Standard Target Panels

It seems it has been a while since the topic of the stand target panels has been discussed. Is this repository GitHub - bloftin/rbots: RTEAM Robotics Club repository still the best place to get details about the current target panels? I seem to remember the size as 3" by 3" but this states they are 3.5" by 3.5"… Can someone help me understand what the latest specs are?

My goal is to build a system that can use an Arduino Nano 33 IoT [ABX00027] instead of an XBEE for scoring system communications.

All the best,
jimfinoc

As far as I understand it, the target plates used at the 2019 BAMF are still the ones.
They are 3.5"x3.5".

For competition, the official plates supplied by R-Team will be used, to make for “fair standardization” but you can make your own stand-ins if you want to practice.

Integrating the wiring in the bot (running three 4-wire SPOX cables between the back and each panel location) is something I would highly recommend. Also, leave yourself a couple of inches of slack for connecting – I left some but not much, and getting enough articlation/force with my fingers to shove them into the socket was a PITA.

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Thanks! It has been too long since I was able to compete with you guys. I’m hoping to build a wifi based scoring system so I can use it at West Point for practice with the cadets. I appreciate RTeam handling the scoring for us “competitors” but always good to have a set of your own.

I remember at one time talking about getting the panel data into the mech so a pilot could determine which direction the scoring hit was coming from. Any ideas if that was implemented?

I think the existing system uses the same mechanism as the old panels – a signal wire that’s low for 50 ms for panel 1, 100 ms for panel 2, 150 ms and 200 ms for panels 3 and 4. There was talk of maybe also making a 9600 bps softserial output (which really would be pretty simple to generate,) but I don’t think that’s implemented yet.

FWIW, I prototyped my own piezo panel detector, using acetal hit panel and a glued-on piezo buzzer as detector, and it worked fine! Get the right resistor for dissipating the hit power, and a zener to avoid over-triggering, and you can detect it as a pin change interrupt directly in a microcontroller, very little conditioning needed. If you want to make it fancy, use a trim pot and a comparator or opamp, to totally de-couple the MCU.

Can you tell me what piezo sensors you used? That is one thing I’m having a hard time finding in the BOM in the RTeam git repository.

I decided on going with a 20mm disk type I found on amazon.

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwig9Mbi_-_vAhWgFVkFHYL9BVAQFjAAegQIAxAD&url=https%3A%2F%2Fwww.amazon.com%2F15Pcs-Trigger-Acoustic-Pickup-Guitar%2Fdp%2FB07B8RJ8NX&usg=AOvVaw3UMk4-DFLzFmTpoYK0bLyp

If it works as expected, I’ll document it here.

I just used something out of the parts bin :slight_smile: They are all pretty much the same – a piece of crystal with wires and a bit of tin attached to them to transduce the noise, IIRC.
One main challenge is making sure you don’t blow your MCU when it gets a surprisingly-sharp shock – they can easily generate 30+ Volts when the conditions are right. A Zener/TVS and a resistor ladder is recommended.