DHT11, DHT22 Sensors

[bestes]

@micho111 here is a link to some code that @Ian used to get his dht11 online and working.

DHT11, DHT22 Sensors

Thanks Benny! Throw me under the bus . Here’s the bottom line up front- When it comes to code, I know just enough to be dangerous! This is a conglomeration of the Adafruit DHT and Cayenne code. I’m sure there is a better or more correct way to do it, regardless here it is- DHT_Cay.txt (3.2 KB) YMMV, -Ian

Once you get going, don’t forget about our project submission contest going on right now!

Submit Your Cayenne Projects! [contest ended]

Hello Cayenne Community! For the months of September and October, we want to see the projects you are making with Cayenne! If you’ve used Cayenne before, then you know how easy it is to create projects. And if you’re new to Cayenne, then start making because you can easily create a project in less than hour! The rules are simple, and there is a prize for everyone who submits a project! Grand Prize $200 - The Cayenne team will vote on their favorite project for the month of Septemb…

Cheers,

-B

[bestes]

Woohoo! Look at you go!

As always, keep us all updated with your progress and reach out if you need help with anything. There are guys on the Cayenne community ready to help out. (And much smarter than me )

Talk soon,

-B

[lance2]

Benny, if I wanted to send one of the community members code to a project, how do I do it?
I tried to copy and paste the code into a reply to his message and it showed up in a couple of different fonts and random parts of the code were gone.

[adam]

You can highlight it all and click the pre-formatted text button at the top of the box. It looks like </>

[jquiros]

I’m also looking forward to the dht support. Have been using a pi for 3 years with mrtg and thingspeak with several dht22’s and just came across and immediately installed cayenne!
Jon Q

[copperslov]

As I am new to the all stuff, based on your experiences, do you think that with Arduino, Cayenne and DHT_Cay.txt code can I hang several (multiple) DHT22 sensors and make a viable automation project? I need several DHT sensors in the project.
Bestes, pls add me on the list.
thanks

[adam]

Welcome to Cayenne!

There are 2 options now. You can use Arduino and make custom code to send the values to the dashboard (scroll up for that) or you can also now do it with the Pi using MQTT. http://www.cayenne-mydevices.com/docs/#bring-your-own-thing-api

[israelmx]

Hi Adam,

I hope you are very well, I saw that now we can add the DHT11 with Raspberry Pi, that is a great knew, I tried to find some videos that help me to understand how could I add this client (DHT11), do you know if there is any information about it?.

Thanks in advance.

[craigfrancissfco]

Hey, so, i know I’m the 1billionth person to ask… But will this be supposed under “sensors” soon? I REALLY would love this and it seems like you’ve been saying its in the pipeline for a long while…

[adam]

It’s possible now with Node-RED/MQTT. I’ll make something up here in the next few days. If you want to try to figure it out on your own here is all the info you will need:

node-red-contrib-dht-sensor

Using Node-RED as a Local Fallback Server

Required items: Raspberry Pi with the newest image of Raspbian Jessie (Node-RED is pre-installed) A client device (Arduino, Pi, or any other microcontroller that has an MQTT library) Arduino IDE Overview: Cayenne will be a display for our data and easy to use interface. The Raspberry Pi will be a local server for our client device to send data to. Through Node-RED we can create functions that are currently missing from Cayenne such as time delay buttons, GPIO interrupts, and add sensors t…

So install the node-red-contrib-dht-sensor node then put that node in to an mqtt output node with all your Cayenne credentials and it will show up on the dashboard.

[bestes]

@craigfrancissfco @israelmx @copperslov @jquiros @chris.wood @woz @pallottamrc @jrustling @mikejunor_cayenne @ravter

Hi guys,

@adam created a great tutorial for adding the DHT11 / 22 sensor to the Cayenne dashboard using the Cayenne MQTT API. I realize this is probably not what you had in mind, but you can now read data from your DHT11 sensors, and send the values to Cayenne from the Raspberry Pi! I’m hoping you will give it a try, here is the post you can reference:

DHT11/DHT22 with Raspberry Pi

About This Project This project will read temperature and humidity from a DHT11 or DHT22 sensor and send the values to Cayenne using MQTT. The python MQTT client and Adafruit DHT sensor library will need to be installed for this script to run. Install the software prerequisites using the commands below: sudo pip install paho-mqtt sudo apt-get install build-essential python-dev python-openssl git clone https://github.com/adafruit/Adafruit_Python_DHT.git cd Adafruit_Python_DHT sudo python …

[bestes]

@Christian @lobopt @somnet @roccodegrazia @linux87s @glasermrk @adytoader @raspberrycoulis @marthinus.swanepoel @mase.hacker

