Clovis Fritzen / Mbed 2 deprecated temp_humid_time_DS1302_LM35_DHT11

Datalogger that reads temperature, humidity and light level every 10 seconds, and store the data in a microSD card (.CSV file).

Dependencies:   DS1302 SDFileSystem mbed

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@0:8f0934e41a57, 2014-07-04 (annotated)

Committer:
Clovis
Date:
Fri Jul 04 08:08:38 2014 +0000
Revision:
0:8f0934e41a57
Datalogger for temperature, humidity and light level, using a FRDM-K64F development board by Freescale and storing data on a microSD card. It keeps track of the time by means of a DS1302 timekeeping chip.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Clovis 0:8f0934e41a57 1 #include "mbed.h"
Clovis 0:8f0934e41a57 2 #include "SDFileSystem.h"
Clovis 0:8f0934e41a57 3 #include "DHT.h"
Clovis 0:8f0934e41a57 4 #include "DS1302.h"
Clovis 0:8f0934e41a57 5
Clovis 0:8f0934e41a57 6 // Defines for the DS1302 timer module
Clovis 0:8f0934e41a57 7 #define SCLK PTC1
Clovis 0:8f0934e41a57 8 #define IO PTB19
Clovis 0:8f0934e41a57 9 #define CE PTB18
Clovis 0:8f0934e41a57 10
Clovis 0:8f0934e41a57 11 SDFileSystem sd(PTE3, PTE1, PTE2, PTE4, "sd"); //MOSI, MISO, SCLK, SSEL. (SD Card) Tested on K64F, correct pins.
Clovis 0:8f0934e41a57 12 AnalogIn LM35(PTB2);
Clovis 0:8f0934e41a57 13 AnalogIn LDR(PTB3);
Clovis 0:8f0934e41a57 14 int count=0;
Clovis 0:8f0934e41a57 15 float ldrcalc= 0.00;
Clovis 0:8f0934e41a57 16 DigitalOut RedLed(LED1); // Error indication
Clovis 0:8f0934e41a57 17 DigitalOut GreenLed(LED2); // LM35 read indication
Clovis 0:8f0934e41a57 18 DigitalOut Blueled(LED3); // DHT11 read indication
Clovis 0:8f0934e41a57 19 DHT sensor(PTB20,DHT11); // Use the DHT11 sensor, on pin
Clovis 0:8f0934e41a57 20 DS1302 clk(SCLK, IO, PTB18); // ports for the DS1302 time keeper
Clovis 0:8f0934e41a57 21
Clovis 0:8f0934e41a57 22 int main() {
Clovis 0:8f0934e41a57 23 // the 6 lines below are for the time keeper chip
Clovis 0:8f0934e41a57 24 #ifdef INITIAL_RUN
Clovis 0:8f0934e41a57 25 clk.set_time(1403949720);
Clovis 0:8f0934e41a57 26 #endif
Clovis 0:8f0934e41a57 27
Clovis 0:8f0934e41a57 28 char storedByte = clk.recallByte(0);
Clovis 0:8f0934e41a57 29 //printf("\r\nStored byte was %d, now increasing by one\r\n", storedByte);
Clovis 0:8f0934e41a57 30 clk.storeByte(0, storedByte + 1);
Clovis 0:8f0934e41a57 31 //
Clovis 0:8f0934e41a57 32
Clovis 0:8f0934e41a57 33 int err;
Clovis 0:8f0934e41a57 34 wait(1); // wait 1 second for DHT11 to stabilyze
Clovis 0:8f0934e41a57 35
Clovis 0:8f0934e41a57 36 //printf("Hello World!\n");
Clovis 0:8f0934e41a57 37
Clovis 0:8f0934e41a57 38 mkdir("/sd/dados", 0777);
Clovis 0:8f0934e41a57 39
Clovis 0:8f0934e41a57 40 FILE *fp = fopen("/sd/dados/data001.csv", "w");
Clovis 0:8f0934e41a57 41 if(fp == NULL) {
Clovis 0:8f0934e41a57 42 error("Could not open file for write\n");
Clovis 0:8f0934e41a57 43 RedLed= 0;
Clovis 0:8f0934e41a57 44
Clovis 0:8f0934e41a57 45 }
Clovis 0:8f0934e41a57 46 while (1) {
Clovis 0:8f0934e41a57 47
Clovis 0:8f0934e41a57 48 Blueled= 1;
Clovis 0:8f0934e41a57 49 RedLed= 1;
Clovis 0:8f0934e41a57 50 GreenLed= 1;
Clovis 0:8f0934e41a57 51
Clovis 0:8f0934e41a57 52 if (count < 12000000){
Clovis 0:8f0934e41a57 53 count++;
Clovis 0:8f0934e41a57 54 } else{
Clovis 0:8f0934e41a57 55 // --------------------------
Clovis 0:8f0934e41a57 56
Clovis 0:8f0934e41a57 57 err = sensor.readData();
Clovis 0:8f0934e41a57 58 if (err == 0) {
Clovis 0:8f0934e41a57 59 GreenLed= 0;
Clovis 0:8f0934e41a57 60 printf("Temperature is %4.2f \r\n",sensor.ReadTemperature(CELCIUS));
Clovis 0:8f0934e41a57 61 //printf("Temperature is %4.2f F \r\n",sensor.ReadTemperature(FARENHEIT));
Clovis 0:8f0934e41a57 62 //printf("Temperature is %4.2f K \r\n",sensor.ReadTemperature(KELVIN));
Clovis 0:8f0934e41a57 63 printf("Humidity is %4.2f \r\n",sensor.ReadHumidity());
Clovis 0:8f0934e41a57 64 //printf("Dew point is %4.2f \r\n",sensor.CalcdewPoint(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
Clovis 0:8f0934e41a57 65 //printf("Dew point (fast) is %4.2f \r\n",sensor.CalcdewPointFast(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
Clovis 0:8f0934e41a57 66
Clovis 0:8f0934e41a57 67 } else
Clovis 0:8f0934e41a57 68 printf("\r\nErr %i \n",err);
Clovis 0:8f0934e41a57 69
Clovis 0:8f0934e41a57 70 // ----------------------------
Clovis 0:8f0934e41a57 71 FILE *fp = fopen("/sd/dados/data001.csv", "a");
Clovis 0:8f0934e41a57 72 if(fp == NULL) {
Clovis 0:8f0934e41a57 73 error("Could not open file for write\n");
Clovis 0:8f0934e41a57 74
Clovis 0:8f0934e41a57 75 }
Clovis 0:8f0934e41a57 76
Clovis 0:8f0934e41a57 77 ldrcalc= LDR.read();
Clovis 0:8f0934e41a57 78 ldrcalc= (1/ldrcalc)-1;
Clovis 0:8f0934e41a57 79 time_t seconds = clk.time(NULL);
Clovis 0:8f0934e41a57 80 //fprintf(fp, "%s\r,%f,%f,%f\n", "LM35", "DHT11", "Humid", "Month", "Day", "Hour", "Year");
Clovis 0:8f0934e41a57 81 fprintf(fp, "%s\r,%f,%f,%f,%f", ctime(&seconds), 333.333*LM35.read(), sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity(), ldrcalc);
Clovis 0:8f0934e41a57 82 fclose(fp);
Clovis 0:8f0934e41a57 83 //printf("Goodbye World!\n");
Clovis 0:8f0934e41a57 84 count=0;
Clovis 0:8f0934e41a57 85 Blueled= 0;
Clovis 0:8f0934e41a57 86 }
Clovis 0:8f0934e41a57 87 }
Clovis 0:8f0934e41a57 88 }