Article 7: Design of multifunctional intelligent trunk following control system | undergraduate graduation project - [module device selection, list and data]

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One 、 Device purchase list （ There's redundancy ）

Serial number	name	Model and specification	The unit price	Number	The total price ( Including discounts or freight )	Purchasing chain	remarks
1	Fingerprint unlocking module	MR608 Capacitive	65.3	1	145.69	Tmall _ Lvshen flagship store
2	USB turn TTL	-	3.28	1		Tmall _ Lvshen flagship store
3	Buzzer module	passive , Low level trigger	0.78	2		Tmall _ Lvshen flagship store
4	Weighing module	20kg	25	1		Tmall _ Lvshen flagship store
5	HX711	Small size	2.15	1		Tmall _ Lvshen flagship store
6	Laser sensor	GY-530 VL53L0X	16	3		Tmall _ Lvshen flagship store
7	OLED Display module	1.3 " 4 The needle IIC Interface （ The blue words ）1306 drive	22.80	1	61.67	Tmall _ Lvshen flagship store
8	OLED Display module	0.96 " 4 The needle IIC Interface （ The blue words ）1306 drive	12.80	1		Tmall _ Lvshen flagship store
9	Hole board	Two-sided 9*15cm	4.80	3		Tmall _ Lvshen flagship store
10	Hole board	Two-sided 3*7cm（2 slice ）	1.60	4		Tmall _ Lvshen flagship store
11	Tap the switch	665 （20 only ）	1.98	1		Tmall _ Lvshen flagship store
12	DC-DC Power module	​	2.50	2		Tmall _ Lvshen flagship store
13	12V Lithium battery pack	2800mAh	39.8	1	54.8	Tmall _ Qisuo flagship store	（ Instead of fast charging ）
14	Lithium battery charger	12.6V2A	15	1		Tmall _ Qisuo flagship store	（ Instead of fast charging ）
15	Gimbal wheel	W001# Large steamer	8	2 Yes	16	TaoBao _ Yongfeng luggage accessories
16	The motor	520 Encoder decelerates	49.9	2	142.40	TaoBao _ Yabo Intelligent Technology
17	Motor fixing bracket	520 The motor	3.8	2		TaoBao _ Yabo Intelligent Technology
18	Bracket screw	M3 5mm 10 individual	0.23	12		TaoBao _ Yabo Intelligent Technology
19	tire	65mm	10.9	2		TaoBao _ Yabo Intelligent Technology
20	copper pillar			A number of		TaoBao _ Yabo Intelligent Technology
21	Power module	3.3V 5V	5.53	3	16.04	TaoBao _risym Flagship store
22	Resistance strain half bridge sensor	50Kg	4.99	8	39.92	TaoBao _risym Flagship store
23	High decibel alarm	SHD4216 Active power	3.52	1	3.52	TaoBao _risym Flagship store
24	AMS1117	AMS1117-3.3V encapsulation SOT223;AMS1117-5.0V encapsulation SOT223	4.84	2	9.68	TaoBao _telesky Flagship store
25	Temperature regulating electric iron	Internal heat 60W Temperature regulation （ Smart chip + Quick heating and constant temperature ） Standard configuration	12.42	1	12.42	TaoBao _ Gold boss hardware store
26	The iron head	Conventional tip , Small font , Medium horseshoe type	3	3	9	TaoBao _ Gold boss hardware store
27	Integrated ultrasonic ranging module	JSN-SR04T	25.00	2	50	Sindh electronics
28	Small pull ring scale	50Kg, precision 0.1Kg	13.90	1	13.90	Kaifeng flagship store
29	PI Golden finger high temperature adhesive tape	8mm wide *30 code （1 Volume price ） Small volume	3.20	1	18.40	Xinhongsen industrial materials wholesale
30	PI Golden finger high temperature adhesive tape	20mm wide *30 code （1 Volume price ） Small	8.00	1		Xinhongsen industrial materials wholesale
31	Transparent double-sided tape	10MM wide *3 Meters long （ Small volume ）	10	1		Xinhongsen industrial materials wholesale
32	Finished electronic scale	20KG sensor +HX711 modular + Tray 1 set	21	1	25.00	Shenzhen zhuoye Technology Co., Ltd
33	Glue gun	white 20W Hot melt glue gun apply 7mm Left and right glue sticks	8.90	1	40.48	Xinwei flagship store
34	Weighing display module		15.70	1		Xinwei flagship store
35	Level conversion module	2 Circuit level conversion （ Bent needle ）3.3V-5V 5V-3.3V	1.15	2		Xinwei flagship store
36	Hole board	5*7cm（ Two pieces ）	1.12	4		Xinwei flagship store
37	Hole board	10*22cm（ a slice ）	3.20	3		Xinwei flagship store
38	Aluminum alloy profile		9	2	60	Oliva flagship store
39	Aluminum alloy profile parts	2020 Three dimensional corner connector （ Including jackscrew ）	3.5	8		Oliva flagship store
total			​		718.92

