197 lines
6.4 KiB
Plaintext
197 lines
6.4 KiB
Plaintext
===============================================================================
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KICAD SCHEMATIC CONNECTION LIST - Midea AC Controller with BLE Beacon
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===============================================================================
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COMPONENT REFERENCE DESIGNATORS:
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- U1: AMS1117-3.3 (Voltage Regulator)
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- U2: ESP32-WROOM-32E (Main MCU)
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- U3: TXB0104PWR (Logic Level Shifter)
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- U4: CP2102N (USB-to-Serial, Optional)
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- USB1: USB Micro-B (Power Input)
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- USB2: USB Micro-B (Programming, Optional)
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- J1: JST-XH 4-pin (Midea AC Connector)
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- LED1: WiFi Status LED
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- LED2: BLE Status LED
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- SW1: Reset Button
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- SW2: Boot Button
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- R1-R4: Resistors
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- C1-C10: Capacitors
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===============================================================================
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POWER SUPPLY SECTION
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===============================================================================
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USB1 (Micro-B Connector):
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Pin 1 (VCC) → C1+ → U1.IN
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Pin 1 (VCC) → C3+ → U1.IN
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Pin 4 (GND) → GND
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U1 (AMS1117-3.3):
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IN → USB1.VCC (via C1, C3)
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GND → GND
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OUT → C2+ → 3V3_POWER_RAIL
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OUT → C4+ → 3V3_POWER_RAIL
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Power Rails:
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3V3_POWER_RAIL → U2.VDD (all VDD pins)
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3V3_POWER_RAIL → U3.VCCA
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3V3_POWER_RAIL → R1 (LED1 pull-up)
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3V3_POWER_RAIL → R2 (LED2 pull-up)
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3V3_POWER_RAIL → R3 (Reset pull-up)
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3V3_POWER_RAIL → R4 (Boot pull-up)
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3V3_POWER_RAIL → U4.VDD (if USB-to-Serial included)
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5V_POWER_RAIL → U3.VCCB (Level shifter high voltage side)
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5V_POWER_RAIL → J1.Pin1 (if AC dongle needs power)
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GND → Common ground (all GND pins connected)
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===============================================================================
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ESP32-WROOM-32E CONNECTIONS
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===============================================================================
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U2 (ESP32-WROOM-32E):
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VDD Pins (1,3,14,21,22,27,28,33,42) → 3V3_POWER_RAIL
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→ Each pin should have 100nF decoupling cap (C5-C13) to GND
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GND Pins (2,4,13,15,20,23,26,29,34,38,40) → GND
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GPIO17 (TX) → U3.A1 (Level Shifter LV1)
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GPIO16 (RX) → U3.A2 (Level Shifter LV2)
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GPIO2 → R1 → LED1.ANODE (WiFi Status LED)
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GPIO4 → R2 → LED2.ANODE (BLE Status LED)
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GPIO0 → SW2.Pin1 (Boot Button)
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GPIO0 → R4 → 3V3_POWER_RAIL (Pull-up)
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SW2.Pin2 → GND
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EN → SW1.Pin1 (Reset Button)
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EN → R3 → 3V3_POWER_RAIL (Pull-up)
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SW1.Pin2 → GND
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GPIO1 (TX) → U4.RXD (if USB-to-Serial included)
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GPIO3 (RX) → U4.TXD (if USB-to-Serial included)
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Decoupling Capacitors:
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C5 → U2.VDD_Pin1 → GND (100nF)
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C6 → U2.VDD_Pin3 → GND (100nF)
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C7 → U2.VDD_Pin14 → GND (100nF)
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C8 → U2.VDD_Pin21 → GND (100nF)
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C9 → U2.VDD_Pin22 → GND (100nF)
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C10 → U2.VDD_Pin27 → GND (100nF)
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(Add more as needed for other VDD pins)
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===============================================================================
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LOGIC LEVEL SHIFTER (TXB0104PWR)
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===============================================================================
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U3 (TXB0104PWR - TSSOP-14):
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Pin 1 (A1) → U2.GPIO17 (ESP32 TX - Low Voltage)
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Pin 2 (A2) → U2.GPIO16 (ESP32 RX - Low Voltage)
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Pin 3 (A3) → NC (Not Connected)
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Pin 4 (A4) → NC (Not Connected)
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Pin 5 (GND) → GND
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Pin 6 (B4) → NC (Not Connected)
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Pin 7 (B3) → NC (Not Connected)
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Pin 8 (B2) → J1.Pin3 (AC Dongle TX - High Voltage)
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Pin 9 (B1) → J1.Pin2 (AC Dongle RX - High Voltage)
