STONE Tech is a manufacturer of HMI display module(Intelligent TFT LCD). We provide LCD modules/LCD Displays, Graphic LCM, smart Display LCD, TFT LCM, Custom LCD Module Display, and LCD panels. china LCD Manufacturers.

1. Screen in the e-bike display control
Applications in terminals
-Create a civilian’s Tesla driving experience
Ⅰ
.summary
By the end of 2019, the number of electric bicycles in China has reached 300 million, becoming an
indispensable transport in the lives of the general public. However, the original dashboard is very
simple, and the only information provided is electricity, speed and steering, which can no longer
meet the requirements of people pursuing quality of life in the information explosion era.
In this paper, we develop a powerful display and control terminal for electric bicycles. The program
uses STONE-STVC070WT-01 HMI screen as the display control platform, and based on the
C8051F340 chip developed a set of data acquisition, processing terminal, integrated a variety of
sensor technology, to create not only can provide speed, power, steering information, and
additional RTC clock, heading, environmental temperature, mileage data and other information,
the user through the touch screen to complete the Driving mode and personalized lighting settings,
and the ability to automatically turn on the lighting system and other functions. TFT LCD
Let your car has the same as the Tesla, full of technology display control terminal.
Ⅱ.The realization of the function
Let’s show you our powerful feature list.
1. speed display function, display the vehicle speed from 0-100Km (basically will not be achieved),
the display is familiar and like the car dashboard, and with numbers intuitive and simple.

2. 2.Power display function, not simply mapping out inaccurate power information according to the
battery voltage, but through the lithium battery discharge curve to calculate the real energy
storage data, which is clearly shown to you through the battery icon and percentage data.
3.Turning information function, receives the user’s steering control information, on the one hand,
gives the steering tips on the display, on the other hand, drives the 5050 RGB light set, completes
the personalized turn signal drive work. TFT touch screen
4.RTC clock function, which provides accurate clock display function for your car, eliminating the
trouble of looking at your cell phone or watch while riding your bike, and also provides the safety
factor for your driving.
As a lady and program ape, you may have already got used to the city life, and gradually lost the
sensitivity to the direction, the program in this article will provide you with real-time direction
guide, refuse to find the embarrassment of the north. TFT display
6. Ambient temperature function, to provide you with 2 ℃within the accuracy of the ambient
temperature information, combined with the human body in the course of travel, timely addition
of clothing.
7. A variety of mileage data functions, providing cumulative mileage, single driving mileage,
battery remaining mileage data, you know your riding data like the back of your hand, but also to
avoid getting yourself into the embarrassment of a dead trolley.
8. Driving mode settings, through the HMI touch screen, the user can set the cruise mode, sport
mode, energy-saving mode, let you feel more than 300,000 B-class car mode experience.

3. 9. personalized lighting settings, also via the HMI touchscreen, where you can select your
preferred lighting and turn light modes.
Ⅲ .System principle and composition
The system mainly consists of two parts, the front-end display and control platform and the
back-end data acquisition and processing platform, the specific realization principle is as follows.
STONE HMI screen as a display control platform, receive various types of information sent from
the back-end data acquisition and processing platform, and its display on the screen through a
variety of controls, and at the same time on the user’s touch operation feedback, give the
corresponding instructions sent to the back-end data acquisition and processing platform.
The back-end data acquisition and processing platform communicates with the front-end platform
and EV control box through the UART port of C8051F340 chip; uses the IIC interface and UART port
to communicate with the on-board RTC clock module and DMC digital compass module to obtain
the current time and heading information; reads the battery voltage through the ADC peripheral of

4. the chip, calculates the electricity information through the discharge curve table, reads the battery
voltage, and then reads the battery voltage through the DMC digital compass module. Analog
voltage for speed, calculate the current speed and integrate the mileage data; the chip reads the
steering key information; and through the chip’s own temperature sensor, obtains the current chip
temperature information. The photoresistor is collected and the lighting is automatically turned on
according to the threshold value.
The system block diagram
Back-end system components: MCU, photosensitive module, RTC module, DMC compass module,
5050RGB module, battery level and speed acquisition module, communication module.
IV. System hardware design
1. Front-end hardware design of graphics control
1.1 STONE HMI Module
This paper uses HMI screen from Beijing STONEn Technology Co. model STVC070WT-01, which
integrates TFT display and touch controller. It includes processor, control program, drive, flash
Backend data acquisition
LED 灯 ADC
RTC DMC
Temp
ADC ADC
UART Power

5. memory, RS232/RS485/TTL port, touch screen, power supply, etc., which is a powerful and
easy-to-operate overall display system operating system that can be controlled by any
microcontroller. The user interface is enriched with features such as text display, image display,
curve display, and touch, video and audio playback. The built-in flash memory can store data,
configuration files, images and so on.
(1) STVC070WT-01 product features
-Controlled by any MCU.
-Display pictures/text/curves.