Device purchase list .xlsx

Two 、 Device data

2.1 Fingerprint unlocking module √

• Buy links ： Tmall 1_ Lvshen flagship store
• model ：AS608 + TTL
• Reference video ：
  • 100 Yuan makes dormitory fingerprints to unlock access control （ZW1）

Existing problems ：

• Advantages and disadvantages of optical fingerprint and capacitive fingerprint
  • as608 The principle of fingerprint module _ How much do you know about fingerprint lock and fingerprint identification technology
• The use environment of the luggage compartment

matters needing attention ：

• AS608 This module has been used for a long time , Or the recognition rate is very low when the glass is dirty ,, Don't ask me how I know . The operation demonstration uses the optical version AS608 This problem was also discovered later So it was finally changed to the capacitive title AS608 The performance of recognition rate and recognition speed is much better

2.2 Over distance alarm technology （√）

Scheme 1 、 Ultrasonic distance alarm
Option two 、RFID
Option three 、UWB Positioning and ranging
The difference between active buzzer and passive buzzer ？
Buzzer ： Tmall _ Lvshen flagship store

2.3 Intelligent weighing technology √

• Buy links ：
  • HX711AD： Tmall _telesky Flagship store
  • Body scale 50kg_risym Flagship store
  • Body scale 50kg_TELESKY Flagship store （ Text description available ）
  • 40kg Pressure sensor
• model ： The weighing sensor + HX711AD modular

​

Reference video ：

• 0-5Kg Load cell assembly video tutorial （ contain HX711-AD Conversion module ）-DIY Development board Suite

Reference tutorial

• Information required for model selection of load cell

2.4 Position follow

• uwb
  • Buy
    • UWB High power wireless ranging indoor positioning base station module development board AGV Navigation DW1000 Materials tutorial 320
    • DW1000PA+LNA/UWB High power wireless ranging module ultra wideband test centimeter level positioning module 150 Pure module
    • DWM1000 Imported original goods in stock Positioning module Ultra wideband indoor positioning module UWB Positioning module 115 Pure module
  • Information
    • 【UWB location 】 - DWM1000 Simple experience of module debugging - 1
    • 【UWB location 】 - DWM1000 Simple experience of module debugging - 2
    • 【UWB location 】 - DWM1000 Simple experience of module debugging - 3
    • DW1000 Way of learning （ One ） -------- Use DW1000 send data

2.5 Avoiding obstacles √

• GY-VL53L0X
  • GY-VL53L0X Information
  • Test video ：
    • VL53L0x Cheap laser ranging chips arduino Use the tutorial _B standing
    • DIY Simple and easy 3D scanning - be based on arduino VL53L0x
• TOFSense Laser ranging sensor
  • TaoBao _Nooploop Empty cycle
  • TF-Luna 8m Micro laser ranging sensor _ Pan Lei flagship store

