Instructables

Mini Arduino environment monitor ** UPDATE - Added RTC ***

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This is an Example of how you can use the Arduino to monitor various environmental parameters And display them on a LCD screen. 

Note: I Added a Real Time Clock!! To see the steps, added parts  and Sketch I added new steps..
 
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Step 1: Parts List

Arduino uno R3 or compatible                                           30.00 
Sainsmart "1.8" TFT Color LCD Display                          18.50 
DHT11 Digital Temperature and Humidity Sensor        6.44 
Mini Breadboard                                                                    5.00 
Jumper Wire

Step 2: Connect display to Arduino

Picture of Connect display to Arduino
I used the mini breadboard to connect the display to the Arduino.
Use jumper wires to connect from the Arduino pins to the breadboard in the following order:
Arduino:  5v         TFT DISPLAY   VCC
                 gnd                                 GND            
Digital     4                                      SCL                  
                 5                                     SDA
                 6                                     CS
                 7                                     DC
                 8                                     RES

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1164689 days ago

thank you so much finally was able to get my lcd screen to work!

HI everyone

I have a next problem when I try to compyle

C:\Program Files (x86)\Arduino\libraries\Adafruit_ST7735\Adafruit_ST7735.cpp: In member function 'void Adafruit_ST7735::commonInit(const uint8_t*)':
C:\Program Files (x86)\Arduino\libraries\Adafruit_ST7735\Adafruit_ST7735.cpp:324: error: 'SPI' was not declared in this scope
C:\Program Files (x86)\Arduino\libraries\Adafruit_ST7735\Adafruit_ST7735.cpp:326: error: 'SPI_CLOCK_DIV4' was not declared in this scope
C:\Program Files (x86)\Arduino\libraries\Adafruit_ST7735\Adafruit_ST7735.cpp:334: error: 'SPI_MODE0' was not declared in this scope

thpradhan1 month ago

i am a software developer after reviewing these project i am big fan of Arduino and your's .. thanks a lot for nice share..

in couple of days i am getting my board and other things as soon i do my first test m going to upload :)

thanks once again for lovely share.

pkinahan1 month ago

Would it be possible to add a particle counter to this instructable?

johnag (author)  pkinahan1 month ago

yes, if you find one with an arduino compatible output... but I haven't seen. Any out there...

boozer_23 months ago

I dont really need the display, but I need to access the sensor values over the network so I can remotely monitor temp/humidity etc. Anyone know how to add networking to this so the temps can be read remotely?

johnag (author)  boozer_23 months ago

check this instructable out, it might be what you're. Looking for:

http://www.instructables.com/id/Arduino-TempHumidity-with-LCD-and-Web-Interface/

sam_773 months ago

Dear Jhon

That's a gr8 project you have built but after watching your vedio i wish to ask you why does the display on the lcd screen keeps on changing is there any way to keep it stable?

regards

sachin

johnag (author)  sam_773 months ago

yes the last update to the sketch only refreshes the numbers instead of clearing the entire screen

sam_77 johnag3 months ago

thnx dear John would I am looking forward to make after a few things done

sam_77 johnag3 months ago

thnx dear John would I am looking forward to make after a few things done

Edgar1 year ago
This can help security personnel monitor a lot of additional useful stuff, at a glance, you could make a commercial version of this. Voted and went to my Blog:
http://faz-voce-mesmo.blogspot.pt/2013/06/robots-brava.html
johnag (author)  Edgar1 year ago
Obrigado Edgar
anikin1976 johnag6 months ago

Hello.

The project remarkable, tell as to replace DHT11 sensor with the DS18S20 sensor, what it is necessary to change?

Edgar johnag1 year ago
Sempre às ordens.
Edgar johnag1 year ago
:)
anikin19766 months ago

Hello.

The project remarkable, tell as to replace DHT11 sensor with the DS18S20 sensor what it is necessary to change?

MoonDocker7 months ago

I don't know if anyone else noticed but you need to change the graphicstest code example from adafruit to work with this display. Make sure you have the below at the beginning of the code. The code comes preset with the code for the shield. I spent a few minutes trying to get my display to work and finally looked closely at the code.

