PROFERIS - Mi³osz Stocki
90 lines
3.1 KiB
Markdown
90 lines
3.1 KiB
Markdown
# WijiBoard Wiring Diagram
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This document outlines the hardware connections for the WijiBoard.
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## Hardware Components
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- **Microcontroller**: Waveshare ESP32-S3-Zero
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- **Motors**: 2× 28BYJ-48 (5V Stepper Motors)
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- **Motor Drivers**: 2× ULN2003 Driver Boards
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- **Power System**:
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- 4S LiPo Battery
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- XH-M609 Battery Low-Voltage Disconnect Module
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- 2× Buck Regulators (step-down converters tuned to 5V)
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---
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## Power Connections
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The system is powered by a 4S LiPo battery. To protect the battery from over-discharge, it is connected to an **XH-M609** module. The output of the XH-M609 is split into two separate **Buck Regulators**, both tuned to output 5V.
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1. **Buck Regulator 1 (MCU Power)**: Dedicated to powering the ESP32-S3-Zero.
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2. **Buck Regulator 2 (Motor Power)**: Dedicated to powering both ULN2003 driver boards to prevent voltage drops or electrical noise from affecting the MCU.
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> [!IMPORTANT]
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> **Common Ground**: You MUST connect the Ground (GND) from the ESP32 to the Ground (GND) of the ULN2003 drivers. Even though they have separate 5V power supplies, they need a common ground reference for the GPIO logic signals to work correctly.
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| Component | Connection | Destination |
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| :--- | :--- | :--- |
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| **4S LiPo** | `BAT+` / `BAT-` | XH-M609 `VIN+` / `VIN-` |
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| **XH-M609** | `VOUT+` / `VOUT-` | Split to **IN+** and **IN-** on both Buck Regulators |
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| **Buck 1 (MCU)** | `OUT+ (5V)` | ESP32-S3-Zero `5V` (used as power input) |
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| **Buck 1 (MCU)** | `OUT- (GND)` | ESP32-S3-Zero `GND` |
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| **Buck 2 (Motors)**| `OUT+ (5V)` | ULN2003 (M1) `+ / 5V` and ULN2003 (M2) `+ / 5V` |
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| **Buck 2 (Motors)**| `OUT- (GND)` | ULN2003 (M1) `- / GND` and ULN2003 (M2) `- / GND` |
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| **ESP32-S3-Zero** | `GND` | Tie to the motor ground network (Common Ground) |
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---
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## Motor 1 (Right Motor) Logic
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**Physical Location**: Right side (pivot at +12.9mm)
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| ESP32-S3-Zero Pin | ULN2003 (Motor 1) Pin |
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| :--- | :--- |
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| **GPIO 4** | `IN1` |
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| **GPIO 5** | `IN2` |
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| **GPIO 6** | `IN3` |
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| **GPIO 7** | `IN4` |
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---
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## Motor 2 (Left Motor) Logic
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**Physical Location**: Left side (pivot at -12.9mm)
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| ESP32-S3-Zero Pin | ULN2003 (Motor 2) Pin |
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| :--- | :--- |
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| **GPIO 8** | `IN1` |
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| **GPIO 9** | `IN2` |
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| **GPIO 10** | `IN3` |
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| **GPIO 11** | `IN4` |
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---
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## Stepper to Driver Connections
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Simply plug the white 5-pin JST connectors from the 28BYJ-48 motors into the corresponding white sockets on their respective ULN2003 driver boards. The connector is keyed and only fits one way.
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## Schematic Overview
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```mermaid
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flowchart LR
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subgraph Power Delivery
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BATT[4S LiPo Battery] -->|14.8V| XHM609[XH-M609 Protector]
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XHM609 -->|14.8V| BUCK1[Buck Regulator 1]
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XHM609 -->|14.8V| BUCK2[Buck Regulator 2]
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end
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BUCK1 -->|5V Power| ESP[ESP32-S3-Zero]
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BUCK2 -->|5V Power| M1_Driver[ULN2003 M1]
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BUCK2 -->|5V Power| M2_Driver[ULN2003 M2]
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%% Common Ground
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ESP -. Common Ground .- M1_Driver
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ESP -. Common Ground .- M2_Driver
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%% Logic Signals
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ESP -- Pins 4,5,6,7 --> M1_Driver
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ESP -- Pins 8,9,10,11 --> M2_Driver
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%% Motors
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M1_Driver == 5-wire cable ==> M1[Motor 1 - Right]
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M2_Driver == 5-wire cable ==> M2[Motor 2 - Left]
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```
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