A shock sensor for pre-season events logging to SD card. credit to the zebracorns: https://github.com/FRC900/2023RobotCode/blob/main/zebROS_ws/src/adafruit_adxl37x/src/Ada_the_fruit_on_the_acceleratormator.py

We Ported it over to pico 2040, added an SD Card writer, and some LED's. See circut diagram and case files to make and print.

The default startup is to light all lights (1-5), calculate a "Noise" threshold (2-3 lit), then wait for the first shock event (2,3,4 Lit). This allows you to sync up multiple units all to the same "time_sync_event". To sync them up: Put all the units on the same surface, wait till 2,3,4 are lit, then hit the surface with a hammer. they should all go red (1) then green (5)

LED Statuses: 1 blinking fast for 10 seconds: Something wrong with SD Card. all LED on: stuck in boot. 2&3 lit: Calculating Noise threshold 2,3,4 Lit: Waiting for First event 4 lit: Waiting for shock 1 single blink less than 2 seconds : Writing to SD card

Running on Adafruit CircuitPython 9.1.3 Install from: https://circuitpython.org/board/raspberry_pi_pico/ Install adafruit_adxl34x.mpy and adafruit_adxl37x.mpy from the adafruit-circutpython-bundle-9.x into the lib folder of the Pico over USB. Copy code.py over to the Pico USB drive.

Wire up according to the Impact Sensor.fzz (.png also provided).

Parts List: SD Card: https://amzn.to/4gctrdu SD Card Reader: https://amzn.to/3XgmkZ3 LED: https://amzn.to/3My8YCd ~200 Ohm Resistors: https://amzn.to/3AOs7gT Pico 2040: https://www.adafruit.com/product/4864 ADXL375 Sensor: https://www.adafruit.com/product/5374

Assume that you also have wire, solder, etc..

3D printable case file supplied as well here as a .3mf file and fusion 360 source. You'll need M2 and M3 screws for the case.

Video of it in testing: https://youtu.be/Hgpz41B1Njg

Hopefully we can get some crash data from all your robots!