Finger_LockV3.0

Project Description

This is a fingerprint lock that can be used in dormitories. It is equipped with fingerprint unlocking and APP remote opening functions without destroying the original structure.

Project function introduction

• The power supply part uses a Panasonic 18650 lithium battery;

• The onboard relay UPS circuit allows the dormitory to still be used normally after a power outage (external power supply is used during the day and lithium battery power is used at night);

• Use the MG995 40kg servo to install the rocker arm to drive the door handle to rotate to open the door;

• Use TPS61088 boost circuit to power the servo (the first version uses SX1308, which will cause insufficient current and chip protection);

• Using TPS63020 as a 3.3V power supply chip can maximize battery power, with high efficiency and low static power consumption; ~~~~

• Use 0.87-inch OLED to reduce the size as much as possible;

• The ESP8266 and JDY25M pads are reserved to enable the APP to open the door or link the network with other devices;

• Both the servo and the AS608 fingerprint module have MOS to control the power supply, reduce power consumption and extend standby;

• The purchasing link is as follows

• Servo: https://item.taobao.com/item.htm?spm=a230r.1.14.33.57c964aacZd9bW&id=578505252140&ns=1&abbucket=11#detail

• Servo bracket: https://item.taobao.com/item.htm?id=609404704946&ali_refid=a3_420434_1006:1123524089:N:HiQgKVvM%2FZ%2F4FmpTJtc9CA%3D%3D:11bc044e98dbb511a5a5fed8ba ca396a &ali_trackid=1_11bc044e98dbb511a5a5fed8baca396a&spm=a230r.1.1957635.32

• Fingerprint module: https://item.taobao.com/item.htm?spm=a230r.1.14.22.420d9520Vk0uso&id=566648022446&ns=1&abbucket=11#detail

• Connecting cable (8P, sh1.25, double-ended reverse): https://detail.tmall.com/item.htm?id=624732974819&spm=a1z09.2.0.0.137f2e8d741ufc&_u=i2qflid3663c

• 

• As shown in the picture, please unplug the leftmost cable before use, that is, only 7P is used! ! ! ! !

• • -

Project properties

• [x] Schematic design

• [x] PCB diagram design

• [x] PCB proofing

• [x] Welding test

• [x] Functional testing

• [x] Program testing

• • -

Circuit explanation

Power supply switching circuit

Steering gear control circuit

OLED drive circuit

Battery protection circuit

software

while(1)
{
    VBAT=ADC_DMA_IN5*3.3*2*100/4096;
Jansson1_Demo(USART1_RX_BUF);
    JDY_Read();

if(Finger_touch==1)
{
OLED_GO();
if(powertime<=50)
{ 
Power_finger=0; 
Power_servo=1;

powertime++;

}
else
{
Finger_touch=0;
powertime=0;
}
delay_ms(100);
if(Finger_touch==1 && openflag==0 )
{
press_FR();
}
}

else
{
     Power_servo=0;
     Power_finger=1;    
}

OLED_GO();

}
}

Equipment diagram

Demo video

Dormitory version WIFI fingerprint lock-Bilibili