1.7 KiB
1.7 KiB
AC Connection Guide
JST-XH Connector on PCB (J1)
The PCB includes a JST-XH 4-pin connector (J1) for connecting to your AC unit.
Connector Specifications
- Type: JST-XH (2.5mm pitch)
- Pins: 4-pin
- Part Number: JST-XH-B4B-XH-A (female connector on PCB)
- Library:
Connector_JST:JST_XH_B4B-XH-A
Pinout (J1 on PCB)
| Pin | Signal | Description |
|---|---|---|
| 1 | +5V | Power input for PCB - Powers the entire board |
| 2 | AC_RX | Receive line from AC (5V logic) |
| 3 | AC_TX | Transmit line to AC (5V logic) |
| 4 | GND | Ground reference |
Connection Method
- On PCB: J1 connector is mounted on the PCB
- Cable: Use a cable with JST-XH connector on one end
- AC Unit: Connect the other end of the cable to your AC unit's communication port
Cable Assembly
You'll need to create or purchase a cable with:
- One end: JST-XH male connector (matches J1 on PCB)
- Other end: Connector that matches your AC unit's port
Typical cable:
- JST-XH connector → AC unit's communication port
- 4 wires: +5V (optional), AC_RX, AC_TX, GND
Wiring Notes
- +5V (Pin 1) is the power input for the PCB - This powers the entire board (ESP32, regulator, etc.)
- AC_RX and AC_TX are 5V logic levels (shifted from 3.3V by TXB0104PWR)
- GND must be connected for proper communication and power
- Ensure proper wire gauge for power delivery (recommend 22AWG or larger for +5V and GND)
- The AC unit or external power supply must provide 5V DC to Pin 1
Safety
- Ensure AC unit is powered off when connecting/disconnecting
- Verify pinout matches your AC unit's requirements
- Double-check GND connection before powering on