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BT
KH
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Two Tone Doorbell Using Ic 555
Saw someone selling a two tone buzzer on Aliexpress for $10. Immediately my brain said, are you serious? Just by investing a little bit of your time and enthusiasm you can make this circuit for under 3 dollars.

Tin The Friendly Robot
A robot that can monitor your wellbeing and act upon what information it gathers, the Google AIY Vision and Voice Kits are used to add facial detection and voice interactivity to this project. The IFTTT service is used to send relevant notifications to your phone.

Atche (attention Checker)
A device to check attention and notify after 25 mins to take rest. Also, notifies when one uses smartphone in the middle of the concentration period.

Air Quality Monitoring Station With Wio Terminal
The Air Quality Terminal can be used as an indoor air quality meter to monitor VOCs, CO, NO2, C2H5CH, Temp and Humidity.

Mqtt On Wio Terminal
MQTT Pub/Sub on Wio Terminal.

Downtime Alarm
A simple system to keep an eye on your server and alert you when it is down.

Madness Machine
A small project with a single evil purpose, fooling people into checking their phones.

Add A Real Clock Calendar To Your Arduino
Use of the MikroElektronika Click Shield for Arduino and a RTC Click Board based on PC8583

Log Essential Features Affecting Plants Using Raspberry-pi
Collect the moisture content, temperature, light intensity from the garden and send it automatically to concerned mail.

Smart Mailbox
In this project, we will create an easy LPWAN (low-power wide-area) application. By using an Arduino MKRFOX 1200 board and the Sigfox network, the post box will send a notification, whenever a letter arrives.

Iot- Plant Irrigation System
Build your own automatic IoT plant irrigation system with soil sensor, Particle Photon, relay and immersible water motor.

Diy Electronic Horn For A Bicycle Or Car
The LM555 generates an electronic horn signal which is amplified by an LM386. The tone and gain of the horn can be easily varied. The horn can be used in a car, scooter, cycle, and motorbike.

Contactless Voltage Detector
3 Ways to Build Your Own Contactless Voltage Detector For Less Than a Dollar

Diy Musical Doorbell
Learn how to make a simple musical bell using the UM66T melody generator IC.

How To Make A Siren Generator
Learn How to Make a DIY Electronic Siren Generator circuit that can produce police car siren, emergency ambulance siren & fire brigade sound using the IC UM3561a Siren Tone Generator.

Washing Machine Notifications
Get your "dumb" washing machine talking to Google Home and Android devices - never forget about the washing again!

Youtube Subscriber Counter - Solderless, 3d Printable, Cheap
I've always wanted a YouTube counter for my channel but they often cost more than I wanted to pay and required a YouTube API key. This design is buildable for under £15/$18, does not need an API key and sits on top of a monitor, stands on a surface or can wall mounted.

Bitcoin Tracker Using A Raspberry Pi
The Bitcoin Tracker can display information such as Price, Bitcoins in circulation, No. of Bitcoins left to mine, Hash Rate, etc