(download it<\/a>)<\/p>\n\r\n#include \/\/SSD\r\n#include \/\/for OLED\r\n#include \r\n#include \r\n#include \/\/HumidityTemp Sensor SHT11\r\n\r\n\/\/OLED PINS\r\n#define OLED_RESET 7 \/\/ RST on OLED\r\n#define OLED_DC 8 \/\/ S\/C on OLED\r\n#define OLED_CS 6 \/\/ CS on OLED - SPI slave-select\r\n#define OLED_MOSI 11 \/\/ DATA on OLED - hardware SPI MOSI\r\n#define OLED_CLK 13 \/\/ CLK on OLED - hardware SPI clock\r\n\r\n\/\/SHT11 Tmp\/Humidity Sensor\r\n\/\/ Specify data and clock connections and instantiate SHT1x object\r\n#define dataPin 9\r\n\/\/#define clockPin 11\r\n#define clockPin 10\r\nSHT1x sht1x(dataPin, clockPin);\r\nfloat temp_c;\r\nfloat temp_f;\r\nfloat humidity;\r\n\r\n\/\/#define SHTPwrPin 4 -not used. When using this, current draw went from 0.6mA when off to 37mA when off!!!! put back\r\n\/\/to 5V pin and back to 0.6mA when off - much better!\r\n#define OLEDPwrPin 3\r\nint redLED = A2;\r\nint grnLED = A3;\r\nint LEDcounter = 0;\r\n\r\nint SHTReadCounter = 0;\r\nint centerToggle = 2;\r\nint upToggle = 12;\r\nint dnToggle = 5;\r\n\/\/switch debouncing\r\nlong debounceDelay = 20; \/\/ the debounce time; increase if the output flickers -\r\nlong lastDebounceTime = 0; \/\/ the last time the output pin was toggled\r\n\/\/for up toggle\r\nint upButtonState; \/\/ the current reading from the input pin\r\nint upLastButtonState = LOW; \/\/ the previous reading from the input pin\r\n\/\/for down toggle\r\nint dnButtonState; \/\/ the current reading from the input pin\r\nint dnLastButtonState = LOW; \/\/ the previous reading from the input pin\r\n\r\n\/\/end switch debouncing\r\n\r\nvolatile int toggle = 1;\r\nchar cVal[32];\r\n\r\nint displayState = 1; \/\/up and down toggles will change the display to different states\r\n\r\nlong shutoffStartMillis = 0; \/\/Store the value to start the shutoff timer from in Milliseconds.\r\n\/\/**********************************\r\n\/\/Change this to determine how long the device stays on - in MS\r\nlong shutOffDelayMS = 180000; \/\/In Milliseconds - Determines how long to keep LED system on (after shutoff timer clicked) in Milliseconds 10000 (10sec), 60000 (1min) 600000 (10min)\r\n\/\/**********************************\r\nboolean debug = false; \/\/turn debugging on or off here\r\n\r\n\/\/OLED\r\nSSD1306 oled(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);\r\n\r\nvoid (*restart)(void) = 0;\r\n\r\n\/***************************************************\r\n* Name: pin2Interrupt\r\n*\r\n***************************************************\/\r\nvoid pin2Interrupt(void)\r\n{\r\n \/* This will bring us back from sleep. *\/\r\n\r\n \/* We detach the interrupt to stop it from\r\n * continuously firing while the interrupt pin\r\n * is low.\r\n *\/\r\n\r\n \/\/appears that the interrup is not working correctly and re-triggering things. Try a restart instead\r\n restart();\r\n\r\n \/\/ - removed while testing restart() function. Put these back if restart removed\r\n \/\/toggle = 1;\r\n \/\/delay(100);\r\n\r\n detachInterrupt(0);\r\n\r\n}\r\n\r\n\/***************************************************\r\n* Description: Enters the arduino into sleep mode.\r\n***************************************************\/\r\nvoid enterSleep(void)\r\n{\r\n\r\n \/* Setup pin2 as an interrupt and attach handler. *\/\r\n \/\/attachInterrupt(interrupt, function, mode)\r\n \/\/attachInterrupt(0, pin2Interrupt, LOW);\r\n attachInterrupt(0, pin2Interrupt, FALLING);\r\n\r\n delay(100);\r\n\r\n \/\/Serial.println(\"Going to sleep....