Steampunk Grenade

thingiverse

This is a remix of Reg Taylor's wonderful Steampunk Grenade (https://www.myminifactory.com/object/3d-print-steampunk-grenade-3280). I took Reg's suggestion and added some lights and sounds. Here is a list of parts that I purchased for this project: 10mm Green LED (https://smile.amazon.com/Diffused-Green-10mm-LED-pack/dp/B076L2C8VF) 5V Piezo Buzzer (https://smile.amazon.com/gp/product/B07GJSP68S) Arduino Nano (https://smile.amazon.com/gp/product/B00SGMEH7G) Adafruit 3.7V 400mAh Lithium battery (https://www.adafruit.com/product/3898) JST PH 2-Pin Cable (https://www.adafruit.com/product/3814) I also picked up an Adafruit Micro-Lipo Charger for the battery (https://www.adafruit.com/product/1904) All the wire is 24 AWG stranded (https://smile.amazon.com/gp/product/B07DCV7BDD) SWITCH BLOCK To assemble the switch block, start by soldering short pieces of wire, about 2 inches long each, to the piezo buzzer. Insert the piezo buzzer into the holder on the back of the switch block. Crimp a female JST pin to the positive wire and strip about 1/8 inch off the ground wire. Next you will need two positive and one negative AAA battery terminal. Clip the tab off one of the positive battery terminals then solder a piece of wire about 3 inches long to the negative terminal. Bend the tab on the negative terminal 90 degrees up toward the spring. Insert the wire and negative terminal into the switch block as shown, making sure the spring seats on the nub at the bottom of the space in the switch block. Next take the positive terminal with the tab cut off and lay it on top of the negative terminal with the nub pointing up. Finally, cut the red wire from the JST PH 2-Pin cable to a length of about 4 inches and solder it to the remaining positive terminal. Insert the wire and terminal tab through the slot at the back of the switch block just above the piezo buzzer. Push the terminal down until it is even with the slot in the front of the switch block and slide it forward into the slot. LED Solder two pieces of wire, about 2 inches long each, to the LED. Crimp a female JST pin to the positive wire and strip about 1/8 inch off the ground wire. Arduino Board Insert the red wire from the switch block and the ground wire into one 2-pin JST housing. Insert the positive wire from the piezo buzzer and the positive wire from the LED into another 2-pin JST housing. Connect the 2-pin JST connectors to the correct pin headers as shown. Plug in the battery and the LED should blink and the piezo buzzer should buzz. Insert the pin to 'turn off' the system. Paint the various pieces as you see fit. Glue the 'Tubes' to the 'inner-part-1' piece. Glue the 'Cage-par-4' piece to the 'inner-part-1' piece. Glue the 'detonator' to the 'Timer' making sure the holes are aligned correctly. FINAL TESTING Pull the pin and the LED should blink and the piezo buzzer should buzz at an increasing rate for about 12 seconds ending with a long buzz (https://youtu.be/_jNPchdFCa4).