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Table of Contents
WIO Control
| Work In Progress |
The WIO Control is based on ESP32 Dev Module and LOLIN D32 boards.
Display
WIO Control needs a display for some of its functions:
- Status bar
- Locomotive selection
- Function selection
Programming
ESP32 Dev Module
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
Pinout
| ESP32 Dev Module | LOLIN D32 |
|---|---|
 |  |
Extended Layout
The board selection is selected in the Pins.h file.
#define ESP32_DEV_MODULE 0 #define ESP32_LOLIN_D32 1 #define WIO_BOARD ESP32_LOLIN_D32
| Preliminary |
|---|
Compared with the Lolin D1 Mini, the ESP32 has a lot more I/O Pins, so an extra F0 and Shift button are added.
ESP32 Dev Module
| GPIO | Function | Selection mode | Shift function | Long click | Long click + shift |
|---|---|---|---|---|---|
| 26 | Rotary V+ | Browse loco list down | - | - | |
| 25 | Rotary V- | Browse loco list up | - | - | |
| 36 | Rotary direction | Take over the selected loco from the list. | Alter between loco 1 and 2. | - | |
| 27 | F0 | - | - | Power off | Power on |
| 32 | F1 | - | F9 | F5 | F13 |
| 33 | F2 | - | F10 | F6 | F14 |
| 0 | F3 | - | F11 | F7 | F15 |
| 14 | F4 | - | F12 | F8 | F16 |
| 13 | Shift | - | - | - | |
| 16 | LED | - | - | - | |
| 35 | Battery (ADC) | - | - | - |
Voltage divider
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).
NoGo Pins
The following pins can not be used:
- GPIO06 - GPIO11 (Are in use by the Flash interface.)
- GPIO12 can only be used as output. If the pin is pulled up at boot time, the ESP32 won't boot.
ESP32 LOLIN D32
| GPIO | Function | Selection mode | Shift function | Long click | Long click + shift |
|---|---|---|---|---|---|
| 26 | Rotary V+ | Browse loco list down | - | - | |
| 25 | Rotary V- | Browse loco list up | - | - | |
| 34 | Rotary direction | Take over the selected loco from the list. | Alter between loco 1 and 2. | - | |
| 27 | F0 | - | - | Power off | Power on |
| 32 | F1 | - | F9 | F5 | F13 |
| 33 | F2 | - | F10 | F6 | F14 |
| 0 | F3 | - | F11 | F7 | F15 |
| 14 | F4 | - | F12 | F8 | F16 |
| 12 | Shift | - | - | - | |
| 5 | LED | - | - | - | |
| 35 | Battery (ADC) | - | - | - | |
| 21 | SDA | - | - | - | |
| 22 | SCL | - | - | - |
Voltage divider
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
I2C Display
The I2C SSD1306 compatible 128*64 display, must be connected to GPIO21(SDA) and GPIO22(SCL).
Short IDs
Use Transmit short IDs to load the locomotive short IDs into WIO Control.
Selecting a locomotive
- Press and release the shift button; On the bottom display line the first ID is shown.
- Turn the rotary until the wanted locomotive is selected.
- Push the rotary button to activate the selected locomotive.
Just press and release the shift again to cancel the selection procedure.
Hardware
A fitting case could be:
Schedule and PCB
| WIP |