6. -65536 color TFT displays.
-With/without touch screen.
-RS232/RS485/TTL UART interface and USB port.
-Wide voltage range.
(2) Scope of application
Widely used in various industrial fields, medical and beauty equipment, construction machinery
and vehicle equipment, electronic instruments, industrial control systems, power industry, civil
electronic equipment, automation equipment, transportation.
1.2 Electrical connections.
(1) Power supply
The HMI screen is powered by a start-up current of 5V 600mA or more, which is generated in part
by the Buck buck buck circuit of the back-end data acquisition and processing platform, as shown
in the schematic diagram in the following section.
(2) Communications
The HMI display terminal uses UART port to communicate with the backend platform, because the
model I use is STVC070WT-01, suffix-X1 (X=0 RS232, X=4 RS485, X=1 TTL), so it communicates with
the TTL UART interface, the baud rate is set to 9600bps.
1.3 Development steps.

7. Using the STVC070WT-01’s TFT-LCD module requires only four steps.
(1) Designed a nice set of “graphical user interfaces” using TOOL-2019 development software.
(2) Downloading the edited GUI to the TFT-LCD screen through the debugging tool.
(3) Direct connection to the customer’s MCU via RS232, RS485 or TTL levels.
(4) Write a simple program on the MCU side to let the MCU control the TFT-LCD module (hex code)
by command and that’s it.
2. Hardware design of the acquisition console
2.1 Hardware circuit diagram and its description
(1) The main control chip adopts C8051F340 to draw out the required IIC, UART, GPIO, etc.
respectively.

8. (2) The system power supply uses LTM8073 chip as the primary power supply to convert 48V to 5V
output and LM1117-3.3V as the secondary power supply to convert 5V to 3.3V.
(3) RTC clock module, using PFC8563 clock chip, and with coin cell batteries as a backup power
supply, to ensure that the system’s real-time clock works properly for a long time.

9. (4) photosensitive module, battery power module, speed acquisition module, photosensitive
module adopts 5506 photosensitive resistor, the resistance is below 1k when sensitive to light, no
light is above 1M; the speed of the electric car is 1-3V analog quantity can be directly collected;
battery voltage is maintained between 42-48V, after 16 points of voltage control within 3V total
microcontroller ADC collection.
(5) Connectors have C2 interfaces, key interfaces,
(6) Left and right steering button connections.

10. 2.2 Main Control Chips
The C8051F340 is an 8051-compatible microcontroller core (up to 48 MIPS) with full-speed,
non-intrusive in-system debug interface (on-chip), USB function controller, integrated transceiver
and 1K FIFO RAM in a high-speed, pipelined architecture for mixed-signal system-on-a-chip
microcontrollers from Silicon, with the following resources.
Power regulator.
A true 10-bit 200 ksps single-ended/differential ADC with analog multiplexer.
On-chip voltage references and temperature sensors.
On-chip voltage comparators (two).
Precisely calibrated 12MHz internal oscillator and 4x clock multiplier.
Up to 64 KB of on-chip FLASH memory.
Up to 4352 bytes of on-chip RAM (256+4KB).
Hardware-implemented SMBus/ I2C, enhanced UART (up to two) and enhanced SPI serial
interfaces.
4 general purpose 16-bit timers.

