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Work In Progress |
The WIO Control is based on ESP32 Dev Module and LOLIN D32 boards.
WIO Control needs a display for some of its functions:
The Boot button must be pressed to be able to flash this module over USB.
This button is located right beneath the display.
The following error will show up in the Arduino IDE if this button is not pressed:
Connecting........_____....._____....._____....._____....._____....._____....._____....._____....._____....._____ A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
The ESP32 type board selection is set by WIO Dialog.
Preliminary |
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Compared with the ESP8266, the ESP32 has a lot more I/O Pins, so an extra F0 and Shift button are added.
GPIO Dev Module | GPIO Lolin D32 | Function | Selection mode | Shift function | Long click | Long click + shift |
---|---|---|---|---|---|---|
26 | 26 | Rotary V+ | Browse loco list down / Select function right | - | - | |
25 | 25 | Rotary V- | Browse loco list up / Select function left | - | - | |
34 | 34 | Rotary direction | Take over the selected loco from the list / Flip selected function | - | - | |
27 | 27 | F0 | - | Alter between loco 1 and 2 | Power off | Power on |
32 | 32 | F1 | - | F9 | F5 | F13 |
33 | 33 | F2 | - | F10 | F6 | F14 |
0 | 0 | F3 | - | F11 | F7 | F15 |
14 | 14 | F4 | - | F12 | F8 | F16 |
12 | 12 | Shift | - | - | Function selection mode | - |
16 | 5 | LED | - | - | - | - |
35 | 35 | Battery (ADC) | - | - | - | |
5 | 21 | SDA (Display) | - | - | - | - |
4 | 22 | SCL (Display) | - | - | - | - |
Note: Do not use a hardware pull-up resistor on GPIO12 because this will block uploading firmware by USB.
A voltage divider is needed to measure the Lipo(battery).
GPIO35 is connected to the Lipo + with 47k resistor, and with a 100k resistor to the ground(GND).
The following pins can not be used:
The LOLIN D32 has a build in divider on GPIO35: 100k/100k.
See: https://wiki.wemos.cc/_media/products:d32:sch_d32_v1.0.0.pdf
The I2C SSD1306 compatible 128*64 display, must be connected to GPIO21(SDA) and GPIO22(SCL).
Use Transmit short IDs to load the locomotive short IDs into WIO Control.
Just press and release the shift again to cancel the selection procedure.