The electronic circuit is designed to control the device Selfie Bot. This scheme allows you to communicate with the device via Bluetooth and control two servos. To control device intended SelfieBot Droid program. Thus, SelfieBot Firmware software must be installed on the device microcontroller Base.
The device is powered from an external power source voltage of 12V, able to give at least 1A. external power line protected by a fuse nominal value of 1A. DC-DC converters D1 and D2 are organizing two channels of power: the microcontroller and D3 Servo SRV1 and SRV2. Converters are adjusted so that the microcontroller and Bluetooth D4 D3 module is fed 5V, 7V to the servos served.
Microcontroller D3 is connected to the Bluetooth module for the D4 UART interface via the appropriate conclusions, available in both modules. Through the resistors R2 and R3 outputs D5 and D6 D3 of the microcontroller pins are connected to the control on the connectors, which are connected servos.
Login RST microcontroller D3 pulled up to the power supply line + 5V via a resistor R1 and a removable jumper JMP1. Bluetooth D4 module via removable peremychkuJMP2 connected to + 5V line. In normal operation and JMP1 JMP2 device jumper must remain in place. When programming the microcontroller and D3 JMP1 JMP2 jumper removed.