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Safety Notes

  • Teensy 4.1 is 3.3 V-only (GPIOs are not 5 V tolerant). If DAQ DO lines are 5 V, use level shifters or opto-isolators (open-collector + pull-ups to 3.3 V).
  • Flyback protection: TPIC6B595 drives inductive loads (valves). Keep TPIC SR outputs with proper transient suppression per datasheet (integrated diodes help, but add bulk capacitance near loads).
  • Grounding: DAQ GND, Teensy GND, and TPIC logic GND must share a stable reference. Avoid ground loops across long runs; star topology recommended.
  • Power rails: Size 24 V supply for worst-case concurrent valves + headroom. Add bulk caps near manifolds.
  • EMI: Route RCK and S-lines away from noisy solenoid conductors. Use twisted pairs and shielding where feasible.