current to pull in exceeds 1A, the current output capacity of the power supply must be greater than 1A. It is recommended to use a power supply of 2A or above. 5. The IP address of the relay module is 192.168.4.1, and the password is abcd9527. The current program version address and password cannot be modified. Popularization of relay knowledge: Relays are generally composed of an iron core, coil, armature, contacts, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby producing an electromagnetic effect. Under the action of electromagnetic attraction, the armature will overcome the pulling force of the return spring and be attracted to the iron core, thereby driving the armature to The moving contact and the static contact (normally open contact) closed. When the coil is powered off, the electromagnetic attraction also disappears, and the armature will return to its original position under the reaction force of the spring, causing the moving contact to attract the original static contact (normally closed contact). In this way, it is attracted and released to achieve the purpose of conducting and cutting off the circuit. The "normally open and normally closed" contacts of the relay, can be distinguished as follows: the static contact in the di