My plan is to now mash up all three into one project.
I will make an app that will send Web. It looks like this…. The rest is really up to the Foscam camera to serve up the live stream…. The LED controls are just sending some custom strings using the Web. PutText function. The magic will happen on the upcoming Arduino code. Here is the AppInventor code….
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I am only going to cover the additional Arduino code I add to implement the AppInventor functionality here. The rest of the program has been detailed in many of my previous post. The first step is really simple. Here is the code snips…. This all actually started working very well initially.
Each channel corresponds to a client so the server can send messages to a specific client. The ESP seems to have a limit to only be able to hold open 5 open IPD channels and then stop accepting any more connections. PutText button clicks were coming in on IPD channel 0 consistently. BTW — I will include a link at the end of this post for the full Arduino code to get the complete picture. The delay is obviously in the video path. Can you reduce the video resolution for less delay in the video feed?
Like Like. I was thinking there might have been a delay for the LED control command to get to the Arduino through the network.
I tested that and found the LED is changing almost immediately after I click the button on the Android App when connected though 4G so you were correct. The entire delay is in the camera stream path. It helped for sure but then much harder to see the LCD numbers increment. Guess will have to live with one or the other. Hi Peter! I have two more questions though:.
I mean if you are on the other side of the world. How can access to my ESP? I am guessing you are sending the close command to try to close the ESP channel since it seems to only be able to hold 4 open at one time.Our goal will be to basically collect information from a local unit and send it to the internet. A user anywhere on the planet looking at this information will make decisions by sending remote commands to the actuators, which will also be in this local unit. Any sensor or actuator could be used.
So, I decide here to return to that time with a little bit more of experience now and explore again those great devices, connecting them to the cloud, using the ThingSpeak. The local unit will also receive data from the internet, "reading" them from specific ThingSpeak Actuator Channels. An Android App will be also be reading those data from the ThingSpeak. Same way, the user, based on that status info, can send commands to actuators, writing them on ThingSpeak Actuator Channels See the above Block diagram to better understand the flow of data.
So, what we will do? The block diagram shown in next step will give us an overview of the final project:. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson.
Using common sensors, our project will capture several data, sending them to the cloud, where everyone can see them thru the internet. To work those data, we will use the service provided by ThingSpeak. So, the idea will be to capture those data from the sensors, for example, a plantation and send them to cloud. Based on those data, a user should take the decision based on those statements:. Let's assembly the Project HW.
The ideal is install and test our project by parts. As a suggestion, we can follow the steps:. We must have some libraries installed on our IDE to read the sensors properly. Check if you have all libraries installed.
How To Use App Inventor With Arduino
Their initial configuration should be:.Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson.
The wiring is very simple. To be more specific you need to do three connections:. To be able to program it you need to connect as the programming cable too. If you use the Adafruit cable I recommend then you just plug it in with the black wire to the GND pin as shown in the picture above. To set-up this please follow the tutorial on the Adafruit website.
To set-up this go to www. Once you did that go to this section to create an API password. App Inventor - You need this to create your mobile App Android. To set-up this please go to App Inventor website and press the button Create Apps. Follow the instructions on the website. You might need a Gmail address to authenticate there. A lot of people are familiar with this and considering the simplicity of the code I think it can do the job quite well.
I assume you followed the instructions from Adafruit tutorial mentioned in the previous step. Once you did that please download the code I provide here Temperature. You have to modify a few things in the code to make it work.
Basically you have to append your user name, colon sign and password and encode the whole string using base 64 encoding. You can use this site www. For example if your user name is "user" and your password is "password" then you create this string:. The password is the Api Password and not your login password.
The user is your email you use for login. There is one more thing that we recommend to change but let's not do it until you understand the inner workings of the entire project is the device Id. Last thing is to compile and upload the code on your ESP board. Once you completed the previous step it is recommended that you verify the communication with the cloud.
If you are familiar with the debug in Arduino please use serial communication to check if everything is OK. The picture above shows you how to do it.
You should see the picture above. The steps you need to do are:. The logic is fairly simple. You should get a confirmation the device is started and it runs. Once you are set-up with App Inventor you can go and import the Temperature.Whenever the client in this case, the Android App sends a request, the ESP Servers accepts it and performs relevant operation. Relay Module: A two channel relay module is used in this project but only a single relay is being used.
After creating a new project, you will see a screen on which you can layout different objects like Buttons, Sliders, Textbox, etc.
ESP8266 Controlled with Android App (MIT App Inventor)
Create an interface similar to the one shown below. It consists of three Buttons, few Labels and a Web Component. After arranging all the components and finalizing the App layout, switch to Blocks section from the top right corner. In the Blocks section, create blocks like shown in the following image. You do not have to create the exact same App. You can finish off with a minimalistic design and interface. After completing the Blocks section as well, you can debug the App directly from the Browser and an Android Phone without actually installing the App.
For this, you have to download and install two Applications: one in your computer and other in your Android Phone. I will not go into the details of this, but if you want further information, you can find it here. Finally, after you are done with the interface, blocks and debugging if any of the App, you can download the.
