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RC Robot Tutorial

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Alex B.
2025-07-21 02:52:20 -04:00
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ESP-IDF_Robot/tutorial/docs/source/overview.rst
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@@ -128,6 +128,19 @@ The following images illustrate various PWM duty cycles registered by oscillosco
Fusion of Software with Hardware
--------------------------------
On one hand, we have the hardware designed so that the joystic x- and y- axis, and DC motors are wired to the proper GPIOs on the
ESP32-C3 WROOM microcontroller. On the other hand, we have the software that reads the joystick x- and y- axis, sends the data
to the receiver device, and converts that to PWM values on the receiver device.
In essense, the direction and speed of the bitByte Rider car is controlled by the two variables. On the remote controller device,
the joystic x- and y- axis values are sent to the receiver device in a raw format (i.e. analog voltages, "as-is"). On the receover
device, these two values are converted to the two PWM values; one for each pair of DC motors on left and right side.
When jostick is in the forward position, the x-axis value is at 1.65V, whule y-axis value is at 3.3V. Conseuently, the receover on RC car
translates these values to PWM with a duty cycle of 100% on each side. Similarly, when the joystick is in left (or right position), the
receiver translates the x-axis value to PWM of 100% on the left side DC motors, and 0% on the right side DC motors (or, opposite for the
right positionof the joystick).
The table below summarizes the reserved GPIOs.
+------+-----+---------------------------------------------------------+----------------+