PROJECTS: TOY MUSIC SEQUENCER

makezine.com/13/sequencer

5. FIT THE ELECTRONICS AND FINISH THE WIRING

5a. Center the PCB in the bottom of the box. Mark and drill mounting holes for it in the bottom panel, but don’t mount it yet. You can also drill the board itself, but I positioned the holes so that 4 screws would hold it at the edges. Position the battery holder clip and speaker next to the PCB, then mark and drill mounting holes for those.

5b. Solder the red wire from the battery holder onto one side of the on/off switch. Solder a free wire onto the other side of the switch. Glue the switch into its hole, and clip in the battery holder.

5c. Connect wires from the speaker, battery holder, and on/off switch to the screw terminals on the PCB (refer to TB1 and TB7 on the wiring diagram).

5d. Screw the lid back onto its hinges. Follow the wiring diagram and split the loom into 3 parts, routing connections to each terminal row. Work your way around the board, trimming, stripping, and terminating all the wires. Use additional cable ties to keep things neat. Note that for the LEDs’ positive connections and the peg switches, 2 wires go into each screw terminal.

5e. Have a good look at your wiring to confirm that everything is in place, then mount the circuit board with the screws and load 3 AA batteries into the holder.

6. PROGRAM THE MICROCONTROLLER AND TEST

Finish the project by programming the microcontroller and testing the sequencer, following the instructions at makezine.com/13/sequencer.

FINISH X

132 Make: Volume 13

NOW GO USE IT »