Let’s rollback the hobby electronics calendar a few decades with [myvideoisonutube’s] alarm activation control circuit using a matrix style phone keypad. The circuit is quite old using CMOS 4081 with 4 ‘AND’ gates to hardwire the access code. [myvideoisonutube] references [Ron’s] “Enhanced 5-Digit Alarm Keypad” schematic for this build changing the recommend keypad with a more common matrix style keypad found in touch pad phones. These types of matrix keypads wouldn’t work outright for the input so he cut some traces and added hookup wires to transform it into a keypad with common terminals and separately connected keys. We love seeing such hacked donor hardware even when it requires extensive modifications. [Ron’s] source circuit included a simple enough to build tactical button keypad if you can’t find a suitable donor phone.
Learning how to use mostly discrete components instead of a microcontroller would be the core objective to build this circuit outside of needing a key-code access point or other secure 12 V relay activated device. Such a device would be quite secure requiring a 4 digit “on” code and 5 digits for “off”. You couldn’t just pull off the keypad and hotwire or short something to gain access either. The 4 digit on “feature” does knock the security down quite a lot. However, all keys not in the access code are connected to the same point so you could increase your security by using a pad with more keys.
On [Ron’s] site you will find a detailed construction guide including top and bottom view for placement of all the components on veroboard. Join us after the break to watch [myvideoisonutube] demo his version.
Continue reading “5 Digit Security Code Activated Relay Using Mostly Discrete Circuitry”
The wireless charging options available on flagship phones is a great feature, but most of us aren’t rocking the latest and greatest cellphone. [Daniel] came up with a great mod that adds wireless charging to just about every cellphone ever, at a very low price and a few bits and bobs ordered off eBay.
[Daniel] used a Palm Touchstone inductive charger – available for a few bucks on eBay – along with an inductive charging circuit from a Palm Pixi. This charging circuit was designed to complement the Touchstone charger, and is simple enough to wire up; all [Dan] needed to do was put the coil and charging circuit near the charge, and it output 5 Volts to charge any phone.
To get the power from the charging circuit into his phone’s battery, [Daniel] simply wired the output of the coil’s circuit to the USB in on the phone. The space inside his S2 was pretty tight but he was able to come up with two ways to install the charging circuit, for use with either the stock back cover or a third-party case.
For anyone with a soldering iron, it’s a quick bit of work to add wireless charging to any phone. We’re loving [Dan]’s solution, as the Palm gear he used is so readily available on eBay and junk drawers the world over.
[Kees] wanted a remote for an XBMC audio system. He had a classic T65 Dutch telephone in one of his project boxes and thought this phone with the addition of a Raspberry Pi he could have a functional media remote with classic lines and 70s styling.
Each of the digits on the phone were wired up to a small solderless breadboard. With a handful of resistors, [Kees] set up a simple pull up/pull down circuit feeding in to his Raspi’s GPIO input.
With a short Python script, [Kees] managed to map the buttons to XMBC’s play/pause, volume up/down, next, and previous commands. There were a few buttons left over, so those were mapped to online radio stations, playlists, and a strange setting known only as ‘moo’. We’re not sure what that button does, but you can see the other functions of this XMBC phone remote in action in the video below.
Continue reading “Turning a phone into a media center remote”
The Federal Trade Commission really doesn’t like robocalls and other telephone solicitors selling you vinyl siding or home security upgrades. The FTC is even offering $50,000 to anyone who can do away with these robocalling telemarketers, and [Alex] looks like he might just claim the prize. He developed The Banana Phone, a device that eliminates those pesky telemarketers.
The basic idea of the Banana Phone is requiring callers to enter a four-digit pass code (played via text to speech over a relevant song to prevent a bot from getting through) before connecting them to the main line. Once a caller has been verified as human, their number is added to a white list so they won’t have to listen to [Raffi] every time they call.
The Banana Phone uses off-the-shelf parts including a Raspberry Pi and a phone/Ethernet adapter with the total build cost under $100. You can check out a demo of the Banana Phone in action after the break starting at about 2:25.
Continue reading “Getting rid of telemarketers with a Banana Phone”
Back in the days of yore when hats were fashionable and color TV didn’t exist, there were real life people who would answer the phone if you dialed 0. These operators would provide directory assistance, and connect you to another number (such as KL5-8635). Apple’s Siri is a lot like an olde-timey phone operator, so [davis] decided to put Siri in an old rotary telephone.
The build started off with a very inexpensive Bluetooth headset and very old rotary phone. The single button on the Bluetooth headset was wired to a contact of the dial – in this case, the number 1. Dialing 1 shorts two contacts in the phone and the Bluetooth headset turns on.
[davis] came up with a very easy build but dialing 1 just isn’t the same as dialing 0. Connecting the Bluetooth button to 0 closes the button for too long. He says ‘0 for operator’ could be implemented with an ATtiny or similar, but we’re wondering if [davis] could make due with a dial-less candlestick phone.
Continue reading “Dial 1 to get Siri as your operator”
People quickly find out that I am a dork, and their next question typically is “why do you own that old as dirt dumb phone?”. Well to be honest, I don’t like phones. After a decade of Palm Pilots and Windows CE devices, I really don’t like touch screens either (fat man fingers and a bad habit of chewing nails does not help). I also do not like that in order to get a fancy PDA with a radio you usually have to sign up for a data plan, or pay for the thing in full.
Now get off my lawn! Seriously though, I really only need my phone to do two things, make phone calls, and send SMS messages. If I had a wishlist the only other things I would like is mass storage for MP3 files, and Bluetooth. Naturally when I started my new day job I found the geek in the department and shortly there after I got asked about my basic LG flip phone.
After a few days of interrogation I jokingly snapped back with “well since you are so worried about it why don’t you give me a better phone!” With a little hinting around and a bribe of a “Swiss Roll” at lunch, I was given an old HTC phone with Windows Mobile 5.
While it is not exactly an iPhone or an Android, it is much more featured than what I had, and it has a mini SD card slot and Bluetooth! The only catch was, he could not find the charger. We did not know if the thing even worked (he had never seen the thing turned on) , or what condition the battery was in.
As a good little hacker I took it anyway, join me after the break to see me get it fired up and save a quite a bit of change in the process.
Continue reading “You Want How Much for a Phone Charger?”
[Dimitris] decided to build a homemade alarm system, but instead of triggering a siren, sending an SMS message, or Tweeting about an intrusion, he preferred that his system call him when there was trouble afoot. He says that he preferred a call over text messaging because there are no charges associated with the call if the recipient does not pick up the line, which is not the case with SMS.
The system is based around an off the shelf motion detector that was hacked to work with an old mobile phone. The motion detector originally triggered a siren, but he stripped out the speaker and wired it to a bare bones Arduino board he constructed. The Arduino was in turn connected to the serial port of an unused Ericssson T10s mobile phone. This allows the Arduino to call his mobile phone whenever the motion detector senses movement.
The system looks to be quite useful, and while [Dimitris] didn’t include all of the code he used, he says others should be able to replicate his work without too much trouble.