Digitise an older engine - ESP32

[Techstyle]

". . . . unless you have a sensor connected". Not completely accurate perhaps, but I think I understand now the situation.

Oops . . . .  it is not a "I2C" connection but a oneWire connection, of course!

with regard to 1-wire, the first statement is correct.  if you look in "onewire_temperature.h" (refereneced at the top of the Main.cpp) you will find:

Code:

class OneWireTemperature : public FloatSensor {
public:
  OneWireTemperature(DallasTemperatureSensors* dts, uint read_delay = 1000,
                     String config_path="");
  void start() override final;
  virtual void get_configuration(JsonObject& doc) override final;
  virtual bool set_configuration(const JsonObject& config) override final;
  virtual String get_config_schema() override;

private:
  DallasTemperatureSensors* dts_;
  uint conversion_delay_ = DSTherm::MAX_CONV_TIME;
  uint read_delay_;
  bool found_ = true;
  OWDevAddr address_ = {};
  void update();
  void read_value();
};

if found_ = false then it does not read and update the value, so no sentence sent to SignalK