https://pihrt.com/elektronika/391-moje-wifi-esp8266-merkur-battle-tank

Tank is controlled by a mobile phone, tablet, or laptop, for example, via a web browser with a Wi-Fi connection. After inserting two pieces of 1.5V AA batteries into the battery holder and wire connection + 3V and -3V the OLED display will show the name of the Wi-Fi network (eg: TANKxx), a password for access (eg: 123456789), the IP address of a website for the event that alone does not open the web browser when connected to Wi-Fi (eg: 192.168.4.1). Further, the OLED display shows the status of motor control (forward, reverse, stop, waiting for command) and the state of the bumper. Power of the power part is solved 3ks 1.5V battery (type C) thus 4.5V. Wires from the battery holder is connected to the screw terminals marked +6 and -6 V. Terminals M and M joins drive motor, parallel motor connects two bulbs 2.5V connected in series (lamp lights when the tank moves forward / backward). The terminals K and K engaging the bumper (switch formed by screws, which when the obstacle vehicle is stopped). After power has lit the red LED marked 3VOK 6VOK and, in the case of turning the power supply wires are shorted batteries! On board are diodes that prevent "fire" electronics. When entering the tank at the forward reversing command, rotate each wire extending from the motor to the plate (indicated by M and M).