\");\r\n\r\n set_sleep_mode(SLEEP_MODE_PWR_DOWN);\r\n\r\n sleep_enable();\r\n\r\n sleep_mode();\r\n\r\n \/* The program will continue from here. *\/\r\n\r\n \/* First thing to do is disable sleep. *\/\r\n sleep_disable();\r\n}\r\n\r\nvoid setup()\r\n{\r\n Serial.begin(38400);\r\n pinMode(A5, OUTPUT); \/\/testing blink\r\n \/* Setup the pin direction. *\/\r\n pinMode(centerToggle, INPUT);\r\n \/\/pinMode(SHTPwrPin, OUTPUT);\r\n pinMode(OLEDPwrPin, OUTPUT);\r\n pinMode(redLED, OUTPUT);\r\n pinMode(grnLED, OUTPUT);\r\n digitalWrite(grnLED, HIGH); \/\/turn off the green LED - common annode - so they have to be high\r\n digitalWrite(redLED, HIGH); \/\/turn off the gred LED - common annode - so they have to be high\r\n\r\n digitalWrite(upToggle, LOW);\r\n digitalWrite(dnToggle, LOW);\r\n \/\/digitalWrite(SHTPwrPin, LOW);\r\n digitalWrite(OLEDPwrPin, LOW);\r\n\r\n \/\/********* OLED SETUP STUFF ******************************************************************\/\r\n SPI.begin (); \/\/for OLED\r\n \/\/ OLED: By default, we'll generate the high voltage from the 3.3v line internally! (neat!)\r\n oled.ssd1306_init(SSD1306_SWITCHCAPVCC);\r\n \/\/********* OLED SETUP STUFF ******************************************************************\/\r\n \/\/oled.clear();\r\n \/\/oled.display();\r\n\r\n \/\/ displayState = 1;\r\n\r\n if (debug)\r\n {\r\n Serial.println(\"Initialisation complete.\");\r\n Serial.println(\"Entering sleep\");\r\n }\r\n \/\/delay(200);\r\n \/\/enterSleep();\r\n\r\n oled.clear();\r\n\r\n}\r\n\r\nvoid doHumTmp(void)\r\n{\r\n\r\n \/\/ Read values from the sensor\r\n if (SHTReadCounter == 20) \/\/this is based on the delay at the bottom. if delay changes, this value should as well\r\n {\r\n temp_c = sht1x.readTemperatureC();\r\n temp_f = sht1x.readTemperatureF();\r\n humidity = sht1x.readHumidity();\r\n SHTReadCounter = 0;\r\n if (debug)\r\n {\r\n \/\/ Print the values to the serial port\r\n Serial.print(\"Temperature: \");\r\n Serial.print(temp_c, DEC);\r\n Serial.print(\"C \/ \");\r\n Serial.print(temp_f, DEC);\r\n Serial.print(\"F. Humidity: \");\r\n Serial.print(humidity);\r\n Serial.println(\"%\");\r\n }\r\n\r\n }\r\n\r\n oled.clear();\r\n\r\n if (temp_c < 0 || temp_f < 0 || humidity < 0) { \r\n \/\/calibrating \/\/\r\n oled.drawstring([character position from left - by pixel], [line number 0,1,2,3], \"[text]\"); \r\n blinkLED(redLED); \r\n oled.drawline(0, 9, 128, 9, WHITE); \r\n oled.drawstring(0, 2, \"Calibrating...\"); \r\n oled.drawline(0, 30, 128, 30, WHITE);\r\n } else \r\n if(displayState == 1) \/\/good readings show - 2 display states { blinkLED(grnLED); \/\/Temp in C and F \r\n oled.drawstring(0, 0, \"Temp: \"); \r\n ftoa(cVal, temp_c, 1); \r\n oled.drawstring(35, 0, cVal); \r\n \/\/oled.drawchar(65, 0, 9); \r\n \/\/draw degree symbol \r\n \/\/oled.drawcircle([x position px], [y pos line], [diameter units??], WHITE); \r\n oled.drawcircle(61, 1, 1.5, WHITE); \r\n oled.drawstring(64, 0, \"C\"); \r\n \/\/degrees F \r\n ftoa(cVal, temp_f, 1); \r\n oled.drawstring(85, 0, cVal); \r\n \/\/oled.drawchar(115, 0, 9); \r\n oled.drawcircle(110, 1, 1.5, WHITE); \r\n oled.drawstring(114, 0, \"F\"); \r\n \/\/draw split line \r\n oled.drawline(0, 15, 128, 15, WHITE); \r\n \/* int upstate = digitalRead(upToggle); itoa(upstate, cVal, 0); oled.drawstring(0, 2, \"up:\"); oled.drawstring(10, 2, cVal); int dnstate = digitalRead(dnToggle); itoa(dnstate, cVal, 0); oled.drawstring(45, 2, \"dn:\"); oled.drawstring(50, 2, cVal); *\/ \r\n ftoa(cVal, humidity, 1); \r\n oled.drawstring(0, 3, \"Humidity:\"); \r\n oled.drawstring(60, 3, cVal); \r\n oled.drawstring(85, 3, \"%\"); \r\n } \r\n else \r\n if (displayState == 2)\r\n \/\/display state would be 2 here \r\n { \r\n blinkLED(grnLED); \r\n oled.drawstring(0, 0, \"Sensor: Sensiron SHT11 Temp & Humidity\"); \r\n oled.drawstring(0, 2, \"OLED:Adaft SSD1306 128x32\"); \r\n } \r\n else \r\n if (displayState == 3) \r\n { \r\n blinkLED(grnLED); \r\n oled.drawstring(0, 0, \"Board: Modern Device RBBB Kit\"); \r\n oled.drawstring(0, 2, \"Chip: Atmega 328P w\/UNO Bootloader\"); \r\n } \r\n else \r\n if (displayState == 4) \r\n { \r\n blinkLED(grnLED); \r\n oled.drawstring(0, 0, \"Sketch:\"); \r\n oled.drawstring(0, 1, \"HumidityTempSensor1_4\"); \r\n } \r\n \/\/Display all the results \r\n oled.display(); \r\n delay(100); \r\n SHTReadCounter++ ; } \r\n \/*************************************************** * \r\n Name: loop * Description: Main application loop. * Operation Our code will operate as follows: \r\n 1.Set up the serial port and set pin 2 (INT0) as an input; \r\n 2. Run the loop function which will: \r\n 3. Stay awake for 3 seconds; \r\n 4. Once the 3 seconds have elapsed, SLEEP_MODE_PWR_DOWN will be entered; \r\n 5. All code execution stops; \r\n 6. The user then pushes the switch and pin 2 (INT0) will become low; \r\n 7. The INT0 interrupt will fire and bring the Arduino out of sleep mode; \r\n 8. Code execution continues where it had previously stopped. Circuit: http:\/\/donalmorrissey.blogspot.com\/2010\/04\/arduino-external-interrupts.html \r\n ***************************************************\/ \r\n \/\/int seconds=0; \r\nvoid loop() \r\n{ \r\n if (debug) \r\n { \r\n \/\/ Serial.println(\"Still awake....\"); } \r\n \/\/Will put the unit to sleep after a pre-defined amount of time \r\n if (shutoffStartMillis != 0 && millis() - shutoffStartMillis > shutOffDelayMS) \r\n \/\/if shutoff time has elapsed, turn the LEDs off 1000ms = 1 second\r\n {\r\n \/\/delay(100);\r\n\r\n shutoffStartMillis = 0;\r\n \/\/power down the SHT11 Sensor and other ports\r\n digitalWrite(upToggle, LOW);\r\n digitalWrite(dnToggle, LOW);\r\n \/\/digitalWrite(SHTPwrPin, LOW);\r\n\r\n \/\/Power down the OLED\r\n oled.clear();\r\n oled.display();\r\n \/\/digitalWrite(OLED_RESET, LOW);\r\n digitalWrite(OLEDPwrPin, LOW);\r\n\r\n \/\/go to sleep\r\n if (debug) {\r\n Serial.println(\"Entering sleep\");\r\n }\r\n delay(200);\r\n \/\/seconds = 0;\r\n enterSleep();\r\n\r\n }\r\n\r\n \/\/watch the up and down toggle\r\n\r\n \/\/int upToggleReading = digitalRead(upToggle);\r\n \/\/int dnToggleReading = digitalRead(dnToggle);\r\n\r\n \/\/will be able to read each other toggle pin as LOW when it is pressed.