Week 5

  In this week, our group optimized the final program of the D6T. The LED matrix can show the changes in the temperature in the D6T detection area.  We added a buzzer as an alertor in this circuit. We combined the LCD display with the circuit as well. Therefore, all the components are controlled by the Arduino in one program at the same time.
Figure 1. Circuit connection
Figure 2. Schematic

The LED program:
  1.we have reset the conditional statements of the relationship between the color and the temperature.

  2.we have changed the Mathematical relationship between the temperature matrix and the number of the LED lights to make the LED screen can show the corresponding temperature detection area on one side.
  The mathematical expression is：

 
  Where n represents the block number of the D6T temperature matrix and m represents the block number of the LED screen. And m is obtained by mirror symmetry. 
  In the second function, p represents the number of the LED light.
The Buzzer:
  We need a 1k Ohm resistance and a PNP transistor to connect the buzzer into the circuit.
  Connection:
Figure 3. The connection of buzzer

  The base of the PNP is connected to one side of the resistance, and the other side of the resistance is connected to the pin on the Arduino. In this circuit, the Arduino supplies the power.
  Program design:
When the highest temperature of the 16 detection temperatures is higher than the indoor temperature, the buzzer will make a sound.

The LCD:
  We need a 1k Ohm resistance and a 220 Ohm resistance to connect the LCD display into the circuit.
  Connection:
Figure 4. LCD connection

  Program design:
  The first line of the LCD screen shows the indoor temperature. And the second line shows whether there is someone walk in the detection area. If the highest temperature of the 16 detection temperatures is higher than the indoor temperature, the screen will print "break!". If the detection temperature is in other conditions, the screen will print "Safe.".

  There are a lot of cables needed to be used to connect between one component and another component. The breadboard takes too much space in this circuit. And the connection ability of breadboard is not perfect enough. In addition, we need the Arduino board to provide the 5v voltage. Therefore, we use another board and soldered the electircal components on it.
Figure 5. cables
  In the next week, we will try to use a box to pack the circuit to make it have a better appearance. We will make a poster and prepare a presentation for the bench inspection day as well.
  

Comments

Post a Comment

Popular posts from this blog

Week 4

Image
  In this week, our group worked on the ardiuno program, which could control the color and brightness of the LED lights according to the data provided by the D6T. The program is almost worked, but there are still some problems, which are needed to be solved to make this program perfect.   We have designed out two different programs about how to present the properties of the output data on the LED matrix. First program:   The first program presents the changing of the temperature by comparing the temperature in each section with the average temperature of all of the sixteen temperatures. Algorithm design:   This program is designed base on the libaray <FastLED.h> [1]. 1.Divided the 8*8 LED matrixes into 16 parts according to the corresponding detection area of D6T. 2.Put the 16 temperature data into a 4*4matrix. 3.Calacutlate the average value of the 16 temperature data, and compare the average value with that of the last group of data. If the average ...
Read more

WEEK1

Image
In this week, we mainly performed four activities about out project. Firstly, we analysed the circuit we would build in our project.  We had already received the four major components which are Arduino Uno, D6T, MC21609AB6W-BNMLW (2x16 LCD) and buzzer. However, if we wanted to connect three other components to Arduino, we may need another several elements between each component and Arduino.  For D6T, we checked its datasheet and found that its interface is I2C. In order to connect it to Arduino, we need the both house and contact of I2C with proper size for D6T. For 2x16 LCD, there are 8 data bus lines named D0-D7, which indicates that LCD receives the data in parallel way. However, the output data of Arduino Uno is in series. To make two LCD and micro-processor compatible with each other, the series-to-parallel shift register called 74hc595 is required. As for the buzzer, even though the output circuit 40mA is enough for driving buzzer whose rated current is 33mA. The resis...
Read more