Introduction: ESP-8266 Live Instructable View Counter
Second Prize in the
Internet of Things Contest 2017
If you have ever created an Instructable, you will no doubt be familiar with the satisfaction of watching the amount of views on your instructable increase over time. What is even more satisfying, however, is to create a device that displays how many views you have on a 7 segment display, in real time.
Making such a device is surprisingly simple as only a few components are required.
In particular, an ESP-8266 board is used which connects to the internet and processes the data itself, meaning a web server or computer is not required to retrieve the data.
Even better, the project can be built for around £20 or ($25), excluding tools.
So, let's build!
Step 1: Concept
To display the amount of views, a commonly available dual 7-segment display module is used which incorporates the MAX7219 shift register.
To power the project, a micro USB phone charger is used which is directly connected to the ESP-8266.
The device is housed in a laser cut case, cut from 3mm Plywood. If you do not have access to a laser cutter, you can simply use an online service to cut the parts, or modify an existing enclosure to accommodate for the parts.
Lastly, I take no responsibility or liability for any loss or damage to personnel or property.
Step 2: Parts List
To build the view counter, you will need the following parts and tools. I have compiled a table with links and prices to make it easier to source these parts. Please note these prices are only current at the date of publication and are for guidance only.
|Part (As labeled in diagram)||Retailer & Link||Cost|
|1- Electrical tape||Amazon||$3.94|
|2- NodeMCU ESP-8266||$8.79|
|3- Needle-nose pliers||$6.45|
|4- Laser cut pieces|
|5- 7 Segment module|
|6- Female to female jumpers *||$5.99|
|7- Hot glue gun||$10.59|
|8 - Micro USB charger||$8.79|
*Note: Only 5 female to female jumpers are needed.
I live in the UK, but to help readers from America I have tried, where possible, to include American suppliers and rough prices.
If you are having difficulty sourcing any of the parts used in this Instructable, comment and I will try to help.
Step 3: Cut the Enclosure
The enclosure compromises of 6 pieces, which interlock together. Use the PDF attached at the end of this Instructable to cut the pieces out of 3mm Plywood.
Note: In this Instructable, I will refer to the laser cut pieces as the names shown in the picture.
Step 4: ESP-8266 Preparation
To keep the unit as compact as possible, the headers of the ESP-8266 need to be bent at a right angle to allow the components to be stacked.
To do this grip the headers on one side and bend them outwards, being careful not to exert too much stress on the PCB. Repeat this for the other side, individually bending any headers that are not well aligned.
Now individually bend pins GND, 3.3V, D7, D8 and D9 (all on the same side) so that they are at a 45 degree angle to the PCB (as shown with the jumpers). Insert the female jumpers into the pins and check that there are no issues. Once satisfied remove the jumpers.
Step 5: Mounting the 7 Segment Module
If the headers are straight, bend the input headers on the module so that they are at a right angle, making sure the pins faces away from the displays.
Place the front panel on a flat surface, text side down and press-fit the display module, checking that the decimal points face away from the text on the front of the panel (as shown). If it does not fit, try wiggling the 7-segment displays until they do.
When satisfied, apply gentle pressure to the module and apply hot glue between the 7-segment displays and the panel (as shown).
Step 6: Wiring
Insert the 5 female to female jumpers onto the display module input headers. Connect the other end of each jumper to the corresponding pin on the ESP-8266. Note that the display module input headers are in the same order as the output headers (which are labelled), the only difference being DOUT and DIN, as shown.
The wiring is shown below:
Step 7: ESP-8266 Instillation
To install the ESP-8266, first line the back of the display module with electrical tape as this prevents against electrical shorts.
Next slot in and glue the port panel, making sure the slot is facing away from the front panel. If needed, add a top/bottom panel to stop movement, but do not glue it yet.
Then insert the ESP-8266 into the slot at a slight angle angle and press it down so it fits on top of the display module. If it does not fit, try bending the pins outwards so that they fit over the module then re-bend them back to their 45 degree angle. Also, check that all the headers are still connected.
When satisfied, install the remaining panels, except from the back plate applying hot glue if desired.
Step 8: ESP-8266 Reinforcement
To stop the ESP-8266 moving around, first gather some scrap plywood or other material that is 3mm thick. Ensure the ESP-8266 is properly lined up and protrudes through the slot.
Apply some hot glue to the scrap material (shown as white dots in the photo) and place it behind the ESP-8266. Then press the back-plate on and apply general pressure. Wait for a couple of seconds then remove the back plate. The scrap material should now be firmly attached. If desired add more hot glue to reinforce it.
Finally, press the back plate back on, making sure the scrap material is supporting the ESP-8266. I found that the back panel does not need to be glued on as it holds itself well, plus the unit can be opened later if required.
If you do wish to glue it, remove the panel, apply glue to the top corners and press it down.
Step 9: Library Installation
To program the ESP-8266, first make sure you have the latest Arduino IDE installed. Then install the ESP-8266 board definition by following this guide, selecting 'NodeMcu 1.0' instead of the 'Sparkfun ESP 8266 Thing' .
The next step is to install the three libraries. Do this by downloading the .zip from the following places:
Instructables API library: https://github.com/witnessmenow/arduino-instructab...
Arduino JSON: https://github.com/bblanchon/ArduinoJson
Led Control:Ihave attached a .zip of the LED control library which I had to modify (explained below) as I had problems compiling the code with the original one.
If you are unfamiliar with installing a .zip library,the official guide can be found here.
For anyone interested in the modification I made, I had to change line 30 to 'pgmspace.h ' in the ledcontrol.h file to allow it to compile, as it kept looking for an AVR chip, which the ESP-8266 is not.
Step 10: Code Configuration
Import the code attached at the end of the Instructable into the Arduino IDE and replace the following sections as shown and as commented in the code:
Line 37: replace the dotted lines with your network SSID (name). This can be found by looking at the network settings on any wireless device connected to your network. This can also be found on the back of your router.
Line 38: replace the doted lines with your network password/key, which can be found on the back of your router.
Line 39: replace the dotted lines with the author's username of the instructable you want to monitor.
Line 40: as shown above, replace this with the ID of the instructable you want to monitor. To find this, first find the desired instructable in Google Chrome and right click anywhere on the page. Then click 'view page source' or hit Ctrl + U. Now hit Ctrl + F and type in 'LogHit'. Replace the lines in the code with the first string of letters in the brackets.
Note: Make sure you do not remove any quote marks (") or semi-colons (;) when replacing the dots.
Step 11: Upload and Testing
The final step is to upload the code. Do this by connecting the ESP-8266 to your computer with a micro-USB cable.
Ensure that you have the 'NodeMCU 1.0' board selected, and that the correct COM port is selected. When ready hit the upload button, or press Ctrl + U.
To use the view counter, apply power and let it connect to the internet. It will display the amount of views as soon as it has a connection. You can place the counter on a surface, or stick it to a wall using silicone or other adhesive.
I hope you have enjoyed this Instructable, and if you have any questions please comment below.
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