Our project, the Benedictus Gauge, measures the temperature and humidity of the surrounding environment upon sound activation. The temperature (in Celcius) and humidity (in percentage) is then displayed on a 4-digit display. The temperature is displayed on the left and the humidity is displayed on the right. The gauge also features a LED that changes color according to the temperature. For example, if the temperature falls below 20 degrees Celcius, the light turns blue. If the temperature is above 20 degrees Celcius, the light turns red.
We, the Dongers, decided to make this project because we wanted an easy way to read the temperature with minimal effort. Sometimes, people are too lazy to check the weather on their phone or computer, so we made it easy for people to know what temperature it is outside. We also implemented the light feature so that if you are too lazy to read numbers, you can easily tell the temperature by looking at the color of the light.
The Benedictus Gauge in action
One caveat is that we cannot measure the temperature outside when it is raining. Another is that if we want to read the outside temperature, we must wire the temperature sensor from an outside source to the indoors. However, in future projects, we will plan on improving and eliminating these inconveniences.
The code allows the launchpad and grove kit to display the temperature upon sound activation
#include"TM1637.h" #include"DHT.h"#define SOUND_SENSOR 25 /* sound sensor pin */#define LED RED_LED /* LED pin */#define THRESHOLD_VALUE 2000 /* sound threshold value*/#define LED RED_LED /* LED */#define CLK 39 /* 4-digital display clock pin */#define DIO 38 /* 4-digital display data pin */#define TEMP_HUMI_PIN 24 /* pin of temperature&humidity sensor */TM1637tm1637(CLK,DIO);/* 4-digital display object */DHTdht(TEMP_HUMI_PIN,DHT22);/* temperature&humidity sensor object */intbrightness=255;/* initialize brightness of the display */int8_tt_bits[2]={0};/* array to store the single bits of the temperature */int8_th_bits[2]={0};/* array to store the single bits of the humidity */intsound_value=0;/* initialize sound value */voidsetup(){tm1637.init();/* initialize 4-digital display */tm1637.set(BRIGHT_TYPICAL);/* set the brightness */tm1637.point(POINT_ON);/* light the clock point ":" */dht.begin();/* initialize temperature humidity sensor */pinMode(LED,OUTPUT);/* declare the LED pins as OUTPUT */pinMode(BLUE_LED,OUTPUT);pinMode(GREEN_LED,OUTPUT);}voidloop(){// put your main code here, to run repeatedly:sound_value=analogRead(SOUND_SENSOR);if(sound_value>THRESHOLD_VALUE)/* if the sound value is greater than threshold, activate the display */{inta;for(a=0;a<10;a=a+1){digitalWrite(GREEN_LED,LOW);int_temperature=dht.readTemperature();/* read the temperature value from the sensor */int_humidity=dht.readHumidity();/* read the humidity value from the sensor */memset(t_bits,0,2);/* reset array when we use it */memset(h_bits,0,2);/* 4-digital-display [0,1] is used to display temperature */t_bits[0]=_temperature%10;_temperature/=10;t_bits[1]=_temperature%10;if(t_bits[1]>=2){digitalWrite(RED_LED,brightness);digitalWrite(BLUE_LED,LOW);}else{digitalWrite(BLUE_LED,brightness);digitalWrite(RED_LED,LOW);}/* 4-digital-display [2,3] is used to display humidity */h_bits[0]=_humidity%10;_humidity/=10;h_bits[1]=_humidity%10;/* show it */tm1637.display(1,t_bits[0]);tm1637.display(0,t_bits[1]);tm1637.display(3,h_bits[0]);tm1637.display(2,h_bits[1]);}}elseif(sound_value<THRESHOLD_VALUE){/* display all zeros when the display is not in use */tm1637.display(1,0);tm1637.display(0,0);tm1637.display(3,0);tm1637.display(2,0);}}
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