Documentation for Wifi-Enabled Data Logging - System Control By: Jesse Jenkins

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1 Documentation for Wifi-Enabled Data Logging - System Control By: Jesse Jenkins Code for this project is found on Github: For getting started with Blynk, check out the following weblinks: Blynk Blink Tutorial: There are lots of examples in the existing Arduino Blynk Library: For implementing more advanced code check out: Documentation for Blynk 1. Setup Hardware 1.1. Connect your ESP device to the MAX6675 thermocouple module with breadboard leads 1.2. Connect your Ksensor to the MAX6675 thermocouple module, these pins may differ depending on your ESP board.comm. Protocol is SPI (Serial Peripheral Interface) VCC (3.3V) - Yellow => 3V GND - Brown => G CLK - Clock line - Blue => D5 => GPIO DO - Digital Sig- Orange => D6 => GPIO Chip Select - Green => D7 => GPIO Plug in USB to ESP and Upload Github Sketch to Blynk Provisioning Install Arduino 1.8.0, it works, Don t use Arduino or web version Download the github repo, the sketch is the *.ino file called Esp_logger Configure sketch for ESP board that you have Optional: Configure pin for LED for indicator This can even be an RGB led!! Optional: Configure Pin for Button functions- (hold down button so you can easily connect device to other networks and apps) Optional: Name the Wifi broadcast SSID i.e. Metabolizer Install the ESP8266 library v or newer in Arduino IDE in tools>boards>board manager..> search for esp8266 and install Select the board in Arduino IDE under tools>board> NodeMCU 1.0 ESP Install the Blynk library v or newer in Arduino IDE in sketch>libraries>add libraries >search for Blynk To compile, the following settings must be selected: board: NodeMCU 1.0 (ESP12-E Module)(this also works for other boards, select your board if you see it in the list). Flash Size: 4M (1M SPIFFS) Debug port:: "Disabled" Debug level: "None" IwIP Variant: "v2 Lower Memory" CPU Frequency: "80 MHz" Upload Speed:

2 works best, higher can also work Erase Flash: "All flash contents" Port: Whatever your USb-FTDI is Once compilation is successful just click upload and wait for it to say Upload Done Plug in ESP to USB power and connect to the ESP network Metabolizer with your computer Open a browser on your computer after connecting to the network and navigate to Enter in the information for your Blynk Server, your internet or local router s SSID and password, and your API device key (key is gathered from Blynk app in Step 2) Your blynk server IP address may differ depending on your setup. For example, if you re using a private or local server you d enter that information. If you re using the default Blynk cloud server the info is: Server: blynk-cloud.com (or whatever your private/local server is called) Port: 8080 (or whatever your private/local server has configured) API Key: adf hasdkfjb (not valid) SSID: Your Network s Name Password: Your Network s password Press submit while you re watching the device over the serial monitor (step 1.3) Troubleshooting: You should see the device successfully connect to Blynk, if you see API key rejected, or Blynk Can t connect, check that your router s information is entered correctly, that it s not an enterprise network,,that it has internet access, that it s not a 5 GHz network. 2. Setup the App on your phone Download and Install Blynk from the App Store on ios or from google Store on Android Create a login/username 2.3. If you re planning to use a local or private server you can click the port icon when logging in and enter the IP and port. Otherwise, just move on as usual. 3. Create a new app/device This will prompt you to enter a device name, and specify the type of device. We re using the ESP8266. Blynk will generate an API key which is how your device will authenticate with the Blynk cloud server. This hexanumerical string needs to be in sync with your device, you can enter it into step Once a device is setup, you can start adding widgets to an App and connect those to your device

3 3.3. Create an App Drag a widget on to the blank dashboard of the app from the widget-box. You access the widget-box by swiping to the left To add some features you may have to pay a litle bit of money to try them out (smart graphs for example) Add a widget to your dashboard Drag a labeled display widget onto your dashboard Configure, resize, or move around the widget by tapping it or dragging it when you re not in Play mode Configure the labeled display pin to be connected to a virtual pin V Name this widget Temp: C Update Frequency should be set to PUSH (push means the firmware in the device will determine to send new information to Blynk, we use a timer to send the data in the ino file) Create another labeled display widget to be connected to V Call this widget Temp: F Optional: Add a gauge and/or superchart to display data over time Stream data over wifi Make sure your ESP device is powered on and connected to the Blynk server. You can verify this in Arduino IDE with the serial monitor Make sure your mobile device has access to internet and the Blynk server Press the play button in your app on your mobile device If the device is not connected you will see a red flag on the device icon in your Blynk app If the device is connected you should see data coming through your widget boxes Other Tips and Tricks The ESP device can run on battery power and be wireless You can put the device to sleep to conserve energy using the ESP API Read Blynk Documentation for doing more advanced things Cant use delay for more than 1 second with ESP otherwise the watchdog will cause the device to reset with an error code so write your code to be non-blocking and use timers and/or interrupts to control time-sensitive tasks Add an RGB LED for easy visual of device status i.e. Blynk library already has built in library for states : can t connect to network (green), cant connect to Blynk server (aqua blue), error (red), connected (whatever you want), provisioning mode (breathing blue) Add a button to easily put the device into provisioning mode (when its boardcasting its own SSID) Make an enclosure to protect the electronics

4 Device is dependent on an internet connection unless you have a private or local server setup Device can only be connected to 2.4 GHz networks, WPA2-PSK, Absolutely, no 5 GHz, or enterprise systems (with login or splash page) Congratulations you did it! Give yourself a hand.

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