Intro: Coin Radio: Hacking a Radio
Coin Radio is a fun and exciting radio designed for children. It is designed as a novelty way of interacting with the radio compared to the traditional radio design. The child will insert a coin into the top of the radio and watch the coin descend down to the bottom. When reaching the bottom the coin will turn the radio on.
VIEW VIDEO BELOW TO SEE RADIO WORKING
Step 1: Exploded Isometric View
Part Number Part title Material Process Quantity
1 220x5mm side Acrylic plastic Laser cut 4
2 220x180mm front middle back Acrylic plastic Bandsaw 3
3 120x5mm slats Acrylic plastic Laser cut 4
4 207x107mm top and bottom Plywood Bandsaw 2
5 handle Plywood Bandsaw 1
6 Grill Plywood Laser cut 1
7 scoop Plywood craft knife and glue 1
8 Battery box with 2x1.5v batteries ----------- -------------- 1
9 107x50mm sides Plywood Bandsaw 1
10 220x50 front and back plywood Bandsaw 2
11 6mm rods plywood Bandsaw 2
12 Dials metallic Bought 2
13 140x5mm Acrylic plastic Laser cut 1
14 Speaker -------------- ------------ 1
Step 2: Hacking a Radio
We started this project by being given a small portable sony radio. Simply taking the back and front off it left us with the circuit board speakers and ariel. For power it is easier to buy a small battery box suitbale to hold two 1.5Volt batteries.
Step 3: Enhancing the Circuit Board
at this stage the circuit board should be fully detached from the original plastic casing. The next thing that should be done is attaching a micro switch between the battery box and the circuit to act as a switch when the coin hits it. when the coin hits the switch it will have to land in a bucket of some sorts so add a small shaped scoop onto the end on the micro controller switch for the coin to rest in.
When the coin lands on the scoop it will switch on the micro switch and in turn will complete the circuit and the radio will play.
Step 4: Creating the Base of the Radio
For cutting out the wood for the base of the radio cut out the measurements bellow (measurements are in mm)
2X (220x50) front and back
2X (107x50) sides
2X (207x107) top and bottom
in one of the 220x50 cut out a rectangle (97x38) on the left hand side. this will now be the front
on one of the (207x107) cut 2 circles 6mm and 30 mm apart and create a slit on the left hand side of the wood big enough for a coin to fit through. This will now be the top
Step 5: Cut Plastic
for the plastic on the top cut out. use clear acrylic plastic but the thickness does not matter. Mine was 5mm
3X (220x180) front middle and back
4X (220x5) sides
4x (120x5) slats for coin to roll down
1 x (150x 5) for the top between front and middle.
I used a laser cutter to cut out the shapes as it gave a smooth edge and precise cut but a band saw works just as well.
Step 6: Cutting the Grill for the Front
For the grill for the front of the radio cut a piece of thin plywood (100x 40) and cut holes into it as well for the sound to exit.
I cut mine on the laser cutter for a precise finish.
insert as many holes as you wish and what ever shapes you wish.
this grill should now cover the hole created in the wooden box
Step 7: Glue Plastic
For this part of the process glue the 220x 5 onto the left hand side of the 220x180 the other 220x5 onto the right. as an extra cut out a small semi circle in the top of the 220x5.
do the same again bar cutting the semi circle
then glue the two together. then on the front add the four 120 x 5 at angle so that the coin can roll down.
Add the 150x5 to the top. then finish of by potting the last 220x180 on top to enclose it all.
Step 8: Creating the Box
gluing the wooden box together. Glue the top front and back and the right side at this stage.
the other side will have to be left off till you fit a handle and the bottom cant be fitted till the circuit board is added to it.
Step 9: Smoothing the Plastic
using a flame i melted the plastic down on the edges to smooth off the edges.
Step 10: Attaching the Plastic to the Wood
glue the two together so that they fit securely and make sure the coin will drop down the hole.
Step 11: Attach the Circuit Board
attach the circuit board to the to the top of the bottom piece of wood and slide up. attach 2 rods coming up from the volume and the tuning to act as dial.
Step 12: Finishing Off
add any dials you wish and create a lever for the side to open so you can remove the coin in turn turning the radio off.
Step 13: Final Outcome
Radio should now be complete