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Pinch Harmonics on an Electric Guitar
How to 3D Print Onto Fabric
Easy to Do Photography Hacks
Nucleo Guitar Effects Pedal
Custom Guitar Case
A Best Kept Secret to Losing Weight
How to Make a Remote Control Snake
Aragoscope: Scrap Hard Disc As a Prototype Space Telescope
Customizable Electric Guitar / Design Process
Nice!You could use the RPI onboard GPIO pins and spare the arduino for another project
Hand Crafted Guitar From Recycled Wood
"try to recover the dead batteries by giving them a jolt of electricity" :oPlease pay attention to potentially damaged li-po batteries. They can explode and start a fire!Have a look at this other instructable for some tip to spot damaged cells https://www.instructables.com/REUSE-YOUR-OLD-LA...
What Could Go Wrong...
Overview of Quadcopter Components / How to Select Parts
If by "cheap" you mean the HW cost, you don't need anything more, except maybe the data cable
No, sorry, I was thinking about a solution where instead of dtmf you can send SMS to the bike phone. The Arduino read the sms trough the data cable (or the Bluetooth) via some AT commands and then takes some action (disconnect the engine, send gps position, whatever). There is no need for the end user to know at commands. The main difference between your solution and this one is the Arduino being able to communicate back to the bike owner
So you used an old mobile (maybe you could state it in the instructable). It could easily give you the chance to send sms and retrieve GPS data. You could write a small app, or even use something like tasker if the old mobile is a smartphone. Otherway you could probably still connect the arduino to the phone via the data cable and send it AT commands.
Van conversion to small camper
How to fix your check engine light.
Object tracking robot
Cheap Solar Fridge
the pencil drone
Removing Rust with Citric Acid
Make Your Own Smartwatch
Make yourself anonymous on the web!
Cylindrical Mirror Art
D.I.Y. Portable battery pack
Croccolino Pet Feeder!
diy hubsan hexacopter rebuild
Arduino Finite State Machine and multitasks
ARDUINO MPPT SOLAR CHARGE CONTROLLER (Version-3.0)
Hack your servo V1.00 - Turn your servo into a powerful linear actuator
how to make a linear actuator
Light Seeking and Obstacle Avoiding Robot
Optical Mouse Odometer for (Arduino) Robot
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Solar Battery Charging
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SOLAR POWERED ARDUINO WEATHER STATION
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Ultimate Raspberry Pi Home Server
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Poor Man's 3D Printer
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Arduino + 2 Servos + Thumbstick (joystick)
The Only knot you need to know.
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How to hack a servo for continuous rotation - TowerPro MG995
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Control your motors with L293D and Arduino
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Frankenstein Laser Engraver
Yet Another DIY Diode Laser Engraver
Burning Laser with Joule Thief
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(POV) Persistence Of Vision Globe
Hack a TowerPro Micro Servo to Spin 360 / Continuous Rotation
Custom Arduino Micro Quadcopter Concept
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How to build the one motor walker!
Analog Output - Convert PWM to Voltage
Arduino Webserver Control Lights, Relays, Servos, etc...
Turn a pencil drawing into a capacitive sensor for Arduino
2-Player Pong Game Using Arduino Uno and 8x8 Led Matrix
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Persistence of Vision Wand
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James - Your first Arduino Robot
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EWaste 60$ 3DPrinter
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Color Recognition Lock
MintyBoost! - Small battery-powered USB charger
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Easy Garage Storage and Bench