Week 17

Week 16

Week 15

Meet the supervisor for further discussion and discuss more detail about this project .Firstly need to design circuit that involve in this project such as max232 and demux 74138N circuit.  
The correct component is essential to ensure the system working.

MAX232 CIRCUIT

DEMUX 74318

Week 14

SUBMIT THE PROPOSAL REPORT

The blog and proposal must be submit  After 14 weeks research and study the operation and components about the GSM based on advertisement display board project.The proposal is written to propose our ideas to the supervisor and FYP committee and to ensure all activity have been recorded, so can refer if a problem will be appears.The purpose of the blog is to records activities that have been done from week 1 until week 14.From blog and proposal can document the work that have been planned and work that have done.

WORK PLAN

Work plan is commonly used in project management, is one of the most popular and useful ways of showing activities (tasks or events) displayed against time. On the left of the chart is a list of the activities and along the top is a suitable time scale. Each activity is represented from semester 1 and semester 2 by a bar, the position and length of the bar reflects the start date, duration and end date of the activity.

 SEMESTER 1

SEMESTER 2

Week 13

DISPLAY  DOT MATRIX BOARD

Generally the LED Scrolled Message can be implemented with many different logics. Out of two are very famous is:

• LED moving message display board design using decade counters
• LED moving message display board design using shift registers

So I am implementing LED moving display using shift registers.LED Scrolling Display can be implemented by using any microcontroller like 8051, PIC and AVR controllers.

Before going for LED Dot Matrix, generally the LEDs are two types:

• High power LEDs
• Miniature LEDs

High power LEDs are very costly, so in this project we will use miniature type of LEDs. Basically the standard RED color LED requires 2-3V to ON. But to glow the LEDs brightly enough, it require 20mA current to flow.

To construct an array using 8 LEDs firstly the entire cathodes are connected together and should be grounded. Each LED anode is driven by manual switches or by microcontroller. The microcontroller is programmed to generate different patterns on these LEDs. The individual LED current is summed up and a large current flow into the ground terminal. If each LED takes 20mA current, therefore eight LEDs current = 8*20mA. A total of 160mA current sinks into the ground terminal.

By using single array of LEDs we can generate different type of patterns. If we arrange the LED arrays side by side with multiplexing technique, it is also possible to generate letters, symbols, numbers, pictures, animations also. The LED Dot Matrix can be constructed by connecting all the anode terminals of LED’s together in each row and all the cathode terminals are joined together in each column.

An 8x8 LED matrix construction is shown in figure below:

Common-row anode                                    common-row cathode

Week 12

                         MICROCONTROLLER 16F1938

The PIC16F1938 has an internal Low Dropout Regulator (LDO) which provides operation above 3.6V.The LDO regulates a voltage for the internal device logic while permitting the VDD and I/O pins to operate at a higher voltage. There is no user enable/disable control available for the LDO, it is always active. The PIC16LF1938 operates at a maximum VDD of 3.6V and does not incorporate an LDO. A device I/O pin may be configured as the LDO voltage output, identified as the VCAP pin. Although not required, an external low-ESR capacitor may be connected to the VCAP pin for additional regulator stability

PIN LAYOUT

 High-Performance RISC CPU:

• Only 49 Instructions to Learn:
- All single-cycle instructions except branches
• Operating Speed:
- DC – 32 MHz oscillator/clock input
- DC – 125 ns instruction cycle
• Up to 16K x 14 Words of Flash Program Memory
• Up to 1024 Bytes of Data Memory (RAM)
• Interrupt Capability with automatic context saving
• 16-Level Deep Hardware Stack
• Direct, Indirect and Relative Addressing modes
• Processor Read Access to Program Memory
• Pinout Compatible to other 28/40-pin PIC16CXXX
and PIC16FXXX Microcontrollers

Special Microcontroller Features:

• Precision Internal Oscillator:
- Factory calibrated to ±1%, typical
- Software selectable frequency range from
  32 MHz to 31 kHz
• Power-Saving Sleep mode
• Power-on Reset (POR)
• Power-up Timer (PWRT) and Oscillator Start-up
   Timer (OST)
• Brown-out Reset (BOR):
- Selectable between two trip points
- Disable in Sleep option
• Multiplexed Master Clear with Pull-up/Input Pin
• Programmable Code Protection
• Wide Operating Voltage Range:
- 1.8V-5.5V (PIC16F193X)
- 1.8V-3.6V (PIC16LF193X)

PIC16LF193X Low-Power Features:

• Standby Current:
- 60 nA @ 1.8V, typical
• Operating Current:
- 43A/MHz @ 1.8V, typical
• Timer1 Oscillator Current:
- 600 nA @ 32 kHz, 1.8V, typical
• Low-Power Watchdog Timer Current:
- 500 nA @ 1.8V, typical

Peripheral Features:

• Up to 35 I/O Pins and 1 Input-only pin:
- High-current source/sink for direct LED drive
- Individually programmable Interrupt-on-pin
change pins
- Individually programmable weak pull-ups
• Integrated LCD Controller:
- Up to 96 segments
- Variable clock input
- Contrast control
- Internal voltage reference selections
• Capacitive Sensing module (mTouchTM):
- Up to 16 selectable channels
• A/D Converter:
- 10-bit resolution and up to 14 channels
- Selectable 1.024/2.048/4.096V voltage
reference
• Timer0: 8-Bit Timer/Counter with 8-Bit
   Programmable Prescaler
• Enhanced Timer1:
- Dedicated low-power 32 kHz oscillator driver
- 16-bit timer/counter with prescaler
- External Gate Input mode with toggle and
single-shot modes
- Interrupt-on-gate completion
• Timer2, 4, 6: 8-Bit Timer/Counter with 8-Bit Period
Register, Prescaler and Postscaler
• Two Capture, Compare, PWM Modules (CCP):
- 16-bit Capture, max. resolution 125 ns
- 16-bit Compare, max. resolution 125 ns
- 10-bit PWM, max. frequency 31.25 kHz
• Three Enhanced Capture, Compare, PWM
  modules (ECCP):
- 3 PWM time-base options
- Auto-shutdown and auto-restart
- PWM steering
- Programmable Dead-band Delay

Week 11

GLOBAL SYSTEM FOR MOBILE COMMUNICATION

 (GSM)

    GSM modem is specialized type of modem that operates over subscription based wireless networks which is similar to a mobile phone. A GSM modem accepts a SIM card, and basically acts like a mobile phone for the computer. Traditional modem is attached to computers for ‘dial-up’ to connect with other computer systems. A GSM modem operates in a similar fashion, except that it sends and receives data through radio waves rather than a telephone line.

Besides the dial-up connection, GSM modem can also be used for sending and receiving SMS which is also one of the key features of GSM modem. Some of the features of this GSM Modem are as follow:

· RS-232 Interface

· Tri-Band: GSM900, GSM1800 and GSM1900

· Support TCP/IP

· Support standard extended open AT commands

· Support GPRS class 10

· Accept supply voltage from 5 to 12V

· Support PDU and Text mode for SMS

Example GSM Rs-232 modem