DIY ant killer

Homebrew ant killer made from sugar, borax, and water is very effective in keeping ants out of the house. Dissolve a half cup of sugar with 1.5 tablespoons of borax into 1.5 cups of warm water. Then dip a cotton ball into the solution and set it on a countertop (where kids and pets won’t eat it). The ants will flock to it and 12 hour later, you won’t see any more ants for a long time. Get a one-pound bag of borax on Amazon for $8.50 (which you can also use to make slime).

Image: Balaram Mahalder/Wikipedia

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Multiple Monitors With Multiple Pis

One of the most popular uses for the Raspberry Pi in a commercial setting is video walls, digital signage, and media players. Chances are, you’ve probably seen a display or other glowing rectangle displaying an advertisement or tweets, powered by a Raspberry Pi. [Florian] has been working on a project called info-beamer for just this use case, and now he has something spectacular. He can display a video on multiple monitors using multiple Pis, and the configuration is as simple as taking a picture with your phone.

[Florian] created the info-beamer package for the Pi for video playback (including multiple videos at the same time), displaying public transit information, a twitter wall, or a conference information system. A while back, [Florian] was showing off his work on reddit when he got a suggestion for auto-configuration of multiple screens. A few days later, everything worked.

Right now, the process of configuring screens involves displaying fiducials on each display, taking a picture from with your phone and the web interface, and letting the server do a little number crunching. Less than a minute after [Florian] took a picture of all the screens, a movie was playing across three weirdly oriented displays.

Below, you can check out the video of [Florian] configuring three Pis and displays to show a single video, followed by a German language presentation going over the highlights of info-beamer.

Filed under: Raspberry Pi

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DIY Raspberry Pi Indoor Outdoor Webcam

In the boot partition, the one you see on windows, add a file named wpa_supplicant.conf and edit it in notepad. Copy and past the code below, and edit the ssid and password variables.

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
ssid=”SSID”

psk=”PASSWORD” }

Then add a blank ssh.txt file to turn on ssh.

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British place-names generated by a neural net

Dan Hon (perfecting earlier work by Tom Taylor) trained an AI on the vast corpus of British place names, then set it loose. The results are amazing, illustrative of an uncannily human humor seemingly at work, something you’d never get from the standard syllable-randomizing place name generators of yore.

"There aren’t as many cocks as you’d think," he writes.

My favorites: Brotters Common, Boll of Binclestead, Farton Green Pear End, Weston Parpenham, Sutsy Compton, Stoke of Inch, Kinindworthorpe Marmile, Rastan-on-croan, Fuckley, Fapton, Waterwitherwell.

See also Hon’s AI trained to generate Ask Metafilter post titles.

Surely neural-net-generated Liffs are next.

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Continuous Surface Bracelet

This bracelet consists of differentiated gyroids, i.e. infinitely connected triply periodic minimal surfaces.The 3D printed result is a rigid porous structure that separates space into two oppositely congruent labyrinths of passages. Create the Differentiated Gyroids 1 Create a regular gyroids ne…
By: DianaS150

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IoT Air Quality Sensor

MQ2 and MQ9 gas sensor both have four pins:

  • VCC
  • GND
  • DO (Digital Control)
  • AO (Analog Output)

The analog output of MQ2 and MQ9 is between 0V to 5V whereas the analog pin of nodemcu can only read between 0V to 3.3V. That means nodemcu cannot read the data if MQ2 or MQ9 sensor output is above 3.3V. The data read is not accurate. Therefore, voltage is needed step down.

In this project, voltage divider by two resistors is used. The voltage output is determined by the ratio of the value of two resistors. I use 180ohm as R1 and 330ohm as R2 so that Vout is 3.3V.

So, Vin is connected to AO pin of MQ gas sensors. Vout is connected to channels of the multiplexer.

Only three pins of each sensor are used:

  • Vcc to 5V supply
  • GND to nodemcu GND pin
  • Vout of voltage divider to CD4051BE channel 1 and channel 2(pin14 and 15)

Multiplexer connection:

  • Vdd (pin 16) to 5V supply
  • INH, Vee, Vss (pin 6, 7, 8) to nodemcu GND pin
  • common out/in (pin 3) to nodemcu A0 pin
  • A, B, C (pin 11, 10, 9) to nodemcu D0, D1, D2

A, B, C (pin11, 10, 9) are used to select channel for output.

A, B, C are digital input which means only read 0 and 1.

3-digit binary number is formed in the order of CBA.

As we use channel 1 and 2, denary number of 1 and 2 in 3-digit binary number are 001 and 010 respectively.

Therefore, when we want output of channel 1, D0 output 1, D1 and D2 output 0.

When we want output of channel 2, D0 output 0, D1 output 1 and D2 output 0.

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Blynk+GSM Sim800+Arduino Uno+DHT11

Download Blynk App from Play Store link below

http://ift.tt/2lZposj…

Steps:

Open the App

New Project > Give a name to Project > Choose Device Arduino Uno > Connection Type GSM > Create

Auth Token was sent to your email id registered

> Press OK

>Click on + sign > Add Gauge x2, History Graph, Notification, Email

> Click on Gauge 1st Give name Temperature INPUT as Virtual V1, range 0 to 100

> Click on Gauge 2nd give name Humidity INPUT as Virtual v2, range 0 to 100.

> Click on History graph in 1st column give name Temperature Input as virtual v1, 2nd column give name as humidity input as virtual v2.

>Install email & Notification

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