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Pin 10 (OE) → 3V3_POWER_RAIL (Output Enable - Always High)
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Pin 11 (VCCB) → 5V_POWER_RAIL (High Voltage Side Power)
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Pin 12 (VCCA) → 3V3_POWER_RAIL (Low Voltage Side Power)
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Pin 13 (GND) → GND
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Pin 14 (GND) → GND
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===============================================================================
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MIDEA AC CONNECTOR
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===============================================================================
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J1 (JST-XH 4-pin or USB Type-A Female):
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Pin 1 (VCC) → 5V_POWER_RAIL (if AC dongle needs power)
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Pin 2 (RX) → U3.B1 (Level Shifter HV1)
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Pin 3 (TX) → U3.B2 (Level Shifter HV2)
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Pin 4 (GND) → GND
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===============================================================================
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USB-TO-SERIAL (OPTIONAL - FOR PROGRAMMING)
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===============================================================================
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U4 (CP2102N - QFN-24):
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VDD → 3V3_POWER_RAIL
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GND → GND
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DTR → U2.GPIO0 (Auto-reset for flashing)
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RXD → U2.GPIO1 (ESP32 TX)
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TXD → U2.GPIO3 (ESP32 RX)
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VBUS → USB2.VCC (5V detection)
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D+ → USB2.D+
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D- → USB2.D-
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USB2 (Micro-B Connector):
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VCC → U4.VBUS
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D+ → U4.D+
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D- → U4.D-
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GND → GND
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===============================================================================
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STATUS LEDs
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===============================================================================
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LED1 (WiFi Status - GPIO2):
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ANODE → R1 → U2.GPIO2
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CATHODE → GND
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(R1 = 220Ω for ~15mA current)
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LED2 (BLE Status - GPIO4):
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ANODE → R2 → U2.GPIO4
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CATHODE → GND
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(R2 = 220Ω for ~15mA current)
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===============================================================================
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BUTTONS
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===============================================================================
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SW1 (Reset Button):
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Pin 1 → U2.EN
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Pin 2 → GND
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(R3 = 10kΩ pull-up: U2.EN → 3V3_POWER_RAIL)
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SW2 (Boot/Flash Button):
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Pin 1 → U2.GPIO0
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Pin 2 → GND
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(R4 = 10kΩ pull-up: U2.GPIO0 → 3V3_POWER_RAIL)
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===============================================================================
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NET NAMES (FOR KICAD)
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===============================================================================
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Power Nets:
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+3V3, +5V, GND
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Signal Nets:
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ESP32_TX (U2.GPIO17 → U3.A1)
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ESP32_RX (U2.GPIO16 → U3.A2)
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AC_TX (U3.B2 → J1.Pin3)
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AC_RX (U3.B1 → J1.Pin2)
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ESP32_UART_TX (U2.GPIO1 → U4.RXD) [if USB-to-Serial]
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ESP32_UART_RX (U2.GPIO3 → U4.TXD) [if USB-to-Serial]
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WIFI_LED (U2.GPIO2 → R1 → LED1)
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BLE_LED (U2.GPIO4 → R2 → LED2)
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RESET_NET (U2.EN → SW1 → R3)
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BOOT_NET (U2.GPIO0 → SW2 → R4)
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===============================================================================
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NOTES:
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===============================================================================
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1. All GND pins must be connected to common ground plane
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2. Decoupling capacitors should be placed within 5mm of power pins
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3. Level shifter requires both 3.3V (VCCA) and 5V (VCCB) power
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4. ESP32 antenna area (top-right corner) needs 15mm clearance
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5. USB-to-Serial section is optional but recommended for easy programming
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6. If AC dongle doesn't need external power, J1.Pin1 can be left unconnected
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7. All unused GPIO pins can be left floating or pulled to GND via 10kΩ
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===============================================================================
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