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I2C: solenoid state (16-bit word)

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Teensy (master read)

SolenoidReceive performs Wire.requestFrom(slave, 2) and combines high/low bytes MSB first into uint16_t. The DAQ selects the mux channel first when SOLENOID_MUX_CHANNEL is not 0xFF (daqloop.cpp).

  • Address: SOLENOID_I2C_ADDR (default 0x09 in hwconfig.h).

Torito ESP (slave)

src/tsesp/main.cpp registers Wire as a slave at I2C_SLAVE_ADDR (0x09):

  • On receive (master write): expects 2 bytes; updates lastI2CValue and may call setRelays() if RELAY_MSB_BIT is set.
  • On request (master read): returns the same high / low byte pair.

End-to-end

Teensy reads the state the ESP last applied (LoRa or I2C write). Keep bit semantics aligned with relay bitmap and LoRa payloads.