Minimal access control system board based on ESP12S

Using ESP12S to pull the servo installed on the door to open the door, the access control board burning program requires a USB to TTL module, which is inserted into the 4 pins above the relay, and the switch is set to download mode, and the power switch Close The pins connected to the servo are on the upper left, the left is the relay and voltage regulator chip, the middle is the ESP12S and switch, and the right is the integrated boost and charging circuit (similar to a UPS), so it can be used normally even if the power is cut off at night. With the lighting technology and the following code, remote control can be achieved. Even if the network is disconnected, you are not afraid. You can connect to the WiFi sent by the ESP12S itself for LAN control. In addition, the ADC function of ESP12S is used to measure the voltage, and an optocoupler is used to detect the charging status and feed it back to the APP. In addition, ESP12S also has two LED lights, LED4 and LED5. LED4 is the WIFI status and will light up when there is no WIFI connection. , LED5 is the network status. It will light up when there is no network. LED4 will light up in download mode. The specific status indication corresponds to the following table.