Chcę zmierzyć temperaturę i wilgotność powietrza za pomocą czujnika DHT22. Wyniki mają być wyświetlane na wyświetlaczu LCD. Biblioteki LCD i 1wire zostały zaczerpnięte z płyty dołączonej do niebieskiej książki. Czy mógłby mi ktoś pomóc i powiedzieć jak zmienić poniższy kod by wyniki były wyświetlane na wyświetlaczu LCD a nie poprze uart?
[syntax=c]int main(void)
{
char printbuff[100];
//init uart
uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
//init interrupt
sei();
#if DHT_FLOAT == 1
float temperature = 0;
float humidity = 0;
#endif
for (;;) {
if(dht_gettemperaturehumidity(&temperature, &humidity) != -1) {
#if DHT_FLOAT == 1
dtostrf(temperature, 3, 3, printbuff);
#endif
uart_puts("temperature: "); uart_puts(printbuff); uart_puts("C");uart_puts("\r\n");
#if DHT_FLOAT == 1
dtostrf(humidity, 3, 3, printbuff);
#endif
uart_puts("humidity: "); uart_puts(printbuff); uart_puts("%RH");uart_puts("\r\n");
} else {
uart_puts("error"); uart_puts("\r\n");
}
uart_puts("\r\n");
_delay_ms(1500);
}
return 0;
}[/syntax]
poniżej załączam również dht22.h i dht.c
[syntax=c]* dht22.h
#ifndef DHT22_H_
#define DHT22_H_
#include <stdlib.h>
#include <inttypes.h>
#include "onewire.h"
#define DHT_DDR DDRD
#define DHT_PORT PORTD
#define DHT_PIN PIND
#define DHT_INPUTPIN PD7
#define DHT_TYPE DHT_DHT22
#if DHT_TYPE == DHT_DHT22
#define DHT_FLOAT 1
#endif
#define DHT_TIMEOUT 200
#if DHT_FLOAT == 1
extern int8_t dht_gettemperature(float *temperature);
extern int8_t dht_gethumidity(float *humidity);
extern int8_t dht_gettemperaturehumidity(float *temperature, float *humidity);
#endif
#endif /* DHT22_H_ */[/syntax]
[syntax=c]*
* dht22.c
#include <avr/io.h>
#include <util/delay.h>
#include "dht22.h"
#include "onewire.h"
#include "crc8.h"
#if DHT_FLOAT == 1
int8_t dht_getdata(float *temperature, float *humidity) {
#endif
uint8_t bits[5];
uint8_t i,j = 0;
memset(bits, 0, sizeof(bits));
//reset port
DHT_DDR |= (1<<DHT_INPUTPIN); //output
DHT_PORT |= (1<<DHT_INPUTPIN); //high
_delay_ms(100);
//send request
#if DHT_TYPE == DHT_DHT22
_delay_us(500);
#endif
DHT_PORT |= (1<<DHT_INPUTPIN); //high
DHT_DDR &= ~(1<<DHT_INPUTPIN); //input
_delay_us(40);
//check start condition 1
if((DHT_PIN & (1<<DHT_INPUTPIN))) {
return -1;
}
_delay_us(80);
//check start condition 2
if(!(DHT_PIN & (1<<DHT_INPUTPIN))) {
return -1;
}
_delay_us(80);
//read the data
uint16_t timeoutcounter = 0;
for (j=0; j<5; j++) { //read 5 byte
uint8_t result=0;
for(i=0; i<8; i++) {//read every bit
timeoutcounter = 0;
while(!(DHT_PIN & (1<<DHT_INPUTPIN))) { //wait for an high input (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT_TIMEOUT) {
return -1; //timeout
}
}
_delay_us(30);
if(DHT_PIN & (1<<DHT_INPUTPIN)) //if input is high after 30 us, get result
result |= (1<<(7-i));
timeoutcounter = 0;
while(DHT_PIN & (1<<DHT_INPUTPIN)) { //wait until input get low (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT_TIMEOUT) {
return -1; //timeout
}
}
}
bits[j] = result;
}
//reset port
DHT_DDR |= (1<<DHT_INPUTPIN); //output
DHT_PORT |= (1<<DHT_INPUTPIN); //low
_delay_ms(100);
//check checksum
if ((uint8_t)(bits[0] + bits[1] + bits[2] + bits[3]) == bits[4]) {
//return temperature and humidity
#if DHT_TYPE == DHT_DHT22
uint16_t rawhumidity = bits[0]<<8 | bits[1];
uint16_t rawtemperature = bits[2]<<8 | bits[3];
if(rawtemperature & 0x8000) {
*temperature = (float)((rawtemperature & 0x7FFF) / 10.0) * -1.0;
} else {
*temperature = (float)(rawtemperature)/10.0;
}
*humidity = (float)(rawhumidity)/10.0;
#endif
return 0;
}
return -1;
}
/*
* get temperature
*/
#if DHT_FLOAT == 1
int8_t dht_gettemperature(float *temperature) {
float humidity = 0;
#endif
return dht_getdata(temperature, &humidity);
}
/*
* get humidity
*/
#if DHT_FLOAT == 1
int8_t dht_gethumidity(float *humidity) {
float temperature = 0;
#endif
return dht_getdata(&temperature, humidity);
}
/*
* get temperature and humidity
*/
#if DHT_FLOAT == 1
int8_t dht_gettemperaturehumidity(float *temperature, float *humidity) {
#endif
return dht_getdata(temperature, humidity);
}[/syntax]Statystyki: Napisane przez Maverick — 9 cze 2014, o 15:26
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