A Modern Solution To Tea Bag Inventory Management

Britain is famously known as a land of manners and hospitality. Few situations could make an Englishman’s stiff upper lip quiver, short of running out of tea bags while entertaining house guests. Thankfully, [The Gentleman Maker] is here and living up to his name – with a helpful tea monitor to ensure you’re never caught out again.

The Intelli-T, as it has been dubbed, monitors tea inventory by weight. An Arduino Uno combined with a HX711 IC monitors a load cell mounted under a canister, with a reed switch on the lid. Upon the canister being open and closed, the Arduino takes a measurement, determining whether tea stocks have dipped below critical levels. If the situation is dire, a Raspberry Pi connected over the serial port will sound an urgent warning to the occupants of the home. If there is adequate tea, the Raspberry Pi will instead provide a helpful tea fact to further educate the users about the hallowed beverage.

It’s a fun project, and one that has scope for further features, given the power of the Raspberry Pi. A little more work could arrange automatic ordering of more tea online, or send alerts through a service like IFTTT. We’ve seen [The Gentleman Maker]’s uniquely British hacks before, such as the umbrella that tells you the weather. Video after the break.

Hack a Day 21 Feb 06:00

Relativty is a low-cost VR headset you can build yourself

While you’ve been hearing about virtual reality for the last 20 years or so, today the hardware required to build such a rig is finally to the point where it’s within the reach of consumers. As seen here, Relativty is a SteamVR-compatible headset that can be made for around $100.

Relativty uses a 3D-printed frame to house its 2560 x 1440 LCD screen, along with a pair of 80mm Fresnel lenses to properly focus the image. Control is accomplished via an Arduino Due and an MPU-6050 accelerometer, which feeds head-tracking info to an external gaming system. 

At this point, the device is clean though fairly basic, and will hopefully be the start of a truly excellent open source project as features are added.

Rav Vast LED Drum Light

This project is a small, battery-powered LED ring that fits perfectly inside of your Rav Vast drum. It uses color-changing RGB LEDs and a microphone that allows you to change the color or pattern with changes in volume.You don't need any special skills for the construction (though you may pick some ...
By: stevearc

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Instructables 20 Feb 19:15

Easy to Implement UI || OLED Display With Joystick & Buttons

This module has an OLED display with two buttons, 5-way joystick and a 3-axis accelerometer. This is useful in setting up UI for a project.Hey, what's up guys? Akarsh here from CETech .Today we are going to take a look at an all-in-one module which is very much usefull in rigging up a quick UI hardw...
By: AkarshA2

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Instructables 20 Feb 17:28

Ever Blooming Mechanical Tulip

Everlasting flower for your everlasting love. A perfect not-only Valentine's day gift to your loved one. This mechanical tulip will bloom into any color possible with just gentle touch of your hand. Its six petals will slowly open and light up. When petals are closed they create incredible ambient l...
By: jiripraus

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Instructables 20 Feb 14:35

Simple Creation - Light Alarm

This experiment is really interesting – to apply a DIY phototransistor. DIY phototransistors use the glow effect and photoelectric effect of LEDs – they will generate weak currents when some light is shined on it. And we use a transistor to amplify the currents generated, so the Arduino Uno board ca...
By: primerobotics

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Instructables 20 Feb 12:35

ADXL345 Using Arduino Uno R3

In this lesson, we will learn how to use the acceleration sensor ADXL345. - Arduino Uno board * 1- USB cable * 1- ADXL345 *1 - Breadboard * 1- Jumper wires An accelerometer is used to measure the force generated during the acceleration. The most fundamental is the commonly-known acceleration of ...
By: primerobotics

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Instructables 20 Feb 12:09

Custom Firmware For Cheap Fitness Trackers

The concept of wearable hardware is an enticing one, but it can be difficult to tackle for the first-time maker. While many of us are experienced at designing PCBs and soldering up arcane gadgets, interfacing with the soft and fleshy human form can present unforeseen difficulties. There’s a way around that, of course – leveraging an existing platform where someone else has already done the work. That’s precisely what [Aaron Christophel] has done, by reverse engineering and developing custom firmware for cheap fitness trackers (Google Translate).

The first part of [Aaron]’s work consisted of research and disassembly. After purchasing a wide variety of fitness trackers online, he eventually came across his favored unit, the Tracker I6HRC by IWOWNFIT. This features an NRF52832 microcontroller, as well as an IPS display, some Flash storage, and a vibration motor. Connectivity is handled over Bluetooth Low Energy. [Aaron] particularly rates it for the well-made case that can be disassembled without damage, and the spare USB 2.0 pads on the board which can be used to program the device over the SWD interface.

[Aaron] has developed an Arduino-compatible firmware which is discussed further in a forum post.  Most of the peripherals on board have been explored, and reducing power consumption is a current area of active development.

Firmware hacks are always fun – have you considered giving your TV a custom boot screen? Have a FitBit original instead of the clone? There’s a hack for that too.

[Thanks to Jim for the tip!]

DC Motor Control Arduino Uno R3

In this experiment, we will learn how to control the direction and speed of a small-sized DC motor by a driver chip L293D. Making simple experiments, we will just make the motor rotate left and right, and accelerate or decelerate automatically. - Arduino Uno board * 1- USB cable * 1- L293D *1- Sm...
By: primerobotics

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Instructables 20 Feb 11:46

NE555 With Arduino Uno R3

The NE555 Timer, a mixed circuit composed of analog and digital circuits, integrates analog and logical functions into an independent IC, thus tremendously expanding the applications of analog integrated circuits. It is widely used in various timers, pulse generators, and oscillators. In this experi...
By: primerobotics

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Instructables 20 Feb 11:29