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https://github.com/1991Patrick/I2C_SHT2x.git
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191 lines
7.2 KiB
C
191 lines
7.2 KiB
C
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/*!
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* \file main.c
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* \author Patrick Taling
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* \date 31/03/2017
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* \version 1.0
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*
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* \brief
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* Simple I2C SHT2x library to measure relative humidity and temperature and write it to an I2C LCD with the ATxmega256a3u.
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* Rights are owned by the original authors (Atmel, w.e.dolman, Noel200 (Elektroda) and Sensirion)
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*
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* \Hardware
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* # 1602 I2c HD44780 LCD from HobbyElectronica https://www.hobbyelectronica.nl/product/1602-lcd-i2c-blauw-backlight/
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* # HvA Xmega-bord (ATxmega256a3u with programmer/ USB-RS232-interface ATxmega32a4u)
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* # 3.3V - 5V levelshifter with two BS170 N-channel MOSFET
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* # Humidity/ temperature sensor module (EBM016) https://www.elektor.nl/humidity-sensor-module-ebm016
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*
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* \development
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* # Atmel Studio 7 (version: 7.0.118)
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* # OS Version: Microsoft Windows NT 6.2.9200.0 (Platform: Win32NT)
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* # Atmel Gallary (7.8)
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*
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* \details
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* #The file main.c is the main to write text to a I2C lcd (PCF8574T adress 0x27) with the ATxmega256a3u.
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* #For the use of the main code you need the i2c library from w.e.dolman (<a href="mailto:w.e.dolman@hva.nl">w.e.dolman@hva.nl</a>)
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* #For i2c.c use code 21.8 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
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* #For i2c.h use code 21.9 from "de taal C en de Xmega tweede druk" http://dolman-wim.nl/xmega/book/index.php
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*
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* #The main code needs some parts of the i2c_lcd library from Noel200 from http://www.elektroda.pl/rtvforum/topic2756081.html.
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* #The library can be downloaded from: http://www.elektroda.pl/rtvforum/login.php?redirect=download.php&id=670533.
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* #Go to LCD_PCF8574T/lcd_pcf/ and use i2c_lcd.c and i2c_lcd.h from the pakkage
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*
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* #The libraby needs some parts of the the SHT2x library from SENIRION from https://www.sensirion.com/en/products/humidity-sensors/humidity-temperature-sensor-sht2x-digital-i2c-accurate/
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* #The libraby can be download from: https://www.sensirion.com/en/products/all-documents-of-sensirions-humidity-sensors-for-download/
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* # Go to SHT2x/ Sample Code SHT21 and download the zip file Sensirion_Humidity_Sensors_SHT21_Sample_Code_C-file
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* \note the following files aren't fully used. Most parts are used in other .c of .h files or disabled.
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* DisplayDip204.C, DisplayDip204.h,
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* I2C_HAL.c, I2C_HAL.h,
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* System.c, System.h and
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* io70f3740.h.
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* \note for the use of two SHT2X you should use different IOs for SDA or additional hardware such as I2C multiplexer.
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* The adress of the SHT2x can’t be changed.
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*
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* \verbatim
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* #include <i2c_lcd.h>
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* #include <I2C_SHT2x.h>
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* #include <Typedefs.h>
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\endverbatim
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* \par
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*
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* \note An AVR-project can use multiple I2C's. One shoud take care that
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* in different source files there are no multiple i2c_init
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* definitions for the same I2C.
