Some days it seems like the phone never stops ringing. The caller ID always says "Toll Free Call" or some other nonsense. I wanted a way to just drop these calls. I was going to use an Arduino to watch the caller ID and answer each one of these calls. I was looking at Audio recorder modules but then I got a Linkit One. With it's built in audio mp3 player it was perfect.
Best part is if you play the official "This number has been disconnected" message most telemarketer dialing machines recognize hose three tones at the beginning and remove you from their active dial list......

Before you think about doing a project that connects to an old fashioned phone line know this.

The ringing signal used in my area is ~90Volts AC at 20 Hz. If you happen to be touching the wires when the phone rings it will feel like you stuck your finger in a light socket. It will hurt for a while. If you have friends like mine they will stand behind you and call you while you try to work on it.......

I use a VOIP system in my house but it supplies standard caller ID signaling on its POTS lines. If your going to use this on the PSTN you may want to go with an FCC approved interface or just grab an old US Robotics modem but I don't have to worry about that so I chose the HT9032D. I got these from Tayda Electronics. Really cheap but they only stock the surface mount package. You could pay more and get a dip package from another supplier but I had some oddball adapter boards on hand....
I used a blank Shield prototype board to hold all the parts. I had some RJ-11 connectors and 600 ohm matching transformers in the parts cabinet. I have a habit of buying stuff like this in bulk.....

Is your child turning 16 anytime soon? Are you worried about them driving and being safe behind the wheel? To give parents peace of mind, I've created a teen driving alert. This device hooks up into your teen's car. Whenever the car turns too hard or stops suddenly you'll receive an alert via text message notifying your of the reckless driving. This way you'll know if they are misbehaving, texting, or maybe just not paying attention behind the wheel. Are you ready to keep your new driver safe? Let's go!

Keeping it pretty simple here with only three items:

• LinkIt One Media Board
• Sim Card
• SparkFun Triple Axis Accelerometer Breakout - MMA8452Q

I had been looking to make my own cymbals for my DTXpress II electronic drumkit. The kit already has 2 but I remembered I could add 2 more so I got thinking and researching.

I watched some videos and they used plates or frisbee's. I originally looked at a cake tin covered in some silicone rubber. Then while looking through my Toolstation catalogue I saw a 180mm sanding disc pads for only a few pounds. That looked perfect! Then I thought what if some piping fitted the frame of my drumkit, and after measuring they were about right! So I purchased the 2 sanding disc pads and 2 T bends, 2 right angle and 2 stoppers.

Ever Wondered Using A Keyboard And a Mouse On You Phone On The Go?
This Instructable Will Guide You To Do So.

Applications-:1)Helping Elders to type using Key Board If They Find It difficult to Type Using Touch
2)Easy To Use,A nice Way To Show Off Your Friends and Family Using a computer Mouse.
3)It Helps Beginners To Learn Faster.

Please Note: You Can Also Use a Usb Mouse Or Keyboard Directly By The OTG Cable,But this way It is more easier

Many AA or AAA battery chargers charge batteries in pairs, but plenty of devices use 1 or 3 batteries, meaning that some of your batteries get overcharged and some get undercharged. NiCd and NiMH batteries also benefit from an occasional full discharge, which most normal battery chargers won't do.
If you're anything like me you'll end up with a lot of rechargeable batteries, none of which end up being charged properly, and some of which turn out to be completely unusable. It'd be perfect if you had a low-power battery charger that you could leave on all the time, that would charge your batteries individually, automatically discharge them, and give you an idea of their real capacity. That's what you'll make in this tutorial!
Note: To make this nice and easy, the charger uses Espruino's GPIO pins to directly charge and discharge the batteries. This means it can't charge batteries very quickly (it can take days to charge and discharge them!). NiMH batteries benefit from an occasional fast charge/discharge, which this charger can't provide without some extra components - so it's not perfect, but it is easy to build and will make sure your batteries are always topped up.

Hi everyone. I was asked to built a quadcopter for educational purposes under 450 dollars. Requirements are having follow me,guided,stabilize, loiter modes etc. low cost, durable, easy to maintain and using an open source platform for development purposes. This is not the best quad configuration but it gets the job done. Hope it will give some idea about such projects.

You can easily find the parts shown belown on hobbyking, ebay, aliexpres sites. Total cost is around 410 bucks.
Parts
1. Z600-V3 with crab landing gear Quadcopter frame
2. Crius AIOP v2 flight controller
3.Turnigy Plush 30A ESC
4.E-max 980kv motors
5.Plastic project housing
6.11.1v 3S HRB 5000mah 50C Li-po Battery
7.XT-60 and T-type connectors
8.U-blox neo7m gps
9.Gps stand
10.Flysky FS TH9X radio set(TX-RX)
11.I-max B6C li-po charger/balancer
12. Double sided copper plate
13.Zip ties and plastic standoffs
14.Power leds and a led driver
15. 433Mhz telemetry module (will be added)
16.USB cable
17.10x4.5 propellers
18. 4mm connectors
19.heat-shrink tubes