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The generator needs a sketch flashed once. It receives the signal you have open in the editor and plays it on its outputs.
It does not connect to the internet, to a cloud, or to any server: the link is always point to point, over the USB cable.

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What you need

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Flashing it

1

Install the core

Arduino IDE → Boards Manager → esp32 by Espressif Systems.
2

Pick the board

ESP32 Dev Module, and the port it is plugged into.
3

Upload the sketch

Open oryx_signal_esp32.ino and upload. It needs no external libraries.
4

Close the serial monitor

Before connecting from the app: while it is open, the port is taken.
The serial monitor (115200) shows a greeting at boot.
The firmware code is also inside the app, in Device → ESP32 firmware, with a button to copy it.

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Outputs

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Voltage

In analog, the voltage scales directly what the DAC puts out, between 0 and 3.3 V. In digital, a pin knows nothing of intermediate levels: it outputs 3.3 V or 0. There the voltage value comes out on GPIO 25 as a steady reference voltage, meant to feed the external stage —divider, buffer or level shifter— that sets the real pulse height.
Without that external stage, the pins always output 3.3 V and the voltage setting changes nothing.

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Device limits

If your signal does not fit, the app tells you before sending it and explains what was adjusted.

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Cycles and step time

Both adjust the same thing from two sides:
  • With cycles at 0, the step time rules as it is.
  • With cycles above 0, one full pass of the signal is one engine revolution:
Changing either one restarts the pass in progress, so the change shows on the oscilloscope right away. The lap counter is not zeroed: that is what Restart is for.

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When the signal stops on its own

If the cable comes loose or you close the tab, the signal stops and the outputs go low. It is on purpose: the device cannot find out that nobody is on the other end, so if it goes a while without receiving orders it treats the link as finished.