Arduino Wifi Temperature Logger

This is a simple demo using the ESP8266 and Cactus Micro (a arduino compatible board) to update a remote server (https://data.sparkfun.com/) using a digital temperature sensor.

Step 1: Materials

The Cactus Micro is an arduino compatible dev board, it integrated a WIFI chip ESP8266.

• 1 x Cactus Micro - contains a ESP8266 module ESP-11 (https://www.tindie.com/products/AprilBrother/cactus-micro-arduino-compatible-plus-wifi-esp8266/)

• 1 x DS18B20 Digital Temperature Sensor

• 1 x 4.7k resistor

• 1 x Power supply (4.3V up to 12V, I used a 3.7v)

Step 2: Connecting the Wires Together

• Connect esp8266 module is easy. Just plug in to the pins.
• DS18B20 - DQ(2) -> Cactus pin 14, DQ(2) -> 4.7KR -> VCC(3.3V)

Step 3: Arduino Setup and Sketch

The sketch code: https://github.com/AprilBrother/cactus-micro/blob/...

For Cactus Micro Rev2, the default firmware for esp8266 is espduino. Please use this sketch instead. https://github.com/AprilBrother/cactus-micro-r2/tree/master/libraries/CactusMicro/examples/temperatureLogger

Step 4: SparkFun Setup

We create a data stream at SparkFun, follow this link to do this. https://data.sparkfun.com/streams/make

Once you've created your stream, keep the window open so you have easy access to your public and private keys handy - you'll need those to replace the KEY in the Arduino sketch.

Now you are ready to start sending data.

Comments

[herneise]

hi,

could you update the code for cactus micro rev2 please?

trying, but i can not.

question: how long data keeps on sparkfun? (the free one)

[yanc]

Hi, We've updated the sketch for Cactus Micro Rev2 today. It should work with default esp8266 espduino firmware.

https://github.com/AprilBrother/cactus-micro-r2/tree/master/libraries/CactusMicro/examples/temperatureLogger

[OlexS]

Can you make it reading temperature from several sensors? Should it be like example below or there is better way? Thanks.

tempSenNum++;

if (tempSenNum > 3){

tempSenNum = 1;

}

switch (tempSenNum) {

case 1:

DeviceAddress thermometer = { xxxxxxxxxxxxxxxxxxxxx }; //sensor #1

break;

case 2:

DeviceAddress thermometer = { xxxxxxxxxxxxxxxxxxxxx }; //sensor #2

break;

case 3:

DeviceAddress thermometer = { xxxxxxxxxxxxxxxxxxxxx }; //sensor #3

break;

}

[anthonyjclarke]

My order from Tindie arrived... ready to build... but link for code not there...

https://github.com/AprilBrother/cactus-micro/blob/master/examples/arduino/temperatureLogger/temperatureLogger.ino

[yanc]

Hi,

I have just updated the link for the sketch.

Please note: the code is only work on rev1. You must change the code to hardware serial port Serial1.

[UkritK]

Hi there,

I'm interested in using this Cactus micro in my project for sending data to a website.

Do the flash memory,ram and ROM stack when I use it with Arduino Uno? Or any different in term of speed?

Thank you

[yanc]

You should compare it with Arduino Leonardo or Arduino Micro. The micro controller is ATMega32U4.

[Akin Yildiz]

it's coming along yanc, look how cool the cactus micro look inside the plant pot..

https://www.instructables.com/id/the-plant-pot/step...

[yanc]

It looks great! I

[yanc]

I made some change with your code. Not tested. I replace some "Serial" with the SoftwareSerial port "debug". Please diff the code.

https://gist.github.com/volca/da178cd000abb91d649f

[Akin Yildiz]

i copied your code above and using IDE 1.0.6 now - still no online upload, also the temperature is really high all the time, very strange.

.

still never AT+CWMODE=1 or AT+CWJAP lines shown on the serial monitor;

temperature1021

light256

water53

AT+CIPSTART="TCP","184.106.153.149",80

AT+CIPCLOSE

temperature1022

light252

water33

AT+CIPSTART="TCP","184.106.153.149",80

AT+CIPCLOSE

.

i still think it is the code, rgb led works with the right colors and sensors are picking up data as well. just no online connection

[yanc]

For test WIFI connection, please make it simple. Run the sketch below.

https://gist.github.com/volca/69c559cfb50e5580668c

[Akin Yildiz]

Module Test: OK

AT+CWJAP="8d59bb","244221619"

....................Can not connect to the WiFi.

Module Test: OK

AT+CWJAP="8d59bb","244221619"

....................Can not connect to the WiFi.

Module Test: OK

AT+CWJAP="8d59bb","244221619"

....................Can not connect to the WiFi.

Module Test: OK

AT+CWJAP="8d59bb","244221619"

....

keeps repeating this. isn't it supposed to first set the mode, AT+CWMODE=1 ? this line doesn't showup on the software serial monitor..

[yanc]

I edited the line 31:

Original:

delay(500);//delay after mode change

Edited:

delay(3000);//delay after mode change

Give it enough time. It will connect the WIFI easy. I just tested the sketch and it worked.

[Akin Yildiz]

Module Test: OK

AT+CWJAP="8xxxxxb","2xxxxxx9"

.....OK, Connected to WiFi.

.

yes it did work.!! now how can we add in the sensors and leds like here;

https://drive.google.com/file/d/0B8bvYGugxvFFYjJoN...

.

thank you so very much once again..!!!

[yanc]

I replaced the function connectWIFI in the previous sketch. Please have a try.

https://gist.github.com/volca/da178cd000abb91d649f

[Akin Yildiz]

actually i think i solved the problem.

on the serial monitor the code never prints - debug.println("AT+CWMODE=1");

this maybe why,

-

Module Test: OK

AT+CWJAP="8xxxb","2xxxx9"

.....OK, Connected to WiFi.

temperature1019

light481

water0

SEND: AT+CIPSTART="TCP","184.106.153.149",80

GET /update?key=9TYUWTFXTYC9RKT8&field1=1019&field2=481&field3=0

[yanc]

Change the line

debug.println("AT+CWMODE=1");

to

sendDebug("AT+CWMODE=1");

You will see it on the serial monitor. It's not the problem.

[Akin Yildiz]

how about this,

on my sketch; https://drive.google.com/file/d/0B8bvYGugxvFFYjJoN...

at the very end line, i have;

cmd = "AT+CIPMUX=0";

sendDebug( cmd );

if( Serial.find( "Error") )

{

debug.print( "RECEIVED: Error" );

return false;

}

you didn't include above part in your final sketch here; https://gist.github.com/volca/da178cd000abb91d649

i remember reading that this line is very important for successful upload. i tried including it myself but didn't still no success, i'm not sure where exactly it has to go however, maybe you can include it

.

also, looking at other esp8266 posts here, i notice that after AT+CIPSTART the monitor prints AT+CIPSEND=(a random number?)

when I used esp8266 rev-01 on my previous project this is what the serial monitor looked like - picture 1

picture 2 is how it looks like with your final sketch right now.. thingspeak channel still doesn't receive any data.

[yanc]

I just added the code after line 63. Please have a try.