#nodemcu

[positivefumo]

Koishi got a message for you!

[undeadswarm]

My electronic elements organizer is finally ready!

[quartz-components]

NodeMCU ESP8266 Development Board 

#NodeMCU #ESP8266 is an open-source development board specially targeted for #IoT based Applications. It includes firmware that runs on the ESP8266 Wi-Fi SoC from Espressif Systems, and hardware which is based on the ESP-12 module. Learn more: https://components101.com/development-boards/nodemcu-esp8266-pinout-features-and-datasheet 

[codingheroesonline]

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Who needs to buy a mechanical keyboard when you can build something like this!! - Make sure to check out @hacksterio feed and website for all the cool projects you will ever want to build!! - - - #embedded #arduino #arduinouno #arduinoproject #diyelectronics #electronicslovers #electronicsprojects #microcontrollers #robot #robotics #proteus #sensor #nodemcu #esp8266 #electronicsengineer #electronicengineering #raspberrypi #raspberrypizero #raspberrypi3 #iot #iiot #coders #codelife #coderlife #atmega #armcortex #armcortexm4 #arduinodesigns (at Busan, South Korea) https://www.instagram.com/p/CBcJ5TbjSLt/?igshid=xrpbd9lz3g0h

[settorezero]

Upgraded my Gameboy Printer Server using an original dmg-04 cable. I had a broken Gameboy from which I've salvaged the female link connector, now the printer server can be used with original Nintendo cable 😊 . . . . . . . . #nintendo #gameboy #nodemcu #esp8266 #wifi #retrogamer #retrogaming #retrocomputer #retrocomputing #associazione64 #settorezero #makersgonnamake #makersmovement #nerd #geek #gadget #gameboycamera #8bit #engineering #developer #tech #salvaging https://www.instagram.com/p/BuO-br1Heho/?utm_source=ig_tumblr_share&igshid=9tvnbg81mtgl

[michaelteeuw]

MusiCubes - Part 6: Touch Me Four Times

It's been a few months since I've finished my MusiCubes Controller. And although most of the controller works perfect, there is one issue that is still bugging me: the false positives of the touch sensors. Time to fix this!

Originally I tried to solve this issue by taking some counter measures in the software:

Touches when no music was playing were ignored.

Touches shorter than 50ms were ignored.

And although this solved most of the false positives, it still wasn't perfect. Mainly the volume down button was triggered every once in a while, resulting in a mute state after a few hours of playing. Also the fact that I couldn't turn the volume all the way down before starting the music was a minor inconvenience as well. A modified touch system should solve this.

I originally added one plate of brass on each side of the the MusiCubes tray to handle the touches on the designated surface. The plates of brass were 40x30 mm, allowing me to touch the designates surface anywhere I wanted.

The Solution

The idea is to split up the touch surfaces in 4 sections each. Since I am using the MPR121 Proximity Capacitive Touch Sensor Controller which has 12 touch sensing inputs, connecting these four sections doesn't require any extra electronics.

Whenever the MPR121 reports a touch, I'll count the number of active touch surfaces. By setting a threshold of a minimum of 2 surfaces, false positives on one of the touch surfaces will be ignored.

Let's start cutting up the original brass plates!

I had used some hot glue to mount the brass plates to the MDF. A small screwdriver and a bit of force aloud me to pry of the glue and remove the plates. Removing the glue from the plates and cleaning them up was very a satisfying job.

Cutting the pieces of brass up into four sections was an easy job for my Dremel multitool, so soon enough I ended up with 8 small brass plates.

With an overdose of hot glue, I glued the four pieces back in place, making sure the four pieces didn't touch. The hot glue is a perfect isolator for this!

Next I connected four pieces on both sides to their respective MPR121 sensors. Note to self: next time solder the wires to the plates before glueing them in place, because the soldering heat melts the glue.

And with this modification done, it's time to modify the code.

To quickly count the number of active fields, I added a method to my TouchManager:

uint8_t TouchManager::activeFields(uint8_t sensorIndex) { uint16_t state = _sensors[sensorIndex].touched(); uint8_t count = 0; while (state) { count += state & 0x1; state >>= 1; } return count; }

If the number of active fields is above the threshold, I handle the touch like I did in the previous version. For the full modification of the code, check out this commit on GitHub.

The Big Discovery

To test if this works, I added some logging to report the false positives. Which brought me to my big discovery: the false positives of the sensors were completely gone! It turns out the false positives where caused by the fact that the original brass plates were to large. With four small plates, the MPR121 was much more reliable. As a matter of fact, I haven't had a single false positive in two weeks time! The issue was completely gone! Even though the touch surface is still as large. Awesome!

Because of this, I didn't need a threshold of 2 touched surfaces. In stead I can just respond to any touch detection. And because there aren't any false positives anymore, I can enable the tough controls even when there isn't any music playing.

Victory!

Turn Down The Heat

And with the touch changes, the hardware of the MusiCubes is almost perfect. Almost. Unfortunately there still was one minor issue. The system is powered with a Micro USB power supply, directly into the NodeMCU USB connection. This means that the Neopixels are powered over the same connection.

Unfortunately the USB power goes trough a diode on the NodeMCU board, to prevent any power going into the USB port. But this means the 1 amps that are necessary for the NeoPixels flow through that diode as well. It works, but the diode gets hot. Too hot.

To fix this, I added an external USB connector that directly feeds the 5V into the Neopixel power lines, as well as the the NodeMCU. The tiny diode no longer has to deal with the power hungry LEDs.

And with this change, all of the issues are solved!

The MusiCubes controller really turned out to be a perfect companion to my Sonos sound system. Starting and stopping the music is so simple that even my 3 year old son casually controls the music from time to time. It took a while to convince him to play something else then Disney's Moana music though ...

[jakeimakei-blog]

Wifi temperature logger aka “NodeMcu Arduino IDE MQTT DHT11 Node”. Part 3 (Node Red and dashboard)

In previous two tutorials we learned how to set up ESP8266 with arduino IDE as temperature sensing node. Now we gonna look Node Red side of things and will create dashboard for displaying the data.

Read More...

[quartz-components]

IoT Based Air Pollution Monitoring using NodeMCU and MQ135 Sensor

There are different types of gas sensors to detect different gases. Here in this project we are going to use MQ135 gas sensor to sense the pollution content in the surrounding area and then to monitor these values over the Webpage. The circuit consists of a simple connection and takes fewer components to have your own IoT based air pollution monitoring system. In this project, at first, we will be knowing about the MQ135 sensor and its internal circuit. Later we will be building an air pollution monitoring system using nodeMCU and MQ 135 gas sensor and interface an LCD (16X2) display to nodeMCU, to show the pollution content value. Later on, we will connect the nodeMCU to our LAN, by providing the SSID and password credentials and then we will be generating a webpage where we send the sensor data. The page will be refreshed for every time interval to show the updated values.

COMPONENTS REQUIRED

MQ135 gas sensor

NodeMCU

LCD (16X2)

Breadboard

Connecting Wires

View the full tutorial