NOTE: To download. First, make all the necessary connections as per the circuit diagram and upload the program to the ESP WiFi Module. Thanks for the project. I will tested out. I would like know u have created project for DTH11 humidity and temprature with relay control function. If you mean the includeit is part of the ESP board automatically added to the library when you add the board. Hello sir, How to connect to an available wifi network from the app itself by selecting the available wifi network and provide password from there without giving ssid and password in the program?
Your email address will not be published. Table of Contents. Dear sir, Thanks for the project. Hi sir, thanks for this helpful tutorial actually I am a beginner at coding, I would like know u have created project for DTH11 humidity and temprature with relay control function.
From where include library being downloaded. I am not getting proper github link to download. Can I know is the ESP coding is same with the wifi shield to control the relay?
Leave a Reply Cancel reply Your email address will not be published.App Inventor is a visual, easy-to-use online Android Application development platform. Aside from the basic programming language constructs, all you need is a method of accessing your Internet enabled devices. Here is what I have come up. And App Inventor only provides an http interface.
The solution was right there…. All I had to do was setup a basic communication scheme with this and MQTT communication would be possible. The IoT device that subscribes to the topic then detects the request, acts on it, and returns a reply via an MQTT topic publication. The rest of the sequence should be obvious. Just one user action provided: Click on the button to select an MQTT request and wait for the reply string to appear. They can be easily customized for your own system requirements.
The App Inventor code could be refined, if desired, to make it more user friendly. But for this example, raw strings are suffice. Just change the text in the list for your own MQTT topic payloads. This file, locally stored in the Android SDcard, is open when the App starts. More about that later in this article. When one of the request options are selected pickedthe WebViewString is set to this request value.
While I do not prefer to use polling loops, that was the only mechanism I was able to come up with for this. The polling timer is set to repeat every ms, or 10 times per second. Since I already had a working MQTT webpage from a prior projectit was simply reused for this example. Of course, the irrelevant parts were remove and the WebViewString object was added.
File installation instructions are provided in the GitHub repository for this project. The initialization code first brings in the required MQTT and jquery libraries from online sources:.
My next step will be adding non-volatile configuration for the MQTT parameters. This will provide the capability to change MQTT brokers and topics without changing the contents of the installed html file.
I running mosquitto mqtt broker on windows machine by running the command: mosquitto -v.Pages: . Hello everybody, i have build a app with MIT app inventor. The app controlls a nodemcu ESP In this app i can controll some relays. Now i would like to send data temperature from the nodemcu to the app. But i don't know what i have to do now. I searched a lot of theatrs in the internet since four days. How do I have to write the program in Arduino? How do I have to build the right app in app inventor?
Does anyone have suggestions? I hope you can help me. PNG GotValue' to get the response. Electrical Engineer. Okey thank you for your information.
I'm sorry i connot understand u. I have now visit a lot off websites to get some informations. But i don't found the right one. Can u explain me this part again. Can you make a example? It would be very nice.
Thank you very much kind regards. Hey, I tried the above code and got the following error: 'class WiFiServer' has no member named 'on' 'class WiFiServer' has no member named 'send' 1 Could you help me to solve this error 2 and my purpose is to send data from the node MCU server to MIT app client without any request from the app.
Please reply asap!Add the following snippet to your HTML:. Our project will capture local data, send them to the cloud, where everyone can see them through the internet, acting remotely from there.
Project tutorial by MJRoBot. Our goal will be to basically collect information from a local unit and send it to the internet. A user anywhere on the planet looking at this information will make decisions by sending remote commands to the actuators, which will also be in this local unit. Any sensor or actuator could be used. So, I decide here to return to that time with a little bit more of experience now and explore again those great devices, connecting them to the cloud, using the ThingSpeak.
The local unit will also receive data from the internet, "reading" them from specific ThingSpeak Actuator Channels. An Android App will be also be reading those data from the ThingSpeak. Same way, the user, based on that status info, can send commands to actuators, writing them on ThingSpeak Actuator Channels See the above Block diagram to better understand the flow of data.
So, what we will do? The block diagram shown in next step will give us an overview of the final project:. Using common sensors, our project will capture several data, sending them to the cloud, where everyone can see them thru the internet.
To work those data, we will use the service provided by ThingSpeak. So, the idea will be to capture those data from the sensors, for example, a plantation and send them to cloud. Based on those data, a user should take the decision based on those statements:. Some of the most important components listed here, has a link and an indicative price in USD associated.
Those links are for information only. Let's assembly the Project HW.MIT APP INVENTOR 2 -nodemcu wifi car control app
The ideal is install and test our project by parts. As a suggestion, we can follow the steps:. We must have some libraries installed on our IDE to read the sensors properly.
Check if you have all libraries installed. Their initial configuration should be:. And at last, let's write two specific functions, one for reading our sensors and another to display their values on Serial Monitor:. In our case, 9, bauds. Usually, the ESP come programmed from the factory withbaud and we must change it to 9, baud. This is an empty code, to ensure that there will be no communication conflict between Arduino and ESP. This is important for ESP to be able to communicate properly.
At least in my case, I had to use a different command to change BaudRate definitively:. In the selection box at the bottom of your Serial Monitor, change the speed to " baud".
Test the communication: on the upper side of the window type AT and see the answer OK. Use the command:. Keep the quotation marks.
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