Coin Sorter

Accumulated all your coins in one place and want to separate them accordingly? Then make yourself this coin sorter with a Micro:bit!


You'll need

Lots and lots of cardboard and some superglue Jumper wires (min 4) 3 x Crocodile clip heads 1 x Soldering Kit (Solder and Soldering Iron) 1 x Battery holder w/ 2 AAA Batteries 1 x Micro:bit 1 x Ultrasound HC SR04

Step 1

Instructions

Cut out a 5x25 cm piece of cardboard and draw a line 0.5 cm from the long side of the cardboard and a line 5 cm from the short side. Then put a 5 cent coin at the corner of the two lines and mark out the edge (as shown in the picture).




Materials

Cardboard 1 x Penknife 1 x 5 cent coin


Step 2

Instructions

Draw a rectangle with a length the same as the diameter of the coin and width 0.2cm shorter than the diameter of the coin. Then shade the rectangle to mark that it's to be cut out later.




Materials


Step 3

Instructions

Leave 2cm from the rectangle and draw another line. Repeat steps 1 and 2 but for 10 cent, 20 cent, 50 cent and 1 dollar coins in order of size (from smallest to largest).




Materials


Step 4

Instructions

Cut out the shaded rectangles with a penknife. After cutting, you notice the cardboard is most likely a little flattened around the rectangles, go ahead and flatten the rest of the cardboard.




Materials


Step 5

Instructions

The cardboard may be to rough for the coins to slide down, tape it over with smooth scotch tape to make it smoother. (The clear scotch tape may not work as well)




Materials


Step 6

Instructions

Cut out 2 2.5x25 cm pieces of cardboard and stick them on the two long sides of the first piece you made.




Materials


Step 7

Instructions

Cut out a 19x26 cm piece of cardboard and draw a reference line 5.5 cm away from the right short side. Then draw a 4.5x2.2 cm rectangle behind the line and cut it out. (Use the picture for reference)




Materials


Step 8

Instructions

Draw a 5x18 cm rectangle to the left of the reference line and cut the short sides. Then press the long side with a ruler to make it easier to bend. (Refer to the picture) This flap will act as a door to your sorted coins.




Materials


Step 9

Instructions

Your cardboard should look like this after step 7 and 8.




Materials


Step 10

Instructions

Cut a 5x19 cm piece of cardboard. Draw a 0.3x3 cm rectangle 16 cm from the bottom and a 1x2 cm rectangle 10 cm from the bottom. (Refer to the picture if needed)




Materials


Step 11

Instructions

Expose one side of the F-F Jumper wire and solder that to the exposed side of the Crocodile Clip wire.




Materials

1 x F-F Jumper Wire 1 x Crocodile Clip Head 1 x Soldering Kit


Step 12

Instructions

Insulate the exposed soldered wire with either electrical tape or shrink tubing. Repeat the these two steps two more times, but for the second wire, use a black Jumper Wire and Crocodile Clip Head.




Materials


Step 13

Instructions

Connect the three Crocodile Clips onto the Micro:bit as shown in the picture.




Materials


Step 14

Instructions

Paste the HC SR04 Ultrasound sensor on a 2x5 cm piece of cardboard. Make sure the Ultrasound sensor is flushed to the piece and that the wires are sticking out. Then connect the signal and echo pins of the sensor onto pin 0 and 1 of the Micro:bit and the ground pin of the sensor to the ground pin of the Micro:bit.




Materials


Step 15

Instructions

Cut another 5x25 cm piece of cardboard and copy the vertical reference lines of the piece with the holes onto it. Then cut out 6 5x5 cm pieces and stick them on the lines.




Materials


Code and References

Completed this tutorial?

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