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@tiagohm tiagohm/TH02.c
Last active May 15, 2020

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Sensor de umidade e temperatura
/*
TH02 - Sensor de umidade e temperatura.
Autor: Tiago Melo
Blog: Microcontrolandos
Compilador: MikroC PRO PIC
Bibliotecas: Soft_I2C, Lcd, Lcd_Constants, Conversions, C_String
*/
// Pinos do TH02.
sbit Soft_I2C_Scl at RB0_bit;
sbit Soft_I2C_Sda at RB1_bit;
sbit Soft_I2C_Scl_Direction at TRISB0_bit;
sbit Soft_I2C_Sda_Direction at TRISB1_bit;
// Pinos do LCD.
sbit LCD_RS at RC0_bit;
sbit LCD_EN at RC1_bit;
sbit LCD_D4 at RC2_bit;
sbit LCD_D5 at RC3_bit;
sbit LCD_D6 at RC4_bit;
sbit LCD_D7 at RC5_bit;
sbit LCD_RS_Direction at TRISC0_bit;
sbit LCD_EN_Direction at TRISC1_bit;
sbit LCD_D4_Direction at TRISC2_bit;
sbit LCD_D5_Direction at TRISC3_bit;
sbit LCD_D6_Direction at TRISC4_bit;
sbit LCD_D7_Direction at TRISC5_bit;
#define RES_14_12 0 // Fast = 0
#define RES_13_11 1 // Fast = 1
#define TH02_ADDRESS(rw) (0x80 | rw)
// Registros.
#define TH02_STATUS_REG 0
#define TH02_DATAH_REG 1
#define TH02_DATAL_REG 2
#define TH02_CONFIG_REG 3
#define TH02_ID_REG 4
typedef union {
char start : 1; // 1 = inicia a conversão.
char heat : 1; // Habilita o heater(aquecedor)
char : 2;
char temp : 1; // 1 = temperatura, 0 = umidade
char fast : 1; // 1 = modo rápido
} TH02_Config_Data;
unsigned TH02_Read(TH02_Config_Data config) {
unsigned valor;
Soft_I2C_Start();
// Inicia a conversão da temperatura.
Soft_I2C_Write(TH02_ADDRESS(0));
Soft_I2C_Write(TH02_CONFIG_REG);
Soft_I2C_Write(*(char*)&config);
Soft_I2C_Stop();
// Aguarda o fim da conversão.
if(config.fast) Delay_ms(20);
else Delay_ms(40);
// Lê os 2 bytes.
Soft_I2C_Start();
Soft_I2C_Write(TH02_ADDRESS(0));
Soft_I2C_Write(TH02_DATAH_REG);
Soft_I2C_Stop();
Soft_I2C_Start();
Soft_I2C_Write(TH02_ADDRESS(1));
((char*)&valor)[1] = Soft_I2C_Read(1);
((char*)&valor)[0] = Soft_I2C_Read(0);
Soft_I2C_Stop();
return valor;
}
// Lê o sensor de temperatura.
float TH02_Read_Temperature(char fast) {
TH02_Config_Data config;
unsigned valor;
// Lê o valor da temperatura.
config.temp = 1;
config.fast = fast;
config.start = 1;
valor = TH02_Read(config) >> 2;
return valor / 32.0 - 50;
}
// Lê o sensor de umidade.
float TH02_Read_Humidity(char fast) {
TH02_Config_Data config;
unsigned valor;
// Lê o valor da umidade.
config.temp = 0;
config.fast = fast;
config.start = 1;
valor = TH02_Read(config) >> 4;
return valor / 16.0 - 24;
}
void main() {
char texto[12];
Soft_I2C_Init();
// Inicializa o LCD.
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR);
Lcd_Cmd(_LCD_CURSOR_OFF);
while(1) {
// Temperatura. Modo normal.
float valor = TH02_Read_Temperature(RES_14_12);
// Converte em texto.
FloatToStr(valor, texto);
// Escreve no LCD.
Lcd_Out(2, 1, texto);
// Umidade. Modo rápido.
valor = TH02_Read_Humidity(RES_13_11);
// Converte em texto.
FloatToStr(valor, texto);
// Escreve no LCD.
Lcd_Out(1, 1, texto);
// Faz nada durante 1s.
Delay_ms(1000);
}
}
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