How awesome it would be if you can build something that helps you train in fencing and have fun at the same time, right!?,
My name is Enrique Alvarez, I am the fencing master for the Fargo-Moorhead Fencing Club and I was tired of seeing my students playing video games in tournaments and not paying attention to what they should have been paying attention, ;) I had the idea to bring the electronic world and fencing together and have some fun with it, I am sure everybody is familiarized with electronic targets, devices that usually contain a set of lights and pressure sensors that determine which region of the target is being hit, very similar to the electronic memory game of Simon. I wanted to bring this idea to the next level, and that’s why I created the MMFT (multi modal electronic target).

Step 1: Cut Play-wood and Place the Targets

First step is to get the plywood cut and drilled,
I got half an inch Birch plywood and cut it 18 by 20 inches approximately
then I drilled 7 holes destined for the seven targets/push-buttons from All Electronics and finally placed them in the positions shown in the picture.

Step 2: Prep the Lights

The push-button from All Electronics come with the regular white bulb,
what I did, was to switch those bulbs for RGB leds, driven by an Arduino Mega
I also added some resistors to control the current sent to the LEDs.

Step 3: Prepare the Arduino

The Arduino Mega is limited in current output, so I included a set of n-channel Mosfets to beef up the power to the leds.

Step 4: Display Board

The Electronic Fencing Target includes a 4 digit display to show the fencer the results of the exercises and any other info messages.
The 4 digit display uses an SPI interface with the micro-controller, messages with the data to display are sent through the SPI link and received by the sub-system. More details are explained in the code section.

Step 5: Wrie It Up!

Now, you just have to wire the output from the N-channel Mosfets to the RGB leds and the push-button inputs,
in this particular model, there are:

- 7 outputs for the red leds,
- 7 outputs for the green leds,
- 7 inputs for the push-buttons.

The eagle schematic is also shown in the images files and the schematic in Eagle cadsoft is included.

targetFencingLED.sch
Download

Step 6: Wireless Module

The wireless module is composed of:

- 1 Arduino nano

- 1 link pair of nRF24L01+
- 1 cell phone micro motor

The submodule is based on the nRF24L01+, more info->

https://www.deviceplus.com/arduino/nrf24l01-rf-mod...

https://howtomechatronics.com/tutorials/arduino/ar...

https://learn.sparkfun.com/tutorials/nrf24l01-tran...

The wireless module receives messages form the Arduino Mega an when needed activates the micro motor to provide vibration in along the blade.The module is attached to the weapon with a couple of Neodymium magnets.