Intro: Things You Can Do With Old Phones
I get a lot of old electronics out of the waist bin, everything from phones to computers and printers. Old and obsolete phones are one of the old electronics I get the most and I use them for a variety of different things, this Instructable is on two things you can use old, broken, and obsolete phones and their parts for.
In this Instructable I am going to show you how to use a phone as a battery charger, and make a glow in the dark Logo or picture frame.
I got the Idea of a glow in the dark Logo from Instructables Q&A when another member asked about a phone LCD pin outs (Liquid Crystal Display) looking for the backlight LED pins. (Light Emitting Diode)
Step 1: Wireless Phones As a Battery Charger
Many of the phones I get are working other than needing a battery or they are just obsolete and are discarded simply because the owners got a new phone, this opens opportunities for me.
The batteries come in two standard voltages and a variety of millamp hours, 3.6 Volts from 300 Mah to 900 Mah and 2.4 Volts from 300 Mah to 700 Mah Ni-Cd batteries. However they come with a variety of different connectors.
Step 2: Converting a Phone Into a Battery Charger
To change a phone into a battery charger is easy, start by converting the phone into a universal battery holder. You will need one for 3.6 volts and one for 2.4 volts.
Start by removing the battery cover on the back of the phone by pressing on the top of the battery cover and pulling it down.
Once you have the battery exposed unplug it and put it to one side.
Inside you should find two screws and a sticker indicating battery polarity, if the battery polarity is not indicated inscribe the polarity yourself.
Then remove the screws and carefully pry off the back of the phone.
Step 3: The Battery Socket
The battery socket is a plastic guard designed to make sure only selected batteries can be attached to the phone. Take an edged tool and pry the plastic socket off the circuit board leaving the pins attached to the circuit board. As long as you only use a 3.6 volt battery in a 3.6 volt phone and a 2.4 volt battery in a 2.4 volt phone you should not experience any problems no mater what the milamp hours. However larger batteries with more milamp hours need more space to fit in the phone so use a phone that takes the larger batteries.
Then reassemble the phone and attach a battery to the pins making sure to connect it to the pins with the correct polarity, the first time one of these batteries are charged it can take up to ten hours.
After that just place the phone in the charger and charge the battery, changing the battery as the dead ones become fully charged.
Step 4: Glow in the Dark Logos and Picture Frames
I got the Idea for the glow in the dark logos and picture frames from an Instructables member that wanted to know which pins light up the backlight of an LCD module from a phone. (Liquid Crystal Display)
I have done something similar to this with flat screens from computers.
Step 5: LCD Module Construction
The graphic LCD module in most these wireless phones is very much like Nokia 5110 and 3310, excepting the number of pins and the backlight LED is on a separate part of the circuit board. (Light Emitting Diode)
A lot of these phones are made with COG LCDs, (Chip On Glass Liquid Crystal Display). COG LCDs have the control IC on the LCD taking less room on the circuit board for the control IC. (Integrated Circuit)
The LCD module of these phones is constructed much like most LCD modules and they consist of:
Optical Plastic Layer
Step 6: My Glow in the Dark Logo
I wanted a larger glow in the dark logo so I used a backlight assembly from an ITT office phone LCD about 2.5x3.5 inches.
The LCD is constructed much the same as the LCD on smaller phones, the backlight consisted of a reflective layer an optical plastic layer and a LED strip made out of eight LEDs two in series making four lines in parallel.
Step 7: Tools and Parts
Optical Plastic Layer
9 volt battery terminal
9 volt battery
Trim for framing
Step 8: Assembling the Logo
First I soldered the 9 volt battery terminal to the LED strip.
Then I cut the positive wire in two and soldered the switch onto the positive wire.
Once the wiring is assembled I tested the LED strip to make sure it is working.
It’s that simple.
Step 9: The Logo
You can use anything you want printed on photographic paper as the reflective layer of your glow in the dark logo. I used an Instructable Logo I received in the mail as my logo and added the reflective layer to fill in the rest of the backing.
Place the optical plastic on the face of the logo making sure to have the etched side of the optical plastic towards the Logo and attach the LEDs making sure the LEDs face the edge of the optical plastic.
I used tape to hold the logo together and tested it to make sure it worked as planned.
Step 10: Then Frame It.
You can use a picture frame or like I did I used plastic framing from a window frame to frame together the glow in the dark logo and amaze your friends.