\r\n if (debug)\r\n {\r\n \/\/ Serial.print(\"UpToggle: \"); Serial.print(digitalRead(upToggle)); \/\/ Read the pin and display the value\r\n \/\/ Serial.print(\" DnToggle: \"); Serial.println(digitalRead(dnToggle)); \/\/ Read the pin and display the value\r\n \/\/ Serial.print(\" DisplayState: \"); Serial.println(displayState); \/\/ Read the pin and display the value\r\n }\r\n\r\n if (digitalRead(upToggle) == 0)\r\n {\r\n \/\/displayState++;\r\n \/\/if (displayState > 2) {displayState = 1;} \/\/simple method to only go to 2 states\r\n displayState = 1;\r\n delay(100);\r\n }\r\n\r\n if (digitalRead(dnToggle) == 0)\r\n {\r\n\r\n \/\/if (displayState < 1) {displayState = 2;} \/\/simple method to only go to 2 states\r\n\r\n if (displayState < 4)\r\n {\r\n displayState++;\r\n } \/\/dont let it go past a max value\r\n delay(100);\r\n }\r\n\r\n \/*\r\n Serial.print(\"ButtonState: \"); Serial.print(upButtonState);\r\n Serial.print(\" LastButtonState: \"); Serial.print(upLastButtonState);\r\n Serial.print(\" DisplayState: \"); Serial.println(displayState);\r\n\r\n Serial.print(\"ButtonState: \"); Serial.print(dnButtonState);\r\n Serial.print(\" LastButtonState: \"); Serial.print(dnLastButtonState);\r\n Serial.print(\" DisplayState: \"); Serial.println(displayState);\r\n *\/\r\n\r\n \/\/ save the reading. Next time through the loop,\r\n \/\/ it'll be the lastButtonState:\r\n \/\/upLastButtonState = upToggleReading;\r\n \/\/dnLastButtonState = dnToggleReading;\r\n\r\n if (toggle == 1)\r\n {\r\n shutoffStartMillis = millis(); \/\/get a start value to start the countdown from.\r\n displayState = 1; \/\/ensure the display defaults to the main screen\r\n \/\/digitalWrite(SHTPwrPin, HIGH);\r\n digitalWrite(OLEDPwrPin, HIGH);\r\n delay(1000);\r\n \/\/********* OLED SETUP STUFF ******************************************************************\/\r\n \/\/have to do this again with each power on state or the OLED does not come on.\r\n SPI.begin (); \/\/for OLED\r\n \/\/ OLED: By default, we'll generate the high voltage from the 3.3v line internally! (neat!)\r\n oled.ssd1306_init(SSD1306_SWITCHCAPVCC);\r\n \/\/********* OLED SETUP STUFF ******************************************************************\/\r\n delay(500);\r\n \/\/oled.clear();\r\n \/\/oled.display();\r\n\r\n doHumTmp();\r\n\r\n \/\/provide power to the toggle switch up and down.\r\n digitalWrite(upToggle, HIGH);\r\n digitalWrite(dnToggle, HIGH);\r\n\r\n delay(500); \/\/give it some time to calibrate etc\r\n toggle = 0;\r\n\r\n }\r\n else\r\n {\r\n \/\/show the temp and humidity values\r\n doHumTmp();\r\n }\r\n\r\n LEDcounter++;\r\n }\r\n\r\n \/\/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n char *ftoa(char *a, double f, int precision)\r\n {\r\n long p[] = {0, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000};\r\n\r\n char *ret = a;\r\n long heiltal = (long)f;\r\n itoa(heiltal, a, 10);\r\n while (*a != '\\0') a++;\r\n *a++ = '.';\r\n long desimal = abs((long)((f - heiltal) * p[precision]));\r\n itoa(desimal, a, 10);\r\n return ret;\r\n }\r\n\r\n \/\/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n static void print_str(const char *str, int len)\r\n {\r\n int slen = strlen(str);\r\n for (int i = 0; i < len; ++i)\r\n Serial.print(i\r\n }\r\n \/\/~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n static void print_int(unsigned long val, unsigned long invalid, int len)\r\n {\r\n char sz[32];\r\n if (val == invalid)\r\n strcpy(sz, \"*******\");\r\n else\r\n sprintf(sz, \"%ld\", val);\r\n sz[len] = 0;\r\n for (int i = strlen(sz); i < len; ++i) sz[i] = ' '; if (len > 0)\r\n sz[len - 1] = ' ';\r\n Serial.print(sz);\r\n }\r\n\r\n void blinkLED(int led)\r\n {\r\n if (LEDcounter == 10) \/\/we do not want the LED blinking with every cycle as it is seizure enducing!