// For the breakout, you can use any (4 or) 5 pins

#define sclk 4

#define mosi 5

#define cs 6

#define dc 7

#define rst 8 // you can also connect this to the Arduino reset

barracuda438 months ago
Hello,
I want to use a larger display 3.2 for this project, what would I use here?

Thanks nice project
barracuda4311 months ago
Hello Well, maybe a stupid question but
How can I set the date and time I have some tried but no result.

Thanks Bill
johnag (author)  barracuda4311 months ago
Use the sample sketch that came with the rtc library there is an option to set the rtc to your compute time

johnag (author)  johnag9 months ago
Code to set the clock:

if (! RTC.isrunning()) {

// following line sets the RTC to the date & time the sketch is compiled
RTC.adjust(DateTime(__DATE__, __TIME__));
}
johnag (author)  johnag9 months ago
Here's an sketch to run just the RTC, copy and paste to the Arduino IDE. it sets the clock if it's not set.
// Sketch Build 1.04 compiled on Arduino 1.0.3.
// This sketch was modified to run the loop faster.. refresh rate is about 1.5 seconds.
// copy the sketch below and paste it into the Arduino IDE verify, and run the program.
// this sketch was created using code from the adafruit and RTC -libraries
#define sclk 4
#define mosi 5
#define cs 6
#define dc 7
#define rst 8

#include // Core graphics library
#include // Hardware-specific library
#include
#include // library needed for RTC
#include "RTClib.h" //RTC Library

RTC_DS1307 RTC;

Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, mosi, sclk, rst);

void setup(void) {

Wire.begin();
RTC.begin();

tft.initR(INITR_BLACKTAB); // initialize a ST7735S chip, black tab

tft.fillScreen(ST7735_BLACK); // Clear screen

if (! RTC.isrunning()) {
tft.println("RTC was NOT running!");
// following line sets the RTC to the date & time this sketch was compiled
RTC.adjust(DateTime(__DATE__, __TIME__));
delay(3000);
tft.fillScreen(ST7735_BLACK); // Clear screen

}
}

void loop() {
tft.setCursor(10,0);
tft.setTextColor(ST7735_WHITE);
tft.setTextSize(1);
tft.println("INSTRUCTABLES.COM");
tft.setTextColor(ST7735_YELLOW,ST7735_BLACK);//set text color & size for DATE coming from TinyRTC
tft.setTextSize(2);
tft.setCursor(5,30);
DateTime now = RTC.now();
tft.print(now.year(), DEC);
tft.print('/');
tft.print(now.month(), DEC);
tft.print('/');
tft.print(now.day(), DEC);
tft.println(' ');
tft.setCursor(15,70);
tft.setTextColor(ST7735_GREEN,ST7735_BLACK); //set color for TIME
tft.setTextSize(2);//set text size for TIME coming from TinyRTC
tft.print(now.hour(), DEC);
tft.print(':');
if(now.minute() < 10) {
tft.print('0');
tft.print(now.minute(), DEC);
}
else {
tft.print(now.minute(), DEC);
}
tft.print(':');
if(now.second() < 10) {
tft.print('0');
tft.print(now.second(), DEC);
}
else {
tft.print(now.second(), DEC);
}
tft.println(" ");

}

ptosaure11 months ago
Hi, I have a problem with the library, in my sketch it's written :

In file included from sketch_sep21a.ino:12:
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:9: error: stray '\302' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:9: error: stray '\267' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:9: error: stray '\302' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:9: error: stray '\267' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: stray '#' in program
In file included from sketch_sep21a.ino:13:
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:9: error: stray '\302' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:9: error: stray '\267' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:9: error: stray '\302' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:9: error: stray '\267' in program
In file included from sketch_sep21a.ino:13:
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:315:46: error: exponent has no digits
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:316:62: error: exponent has no digits
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_ST7735/Adafruit_ST7735.h:599: error: stray '#' in program
In file included from sketch_sep21a.ino:12:
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:4: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:403: error: expected constructor, destructor, or type conversion before 'const'
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '=' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected constructor, destructor, or type conversion before '.' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected constructor, destructor, or type conversion before '.' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected constructor, destructor, or type conversion before '.' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token
C:\Users\Bichon\Desktop\arduino-1.0.3\libraries\Adafruit_GFX/Adafruit_GFX.h:552: error: expected unqualified-id before '<' token