Hi guys,

@adam created a great tutorial for adding the DHT11 / 22 sensor to the Cayenne dashboard using the Cayenne MQTT API. I realize this is probably not what you had in mind, but you can now read data from your DHT11 sensors, and send the values to Cayenne from the Raspberry Pi! I’m hoping you will give it a try, here is the post you can reference:

DHT11/DHT22 with Raspberry Pi

About This Project This project will read temperature and humidity from a DHT11 or DHT22 sensor and send the values to Cayenne using MQTT. The python MQTT client and Adafruit DHT sensor library will need to be installed for this script to run. Install the software prerequisites using the commands below: sudo pip install paho-mqtt sudo apt-get install build-essential python-dev python-openssl git clone https://github.com/adafruit/Adafruit_Python_DHT.git cd Adafruit_Python_DHT sudo python …

[bestes]

@hiren.shah @nicolasortuzari @faljeremy @brucecalder @timwellington @mat_oldaker @will @Mr.Allen @dzachareas @maurifree

Hi guys,

@adam created a great tutorial for adding the DHT11 / 22 sensor to the Cayenne dashboard using the Cayenne MQTT API. I realize this is probably not what you had in mind, but you can now read data from your DHT11 sensors, and send the values to Cayenne from the Raspberry Pi! I’m hoping you will give it a try, here is the post you can reference:

DHT11/DHT22 with Raspberry Pi

About This Project This project will read temperature and humidity from a DHT11 or DHT22 sensor and send the values to Cayenne using MQTT. The python MQTT client and Adafruit DHT sensor library will need to be installed for this script to run. Install the software prerequisites using the commands below: sudo pip install paho-mqtt sudo apt-get install build-essential python-dev python-openssl git clone https://github.com/adafruit/Adafruit_Python_DHT.git cd Adafruit_Python_DHT sudo python …

[israelmx]

@bestes

@adam created a great tutorial for adding the DHT11 / 22 sensor to the Cayenne dashboard using the Cayenne MQTT API

Hi Bestes,

Great, thank you so much, just wonder if with the MQTT API we could see the widgets in iOS?, I know for sure that the web page will be, but not sure in the app, because I was playing with the ESP8266 and the MQTT API does not shows the widget in iOS but in the web does.

Have a great evening.

[adam]

You’re right, the apps do not have support for mqtt yet. It’s coming.

[rilldeverill]

Another DHT11 request please!

Thanks,

And IFTTT support please.

[mbphillips83]

Adding myself to the list. Did my best to use other examples for manually adding dht11, but I’m afraid that creating Arduino sketches is a bit above my head. Would be nice if the dht could just be added in the dashboard the way I added my actuators - that was pretty straightforward.

[toms]

Hi, thank you for the great apps.
Connected like a charm, even do not ask a password

Could you please send docs for put custom data from DHT22 to Cayenne?

Thank you.

[Bernie]

This Works with NodeMcu with DHT22
You will have to remove all the / from the #include lines, I put them in so it displays here correctly. This is not my code, I pulled it out of another sketch after hours of pulling my hair out.

/#define CAYENNE_PRINT Serial // Comment this out to disable prints and save space

/#include <ESP8266WiFi.h>
/#include “CayenneDefines.h”
/#include “BlynkSimpleEsp8266.h”
/#include “CayenneWiFiClient.h”
/#include <DHT.h>
/#define DHTTYPE DHT22
/#define DHTPIN 4 //NODEMCU D2
/#define VIRTUAL_PIN V1
/#define VIRTUAL_PIN V2

DHT dht(DHTPIN, DHTTYPE, 20);
float humidity, temp_c;

long lastTempUpdate = 0;

// Cayenne authentication token. This should be obtained from the Cayenne Dashboard.
char token = “TOKEN”;

// Your network name and password.
char ssid = “YOUR SSID HERE”;
char password = “WIFI PASSWORD”;

IPAddress ip;

void setup()
{

Serial.begin(230400);
Cayenne.begin(token, ssid, password);
dht.begin();

}

// ==============( Void Loop ) ====================================

void loop() {
Cayenne.run();
unsigned long now = millis();
if ( now - lastTempUpdate > 60000 ) {

gettemperature();
Serial.print("Sending temperature:");
Serial.println(temp_c);
Serial.print("Sending humidity:");
Serial.println(humidity);
lastTempUpdate = now;

}

}

void gettemperature() {

humidity = dht.readHumidity();          // Read humidity (percent)
temp_c = dht.readTemperature();     // Read temperature as Farenheight


// Check if any reads failed and exit early (to try again).
if (isnan(humidity) || isnan(temp_c)) {
  Serial.println("Failed to read from DHT sensor!");
  return;
}
String TempC;
String Humid;
TempC = String(temp_c);
Humid = String(humidity);
Cayenne.virtualWrite(V1, temp_c);
Cayenne.virtualWrite(V2, humidity);

}

[lpporres1]

Requesting support as well. Love Cayenne!!!