\r\n {\r\n if (led == redLED)\r\n {\r\n digitalWrite(redLED, LOW);\r\n delay(50);\r\n digitalWrite(redLED, HIGH);\r\n }\r\n else\r\n {\r\n digitalWrite(grnLED, LOW);\r\n delay(50);\r\n digitalWrite(grnLED, HIGH);\r\n }\r\n LEDcounter = 0;\r\n }\r\n\r\n }\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"The projects I do tend to fall in one of two buckets – either proof-of-concept (so I can learn new stuff) or items that have some sort of functional use. \u00a0 The need for this project came about when my wife was prodding me about the humidity in the house and whether our humidifier was doing it’s job correctly. \u00a0Most people would just go out and buy a temp \/ humidity sensor and be done … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[65,1],"tags":[64,71],"class_list":["post-2333","post","type-post","status-publish","format-standard","hentry","category-arduino-electronics","category-uncategorized","tag-arduino","tag-oled","has_no_thumb"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pK41j-BD","jetpack_sharing_enabled":true,"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/posts\/2333","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/comments?post=2333"}],"version-history":[{"count":0,"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/posts\/2333\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/media?parent=2333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/categories?post=2333"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.plastibots.com\/index.php\/wp-json\/wp\/v2\/tags?post=2333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\"](\"http:\/\/www.plastibots.com\/wordpress\/wp-content\/uploads\/2012\/04\/HuTmp1b.jpg\" "\\"HuTmp1b\\"")
The need for this project came about when my wife was prodding me about the humidity in the house and whether our humidifier was doing it’s job correctly. \u00a0Most people would just go out and buy a temp \/ humidity sensor and be done with it. \u00a0However, if you have a look around here, you will see that I don’t fit that mold. \u00a0Instead, I decided to build an accurate temp \/ humidity sensor with a Sensiron SHT11 to read the values, a RBBB Arduino kit to process everything and an Adafruit 128×32 OLED to display the results – all wrapped up in… LEGO! \u00a0 Read on for more…<\/p>\n![\"\"](\"http:\/\/www.plastibots.com\/wordpress\/wp-content\/uploads\/2012\/04\/HuTmp1-300x131.jpg\")
<\/a><\/p>\n![\"\"](\"http:\/\/www.plastibots.com\/wordpress\/wp-content\/uploads\/2012\/04\/HuTmp11.jpg\" "\\"HuTmp11\\"")
The key to the accurate humidity \/ temp readings is the Sensiron SHT11 sensor. \u00a0It’s tiny – really tiny. \u00a0 There are 4 connections: 3.3V- 5V, GND, Data, CLK. \u00a0In order to protect the sensor, it has been mounted to the side of the unit inside a clear plastic housing. \u00a0The housing has a hole in the side to allow air to flow freely, but limits the any water that might find its way in there (because you never know when it might rain inside the house \ud83d\ude09<\/p>\n![\"\"](\"http:\/\/www.plastibots.com\/wordpress\/wp-content\/uploads\/2012\/04\/HuTmp3-172x300.jpg\" "\\"HumidityTempSensor2\\"")
<\/a><\/p>\n![\"\"](\"http:\/\/www.plastibots.com\/wordpress\/wp-content\/uploads\/2012\/04\/HuTmp3B1-300x113.jpg\" "\\"HuTmp3B\\"")
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<\/a>\n\t\t\t<\/div><\/figure>\n\t\t<\/div>\n\n