2.6 Power drive module √

Type of motor required ：

Code the reduction motor

Reference resources ：

• What is the torque of the stepping motor NM If you translate it into kgcm Words , How much is the
• How to select the drive motor on the smart car ？ To calculate the power and torque of the motor , How to calculate ?
  • Don't consider acceleration and deceleration first , You can first calculate the torque required when the car moves at a constant speed , The friction multiplied by the radius is the torque it needs , Torque times angular velocity is the power of the car , Then select the motor and the corresponding reducer （ If the torque meets the requirements, the reducer may not be used ）. After selecting the motor and reducer , You need to verify that the motor meets the requirements , For example, inertia matching , Speed matching , Torque matching, etc . Of course, the process can be reversed , Finally determine the motor model .
• The relationship between automobile tire radius and friction force
  • The rolling resistance moment is related to the dynamic moment , The dynamic moment is equal to the product of the tire radius and the external force at the contact point .
  • The formula for calculating friction F=mgu, among mg Is the gross vehicle weight ,u It's the coefficient of friction , This force is constant as long as the tire material and road material are certain , It has nothing to do with the radius
• Rolling friction coefficient of automobile tire
  • Rolling friction coefficient of the tire on general asphalt or concrete pavement 0.018-0.020

Motor specification calculation

Calculation of the required torque of the motor

Torque calculation of motor ： Motor's “ torque ”, The unit is N·m（ Cattle meters ） The formula is T=9550 * P / n .
P Is the motor rating （ Output ） The unit of power is kW （KW）
The denominator is the rated speed n The units are revolutions per minute (r/min)
P and n Can be obtained from It can be directly found in the motor nameplate . because P n It is the rated value of the motor , so T It is the rated torque of the motor .
Reference resources ：
Composition and force analysis of vehicle running system
under advisement , The following drive system of the trunk is analyzed by using the force analysis method in the driving process of the automobile .

Motor rated power calculation

Motor speed calculation

Motor selection

	remarks	voltage	Speed type	Maximum torque	Price
520 Encoder reduction motor	More information Big torque	12	11000/30=366	10kgf.cm	49
JGB37-520 Encoder reduction motor		6/12	7 ~ 1000;12~1590	0.5~24; 1 ~ 31	36
25GA-370 Gear motor	67mm wheel	6/12/24	12~ 1360;12~1360	0.1~9.0;0.1 ~9.0	25
JGB37-520 Encoder motor	67mm wheel	6/12	7~1000; 12 ~1590	0.4~35; 0.7 ~35	40
555+ Reduction gearbox + Encoder	8000r/s;1:10; Completely custom

explain ：

• People walk faster 0.9m/s
• Human running speed 2-5m/s

Reference speed ：

Tire selection ：

Drive wheel wheel diameter : 5.5cm

Luggage compartment universal wheel

model
The diameter of ：4.2-6cm , selection 4.8cm
TaoBao ：W001# Large steamer

Content ： The diameter of the universal wheel of the trunk is generally 4.2-6cm Between , Select... Here

Lift control

Scheme 1 、 According to the weight of the items in the box , There is a linear spring that changes the pressure on the wheel
Option two 、 Using the principle of aircraft landing gear

2.7 Power module √

• USB Two way fast charging

  • USB Two way fast charging module ：
    • Two way fast charging module of power bank Move the power supply motherboard 3.7V turn 5V9V12V boost
    • PD Two way fast charging circuit board Module mobile power chip Charging treasure 5v Boost main board QC3.0

• The lithium battery

  • 12V Volt lithium battery pack 2200mAh（ Instead of fast charging ） Tmall _ Qisuo flagship store
  • 12V V lithium battery pack with charger 12.6V2A Tmall _ Qisuo flagship store

2.8 framework √

Screw

copper pillar

wood

Aluminum alloy profile