we are going to transform a old zapper gun, into a T-Rex Game controller or "Google Meet" quit button. Not this only but you can perform any other action by changing the shortcut-key. Now let’s see how to transform it.
Step 1: Required Components and Software
Old Zapper Gun
Raspberry Pi Pico with Soldered male Headers
Micro USB Cable
Male to Female Jumper Wire x5
330 Ohm Resistor x1
LED x1
Buzzer x1
Screw Driver
Soldering Iron
Solder Wire
Step 2: Unscrew the Zapper Gun Using Screw Driver
Step 3: After Unscrewing Open This Zapper Gun
Step 4: After Open the Zapper Gun Now It Will Look Something Like This
Step 5: Necessary Parts From the Zapper Gun
From this Zapper Gun, here we need only the trigger push button, trigger clip with the zapper gun case. For more clarification you can refer to the above images.
Step 6: Now Take Out the Push Button From the Gun.
Step 7: Solder the Three, Male to Female Jumper Wire to the Three Pins of the Push Button.
Here we are soldering the female wires so that in the further steps we can connect them to the
male header of the pi pico.
Step 8: Now Solder the Buzzer, Led and Resistor With Each Other See the Below Images for the Circuit Diagram
Step 9: Solder the Male to Female Jumper Wire to the Buzzer - LED Circuit
Now solder the one male to female jumper wire to the common anode pin of the buzzer and led and another male to female jumper wire to the common cathode pin of the buzzer and led.
Step 10: Microcontroller
For Controlling the T-Rex Game OR performing any other action, here we are using the Pi Pico Microcontroller with the Soldered male Headers
Step 11: Interfaced the Buzzer, Led and Trigger Push Button to the Pi Pico
Long leg of LED & Buzzer → GP15 (Pico)
Short Leg of Led & Buzzer→ GND (Pico)
Brown Wire Pin of trigger push button → GND (Pico)
Yellow Wire Pin of trigger push button →GP27 (Pico)
Red Wire Pin of trigger push button → VBUS (Pico)
Step 12: IDE (Integrated Development Environment) for Programming the Pi Pico
Step 13: Install the Circuit Python Firmware Into Pi Pico
Download the Circuit Python UF2 file using this link
Push and hold the BOOTSEL button and plug your Pico into the USB port of your computer. Release the BOOTSEL button after your Pico is connected.
Step 14: Pi Pico Will Mount As a Mass Storage Device Called RPI-RP2 in Your Computer
Step 15: Reboot Your Pi Pico for the Circuit Python
Drag and drop the Circuit Python UF2 file onto the RPI-RP2 volume. Your Pico will reboot. You are now running Circuit Python.
Step 16: Add the Adafruit Circuit Python Hid Library
add the adafruit circuitpython_hid library for adding the keyboard and mouse capabilities in to the pi pico.
Download the library by clicking this link
Paste this lib folder into the Pi Pico Volume
Step 17: Open the Thonny IDE. and Choose the Circuit Python Port
Step 18: Code
Write the below code and save the file with the name of code.py. (If you are saving the file with some another name then in that condition you will have to upload the code each time when you plugged the pi pico.)
###################################################################################
import time
import usb_hid
import board
from digitalio import DigitalInOut, Direction, Pull
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keycode import Keycode
keyboard=Keyboard(usb_hid.devices)
btn1_Pin = board.GP27
led1_pin = board.GP15
btn1 = DigitalInOut(btn1_Pin)
btn1.direction = Direction.INPUT
btn1.pull = Pull.UP
led1 = DigitalInOut(led1_pin)
led1.direction = Direction.OUTPUT
while True:
if btn1.value:
led1.value = True
keyboard.press(0x2C)
else:
led1.value = False
keyboard.release(0x2C)
#######################################################################################
Step 19: Run the Code by Clicking on Run Button at the Top
Step 20: Check That All Is Working Fine Before Placing the Hardware Inside the Gun
Step 21: After Testing, Unplug the Pi Pico From Your Computer
Step 22: Attach All of That Interfaced Hardware Inside the Gun and Screwed the Gun
Step 23: Plug the Pi Pico to Your Computer & Enjoy Your Zapper Gun for Your Desired Action.
Step 24: Want to Perform Some Another Using the Gun
If you want to perform some another action using the same gun then in the line no. 18 & 21 just change the shortcut key according to your desired action & run the code again that’s it.
Click on this link to see the key code of any keyboard key.
Thank You. If you have any question regarding anything don’t hesitate to ask. And don’t forget to share your work also.
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