Quick start

You supply a CRTP adapter that inherits fdo2::UartInterface<YourType> and implements three calls: write, read, flush_rx. Optional delay_ms_impl helps with boot delays.

1. Wire and baud

  • Default UART after sensor power-up: 19200, 8N1, no handshake (data sheet §4).
  • Allow ~1 s after power-up before the first command (kFdo2G2PowerUpSettleMs).

2. Minimal adapter (sketch) 

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#include "fdo2.hpp"

struct MyUart : fdo2::UartInterface<MyUart> {
  void write(const uint8_t* d, size_t n);
  size_t read(uint8_t* o, size_t m, uint32_t timeout_ms);
  void flush_rx();
};

3. First measurements 

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MyUart uart;
fdo2::Driver<MyUart> dev(uart);
dev.SetMeasureTimeoutMs(300);

auto v = dev.ReadVersion();          // #VERS D N R S
auto m = dev.MeasureMoxy();          // fastest: #MOXY O T S
// or: auto r = dev.MeasureMraw();   // adds pressure, RH, dphi, intensities

Decode fields are ready in MoxyReading / MrawReading (p_o2_hpa, temp_c, status_u32, …). Use fdo2::MoxyStatusOkForOxygen(s) to assert S ≤ 1 as recommended in the data sheet.

4. Volume % O₂

When membrane pressure matches the vent-side pressure from #MRAW P, use VolumePercentO2(p_o2_hpa, pressure_mbar) (see UART protocol).

Next: UART protocol →