Datalogger that reads temperature, humidity and light level every couple of seconds, and store the data in a microSD card (.CSV file).
Dependencies: DS1302 SDFileSystem mbed
Fork of temp_humid_time_DS1302_LM35_DHT11 by
This is a weather station/datalogger using a Freescale FRDM-K64F dev board, a LM35 (temperature sensor), a DHT11 (temperature and humidity sensor), a DS1302 (timekeeper module) and a LDR (light level sensor). All the data is periodically stored on a microSDHC card; The acquisition period is adjustable via software (by setting the value of a counter).
There is also (commented) code for sending all these information via serial to a terminal on PC.
Full explanation, details and schematics can be found here: http://embedded-clovis.blogspot.ca/2014/07/temperature-datalogger-with-arm-cortex.html
main.cpp
- Committer:
- Clovis
- Date:
- 2014-07-24
- Revision:
- 1:4b3e952a1406
- Parent:
- 0:8f0934e41a57
File content as of revision 1:4b3e952a1406:
#include "mbed.h" #include "SDFileSystem.h" #include "DHT.h" #include "DS1302.h" // Defines for the DS1302 timer module #define SCLK PTC1 #define IO PTB19 #define CE PTB18 SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); //MOSI, MISO, SCLK, SSEL. (SD Card) Tested on K64F, correct pins. AnalogIn LM35(PTB2); AnalogIn LDR(PTB3); AnalogIn SolarPanel(PTB10); int count=0; float ldrcalc= 0.00; DigitalOut RedLed(LED1); // Error indication DigitalOut GreenLed(LED2); // LM35 read indication DigitalOut Blueled(LED3); // DHT11 read indication DHT sensor(PTB20,DHT11); // Use the DHT11 sensor, on pin DS1302 clk(SCLK, IO, PTB18); // ports for the DS1302 time keeper int main() { // the 6 lines below are for the time keeper chip #ifdef INITIAL_RUN clk.set_time(1406017928); #endif char storedByte = clk.recallByte(0); //printf("\r\nStored byte was %d, now increasing by one\r\n", storedByte); clk.storeByte(0, storedByte + 1); // int err; wait(1); // wait 1 second for DHT11 to stabilyze //printf("Hello World!\n"); mkdir("/sd/dados", 0777); FILE *fp = fopen("/sd/dados/data004.csv", "a"); if(fp == NULL) { error("Could not open file for write\n"); RedLed= 0; } fprintf(fp, "%s\r,", "--------------"); fclose(fp); while (1) { Blueled= 1; RedLed= 1; GreenLed= 1; if (count < 5000000){ //around 10 seconds before it reaches the count of 12000000 count++; } else{ // -------------------------- err = sensor.readData(); if (err == 0) { GreenLed= 0; printf("Temperature is %4.2f \r\n",sensor.ReadTemperature(CELCIUS)); //printf("Temperature is %4.2f F \r\n",sensor.ReadTemperature(FARENHEIT)); //printf("Temperature is %4.2f K \r\n",sensor.ReadTemperature(KELVIN)); printf("Humidity is %4.2f \r\n",sensor.ReadHumidity()); //printf("Dew point is %4.2f \r\n",sensor.CalcdewPoint(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity())); //printf("Dew point (fast) is %4.2f \r\n",sensor.CalcdewPointFast(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity())); } else printf("\r\nErr %i \n",err); // ---------------------------- FILE *fp = fopen("/sd/dados/data004.csv", "a"); if(fp == NULL) { error("Could not open file for write\n"); } ldrcalc= LDR.read(); ldrcalc= (1/ldrcalc)-1; //Transforms the LDR value into a 0-5 signal (integer) time_t seconds = clk.time(NULL); //fprintf(fp, "%s\r,%f,%f,%f\n", "LM35", "DHT11", "Humid", "Month", "Day", "Hour", "Year"); fprintf(fp, "%s\r,%f,%f,%f,%f,%f", ctime(&seconds), 333.333*LM35.read(), SolarPanel.read(), sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity(), ldrcalc); fclose(fp); //printf("Goodbye World!\n"); count=0; Blueled= 0; } } }