For this year’s Trunk ‘O’ Treat game I wanted to make a something fun and exciting for kids to play so I choose a Whac- a-Mole type game called Whac-a-Veggie using the Veggie Tales characters.
The Whac-a-Veggie game is played with a foam hammer in your hand and the veggie characters randomly popping-up quickly and you have to hit them on the head before they go back in there holes to score a hit, the one with the most hits wins. The PIC microcontroller controls the game action with air cylinders that push the veggies up and down by the use of an air solenoid. A timer keeps the game time to 35 seconds long and the score board counts the number of veggies you hit in the game.
Step 1: Design and Operation
The Whac a Veggie game has to maintain the following list of game requirements for reliability and game operation. The game starts off by clearing the score for a new game and keeping score during the game with every hit. Start a timer for a preset game time and the timer stop the game when the time is expired. The veggies need to pop-up randomly during the game. The veggies must not rotate when hit so we have to design the hardware to keep the veggies looking forward at all times. The game must me made strong enough to take the many hard hits with the hammer. The relay, air cylinders, and solenoids need to move the veggies up and down quickly to have good game to player response for game fun.
PIC 18F4550 PIC
40 Pin PIC Development Board # DEV-00021 (Spark Fun)
ATX breaker board #BOB-09558 and ATX connector #PRT-09498 (spark fun)
Bimba Air cylinder 6” travel #BF-096-D
MettleAir pneumatic valves 5/2 way 4A210-08 12VDC (Pneumatic Products)
Brass air Silencer for exhaust air 1/8” (Pneumatic Products)
Tubes thread fittings 1/4” #S1/4-N02 (poweraire.com)
Tube male elbow fittings 1/4” #E1/4-N02 (poweraire.com)
Union straight speed controller #USC1/4 (Qty-6) (poweraire.com)
Triple branch union #TUBU1/4(Qty-2) (poweraire.com)
20MHZ crystal oscillator
Timer MX024 Digital Timer (Bakatronics)
Relay module board, eight channels, for PIC, songle electronics (eBay)
ATX breakout board and connector # BOB-09558 and PRT-09498.
Resistors: 1K, 100, 10K, 470 ohm,
Capacitors 4.7uf, .1uF
Counter Display #G16774 (goldmine electronics)
ATX power supply connector 12v, 5v power for control and lights.
Blank PCB proto boards
74LS08 AND gate
Mechanical hardware springs, 6-32 bolts, 1/4”-20 bolts, 8-32 bolts,