I have try other version and other library but they don't work... coul'd you help me please
Thank you
syahirjapar11 months ago
can you guide me sir?
jmh430811 year ago
The DHT sensor and display are working fine. When I try to compile this sketch on either the 1.01 or 1.05 IDE environment I get

sketch_aug18a:17: error: expected constructor, destructor, or type conversion before numeric constant
sketch_aug18a.cpp: In function 'void setup()':
sketch_aug18a:23: error: request for member 'attach' in '11', which is of non-class type 'int'
sketch_aug18a.cpp: In function 'void loop()':
sketch_aug18a:78: error: request for member 'temperature' in '11', which is of non-class type 'int'
sketch_aug18a:82: error: request for member 'humidity' in '11', which is of non-class type 'int'
sketch_aug18a:86: error: request for member 'fahrenheit' in '11', which is of non-class type 'int'
sketch_aug18a:91: error: request for member 'kelvin' in '11', which is of non-class type 'int'
sketch_aug18a:96: error: request for member 'dewPoint' in '11', which is of non-class type 'int'
sketch_aug18a:100: error: request for member 'dewPointFast' in '11', which is of non-class type 'int
Ideas?
johnag (author)  jmh430811 year ago
Check the dht Library.seems like it's Not installed properly
kurtee1 year ago
Very nice instructable!
Don't forget to add the leading "0" for Minutes and Seconds when < 10 on the RTC.
; )
ariemaayan1 year ago
if you are looking to connect RPI + boards or any other combination I found a cheep solution: its called a BOARD_GANIZER check it out especially if you have a bunch of wires,
youtube.com/watch?v=7rqlSpln6U­­­0 found it on newark element14 website and Digikey
http://www.digikey.com/product-search/en?mpart=BG-32618&vendor=377
fishnveg1 year ago
Hi, I have a outdoor fishpond, and like to know any temperature sensor that can be used to monitor the water temp of my fishpond?
johnag (author)  fishnveg1 year ago
https://www.sparkfun.com/products/11050
That.s a link to a senor that may work for you.
lgabbert1 year ago
I finished my monitor this week. It works fine. I changed the color of the seconds from blue to green
johnag (author)  lgabbert1 year ago
Cool.. if you can, share a picture..glad someone else enjoyed building it as much as I enjoyed sharing it.
bremus1 year ago
So how can I datalog all the info for tracking?
johnag (author)  bremus1 year ago
You could probably log the data into a Micro SD card using the built in card slot on the display. I haven't tried that .. yet. Otherwise, you can log to your PC if you keep the USB cable plugged and use the serial.print ( ) command in addition to , or instead of the tft.print commands.. i.e replace all tft with serial and it will display on the arduino serial monitor -check the examples that come with the DHT libraries.
skamsie1 year ago
hello,

i have a question. What is the "2" for in " tft.print((float)DHT11.humidity,2);" ?

Thanks
ghauptman1 year ago
This is the one I ended up buying. I'm hoping I am able to incorporate it into your current project. I should have all the parts in the mail shortly.

http://www.amazon.com/dp/B009A525QS/ref=pe_309540_26725410_item
ghauptman1 year ago
John great instructables! I just ordered the parts online. Hopefully I can put it together correctly. Anyway you could also show how to add a barometer to it? I also wanted that to get measured and displayed.
johnag (author)  ghauptman1 year ago
If you want to have barometric pressure you will need a better sensor: check this one out http://www.adafruit.com/products/391 .They have all kinds of sensors, so browse around, it really depends how much you're willing to invest.
You won't have any problems putting this together . It really is an easy project, but if you need help just let me know.
thomasaw1 year ago
For an alternative DHT library, see here: https://github.com/adafruit/DHT-sensor-library
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