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*/
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#define F_CPU 2000000UL
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <stdio.h>
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#include <stdlib.h>
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#define BAUD_100K 100000UL
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#include "I2C_SHT2x.h"
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#include "Typedefs.h"
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#include "i2c_lcd.h"
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//==============================================================================
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int main()
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//==============================================================================
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{ // variables
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uint8_t error = 0;
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uint8_t userRegister;
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int endOfBattery;
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nt16 sRH;
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float humidityRH = 0;
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nt16 sT;
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float temperatureC = 0;
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uint8_t SerialNumber_SHT2x[8];
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char buffer[20];
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uint16_t h;
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i2c_init(&TWIE, TWI_BAUD(F_CPU, BAUD_100K));
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PORTE.DIRSET = PIN1_bm|PIN0_bm; //SDA 0 SCL 1
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i2c_lcd_init();
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i2c_lcd_led_on();
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i2c_lcd_set_cursor(0,0);
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_delay_ms(15); //initialization powerUp SHT2x (15ms)
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i2c_lcd_clear();
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_delay_us(1500); //initialization powerUp LCD (1.5ms)
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i2c_lcd_set_cursor(0,0);
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i2c_lcd_write_text("T :");
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i2c_lcd_write_text("--.-- C");
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i2c_lcd_set_cursor(0,1);
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i2c_lcd_write_text("RH:");
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i2c_lcd_write_text("--.-- %");
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while(1)
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{
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error = 0; // reset error status
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//=====================================================
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// --- Reset sensor by command ---
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//=====================================================
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error |= i2c_SHT2x_SoftReset();
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//=====================================================
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// --- Read the sensors serial number (64bit) ---
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//=====================================================
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error |= i2c_SHT2x_GetSerialNumber(SerialNumber_SHT2x);
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//=====================================================
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// --- Set Resolution e.g. RH 10bit, Temp 13bit ---
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//=====================================================
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error |= i2c_SHT2x_ReadUserRegister(&userRegister);
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userRegister = (userRegister & ~SHT2x_RES_MASK) | SHT2x_RES_10_13BIT;
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error |= i2c_SHT2x_WriteUserRegister(&userRegister);
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//=====================================================
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// --- measure humidity with "Hold Master Mode (HM)" ---
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//=====================================================
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error |= i2c_SHT2x_MeasureHM(TEMP, &sT);
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error |= i2c_SHT2x_MeasureHM(HUMIDITY, &sRH);
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//=====================================================
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// --- measure temperature with "Polling Mode" (no hold master) ---
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// --- Disabled due to error in TEMP ----
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//=====================================================
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//error |= i2c_SHT2x_MeasurePoll(HUMIDITY, &sRH); //works fine
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//error |= i2c_SHT2x_MeasurePoll(TEMP, &sT); // Has an error in reading measuring
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//=====================================================
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//-- calculate humidity and temperature --
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//=====================================================
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temperatureC = i2c_SHT2x_CalcTemperatureC(sT.u16);
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humidityRH = i2c_SHT2x_CalcRH(sRH.u16);
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//=====================================================
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// --- check end of battery status (eob)---
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//=====================================================
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error |= i2c_SHT2x_ReadUserRegister(&userRegister); //get actual user reg
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if( (userRegister & SHT2x_EOB_MASK) == SHT2x_EOB_ON ) endOfBattery = TRUE;
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else endOfBattery = FALSE;
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//=====================================================
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//-- write humidity, temperature or error values on LCD --
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//=====================================================
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if(error != 0){
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i2c_lcd_clear();
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_delay_us(1500);
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i2c_lcd_write_text("An ERROR");
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i2c_lcd_set_cursor(0,1);
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i2c_lcd_write_text("has occurred");
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}
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else if (endOfBattery){
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i2c_lcd_clear();
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_delay_us(1500);
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i2c_lcd_write_text("LOW BATTERY");
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}
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else{
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i2c_lcd_clear();
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_delay_us(1500);
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i2c_lcd_set_cursor(0,0);
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h= temperatureC;
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i2c_lcd_write_text("T :");
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utoa(temperatureC, buffer, 10);
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i2c_lcd_write_text(buffer);
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i2c_lcd_write_text(".");
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utoa((temperatureC-h)*100, buffer, 10);
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i2c_lcd_write_text(buffer);
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i2c_lcd_write_text(" C");
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i2c_lcd_set_cursor(0,1);
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h= humidityRH;
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i2c_lcd_write_text("RH:");
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utoa(humidityRH, buffer, 10);
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i2c_lcd_write_text(buffer);
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i2c_lcd_write_text(".");
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utoa((humidityRH-h)*100, buffer, 10);
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i2c_lcd_write_text(buffer);
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i2c_lcd_write_text(" %");
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}
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_delay_ms(300); // wait 3s for next measurement
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}
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}
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