Sketch board

Installed (portable and local installations). Make sure you are running the Arduino IDE where you installed the ESP32 add-on.4. A fatal error occurred: “Failed to connect to ESP32: Timed out… Connecting…”When you try to upload a new sketch to your ESP32 and it fails to connect to your board, it means that your ESP32 is not in flashing/uploading mode.Having the right board name and COM por selected, follow these steps:Hold-down the “BOOT” button in your ESP32 boardPress the “Upload” button in the Arduino IDE to upload a new sketch:After you see the “Connecting….” message in your Arduino IDE, release the finger from the “BOOT” button:After that, you should see the “Done uploading” messageThat’s it. Your ESP32 should have the new sketch running. With those boards/with that setup, after uploading a new sketch, press the “ENABLE” button to restart the ESP32 and run the new uploaded sketch.You’ll also have to repeat that button sequence every time you want to upload a new sketch. But if you want to solve this issue once for all without the need to press the BOOT button, follow the suggestions in the next guide:[SOLVED] Failed to connect to ESP32: Timed out waiting for packet headerTo be honest we’re not sure why that happens with the newer boards. We don’t have any ESP32 board with that behavior. We think there might be something different with your specific board or the Arduino IDE fails to send the right command sequence to put the ESP32 automatically in flashing/uploading mode.5. Error compiling WiFiScan sketchIf you try to upload the ESP32 WiFiScan.ino sketch provided in the ESP32 Getting Started guide:And it fails to compile with a similar error message:In function ‘void setup()’:ScanNetworks:52: error: ‘class WiFiClass’ has no member named ‘firmwareVersion’String fv = WiFi.firmwareVersion();It looks like your Arduino IDE is compiling the WiFi library for the Arduino board (instead of using the ESP32 WiFi library).Note: you’ll probably never use any WiFi shield with your Arduino board, right? If you don’t use it, you need to remove that folder/those folders from your Arduino IDE (move it to your desktop, for example).The WiFi library is located, in a similar path:C:\Users\ruisantos\Downloads\arduino-1.8.7-windows\arduino-1.8.7\libraries\WiFiAnd/or at:C:\Users\ruisantos\Documents\Arduino\libraries\libraries\WiFiAfter removing the entire WiFi library folder from one location or both locations, restart your Arduino IDE and try to compile the code again.If you plug your ESP32 board to your computer, but you can’t find the ESP32 Port available in your Arduino IDE

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WiFi board.Pushing Sketch to the CloudA final step you will want to do is to “push” your modified sketch back up to the Arduino IoT Cloud. This will bring the cloud copy of the sketch back in sync with the local copy and allow you to continue working on the sketch using the cloud editor if you wish.Pushing a sketch is similar to pulling it. Go back to the Sketchbook, open the Cloud Sketches, and find your sketch. Hover over it to see a couple of icons. The one on the left is the “pull” icon you used to pull the sketch from the cloud. The one to its right is a “push” icon, a cloud with an arrow pointing inward.Click on the push icon. You will be informed that you are about to overwrite the cloud copy. Acknowledge the warning and proceed. The sketch will sync back to the cloud.Working with the Push Button Cloud VariableNow we have the code on the device updated to interact with the push button and change the state of the button_state cloud variable. Let’s work with that variable.Open the Thing you built and verify that the associate device (the Uno R4 WiFi board) is online. Now, look at your cloud variables. You should have two:button_state – A Boolean representing the push button. It should be HIGH when the button is pressed.servo_position – An Integer that sets the servo motor position from 0 to 180 degrees.Beside each variable are two values:Last Value – The last recorded value of the variable. Note that if the variable has never reported a value, this will be blank.Last Updated – A timestamp for the value. Again, it will be blank if no value has been recorded.Note the value in the button_state and press the pushbutton. The value of the cloud variable should now go HIGH. Release the button, and it should go LOW. Examining the stats of your cloud variables is an excellent troubleshooting tool; keep it in mind if one of your Arduino IoT Cloud projects doesn’t work as you expect it to.Updating the DashboardFinally, we should put a widget on our dashboard to interact with the button_state variable. The LED widget is a good choice; this is a general-purpose indicator that can be set to red, green, or bi-color.Go to your dashboard and put it into Edit mode so you can modify it.Open the Widgets drop-down and find the LED. Open it and attach the button_state cloud variable to it. Save and position the widget.Now, try the push button. It should toggle the LED.Adding a Second Device (ESP32)At this point, congratulations are due. You have added your Uno R4 WiFi board to the cloud as a

Pot_value cloud variable in your ESP32 Thing.Before you close the properties for the gauge, edit the range so it is 0 to 4095. This is the output of the 12-bit A/D converter in the ESP32.Now watch the gauge while you rotate the potentiometer shaft. You should see it track the movement with the value displayed.OTA UpdateBefore we move on, we need to unplug our ESP32 from the computer. Disconnect the USB and use a power bank or adapter to power the ESP32. Verify it is back on the cloud by moving the potentiometer and observing the dashboard.Now go into your cloud editor with the same sketch ESP32 we have been working on. On the top corner (beside the “upload arrow” you will see a board icon. Next to that, you’ll see the board status. It should say Over-The-Air. This means OTA updating is now available for this board.With OTA updating you can update the sketch without connecting the board to your USB port. Any board on the IoT Cloud can be updated in place. Very handy when you have boards deployed everywhere!Now, let’s edit the code to include the LED. When we are done we can update Over the Air!LED Code UpdatesThe code for the LED is pretty simple. First, in the declarations, we define the pin we are connected to: // Define pin for LEDconst int ledPin = 4; In Setup, we set the pin as an Output. Finally, we modify the callback function that the Arduino IoT Cloud wrote for us to update teh LED based upon the value of cloud variable led_control: // Drive LED with cloud variabledigitalWrite(ledPin,led_control); Now do an update, just as you would with a connected board. The procedure is identical, and after verifying your sketch, the OTA update will begin. It goes pretty quickly.When the update is done, you’ll get a message saying it was completed successfully.LED Dashboard ModificationsReturn to your dashboard, put it in edit mode, and look for a push button wizard. Attach it to your led_control cloud variable. Then, test it out.As you probably have come to expect by now, the push button wizard can control the LED on the ESP32.But we also have another push button, the physical one attached to the Uno. How could we get it to control the LED on the ESP32?Device-to-DeviceDevice-to-device communication is a great feature you can implement in the Arduino IoT Cloud. You do it using Synchronized Cloud Variables.You can synchronize variables from different Things, and you can synchronize more than one variable. The only requirement is that the variables are of the same type. So don’t try to synchronize a boolean with an integer; for example, the IoT Cloud won’t even let