11. Programmable counter/timer array (PCA) with 5 capture/comparison modules and watchdog timer
functionality.
It fully meets the system resource requirements of 3-ADC, on-chip temperature sensor, hardware
IIC and dual UART interface.
Ⅴ
.System software design
1. Front-end software design for display and control.
(1) Development process
First, create the project and load the required images into the project, the format of the main
images.
Second, create, using TOOL-2019 controls, dynamically associated relationships.
Third, software simulation, compilation and generation of executable files.
Fourth, connect the HMI screen to the PC via the debugging tool and download the executable file
to the screen.
(2) How to create a dashboard.
(3) How communications are handled, to be clear, to give instructions.
2. Acquisition console software design.
(1) ADC programming.
void ADC_REF_TEMP_Set(bit temperature,bit biase,bit vref_out)

12. {
if(VREF_SOURCE_SET==VDD_VALUE_3D3V)
{
REF0CN = (0x08) | ((u8)temperature<<2)|((u8)biase<<1)|(vref_out);
}
else if(VREF_SOURCE_SET==VREF_VALUE_2D4V)
{
REF0CN = ((u8)temperature<<2)|((u8)biase<<1)|(vref_out);
}
}
u16 ADC_Measure(u8 input_p,u8 input_n,u8 times)
{
u16 temp;
u16 accumulation;
u8 i;
u8 killwhile;

13. AMX0P = input_p;
AMX0N = input_n;
ADC0CF = 0xF8;
ADC0CN = 0x80;
temp=0;
accumulation=0;
killwhile=255;
Delay_ms(300);
for(i=0;i<times;i++)
{
AD0INT=0;
AD0BUSY=1;
while(!AD0INT&&(killwhile)){killwhile–;}
AD0INT=0;
AD0BUSY=0;
temp=(ADC0H<<8)+ADC0L;

14. accumulation+=temp;
Delay_ms(1);
}
temp=accumulation/times;
return temp;
}
float ADC_Calc_Volate(u16 MeasureValue,float Volate_Scale)
{
float temp;
if(VREF_SOURCE_SET==VDD_VALUE_3D3V)
{
temp=((float)MeasureValue/1024)*3.3;
}
else if(VREF_SOURCE_SET==VREF_VALUE_2D4V)
{
temp=((float)MeasureValue/1024)*2.4;

15. }
temp=temp*Volate_Scale;
return temp;
}
float Temperature_measure(void)
{
float temp;
u8 killwhile;
u8 times;
AMX0P = TEMP;
AMX0N = GND;
ADC0CF = 0xF8;
ADC0CN = 0x80;
temp=0;
killwhile=255;
Delay_ms(900);

16. for(times=8,temp=0;times>0;times–)
{
AD0INT=0;
AD0BUSY=1;
while(!AD0INT&&(killwhile)){killwhile–;}
AD0INT=0;
AD0BUSY=0;
temp+=(ADC0H<<8)+ADC0L;
}
ADC_REF_TEMP_Set(0,0,0);
temp = temp/8;
temp =
(temp/1024*VREF_SOURCE_SET-0.776)/0.00286;
return temp-Temperature_Offset;
}
void Single_Write_HMC5883(uchar Address,uchar Dat)

17. {
IIC_Start();
HMC5883_Send_Byte(SlaveAddress);
HMC5883_Send_Byte(Address);
HMC5883_Send_Byte(Dat);
IIC_Stop();
}
{
uchar Value;
IIC_Start();
HMC5883_Send_Byte(SlaveAddress);
HMC5883_Send_Byte(Addr);
IIC_Start();
HMC5883_Send_Byte(SlaveAddress+1);
Value=HMC5883_Rec_Byte();
IIC_SendAck(1);

18. IIC_Stop();
return Value;
}
void Multiple_Read_HMC5883(void)
{
uchar i; IIC_Start();
HMC5883_Send_Byte(SlaveAddress);
HMC5883_Send_Byte(0x03); IIC_Start();
HMC5883_Send_Byte(SlaveAddress+1);
for(i=0;i<6;i++) {
Rec_Data[i]=HMC5883_Rec_Byte();
if(i==5)
IIC_SendAck(1); else
IIC_SendAck(0); }
IIC_Stop();
Delay(100);

19. }
X=Rec_Data[0]<<8 | Rec_Data[1];//Combine MSB and LSB of X Data output register
Z=Rec_Data[2]<<8 | Rec_Data[3];//Combine MSB and LSB of Z Data output register
Y=Rec_Data[4]<<8 | Rec_Data[5];//Combine MSB and LSB of Y Data output register
Angle= atan2((double)Y,(double)X)*(180/3.14159265)+180;
Angle*=10;
Acr=(uint)Angle;
VI. System performance testing
The post STONE-STVC070WT-01 screen in the e-bike display control Applications in
terminals appeared first on Raspberry PI Projects.