USB-Exp
This PCB is an expansion board that can be connected through the MySensors expansion connector (MYSX) to any other MySensors PCB that exposes this connector, but its perfect match is with the d-diot Mini-BT-Pcb-328P.
With this expansion board you can turn on/off 3 USB type A ports; the power state of each port can be controlled with the dedicated physical push button or in a “smart” way through the Home Assistant WebUI, which makes this board useful in many situations, like charging your smartphone, powering a Raspberry Pi or any other USB devices with the added value to manage or automate the process in your home automation hub.
The USB-Exp PCB has two connector for the external power:
- 1 micro USB port (5V DC)
- 1 Power jack (5-12V DC)
The board has also an FTDI and ICSP headers to easily program the MCU of the attached motherboard and this is how the USB-Exp board looks:
Below the schematics ( pdf format).
The schematic and the entire Kicad project are available for download in the dedicated d-diot github repository. In the repository you can find the gerber files of the PCB, so you can easily get 10 boards with about 5€ using an online PCB manufacturer like JLCPCB or PCB way.
Click the button below to download the complete set (zip) of gerber files necessary for the manufacturing of the board v.1.0.
Or order the PCB directly from PCBWay.
Visit the dedicated topic in the forum if you need to know more.
BOM
| References | Description | Value | Quantity | Vendor | Link | VPN | Manufacturer | MPN |
|---|---|---|---|---|---|---|---|---|
| R1- R2- R3 | Resistor 10 KOhm SMD 0805 | 10K | 3 | LCSC | view | C57859 | UNI-ROYAL(Uniroyal Elec) | TC0550F1002T5E |
| R7- R8- R9 | Resistor 100 KOhm SMD 0805 | 100K | 3 | LCSC | view | C57246 | UNI-ROYAL(Uniroyal Elec) | TC0525F1003T5E |
| R4- R5- R6 | Resistor 300 Ohm SMD 0805 | 300 | 3 | LCSC | view | C61685 | UNI-ROYAL(Uniroyal Elec) | TC0525F3000T5E |
| D1- D2- D3 | Blu Led SMD 0805 | BLU-LED | 3 | LCSC | view | C84259 | Foshan NationStar Optoelectronics | NCD0805B2 |
| U1 | DC adjustable buck converter mini 360 | MH-MINI-360 | 1 | NA | view | NA | NA | Mini-360 |
| SW1- SW2- SW3 | Push button SMD 3x6x2.5 mm | SW_Push | 3 | Alphago it | view | NA | NA | NA |
| JP1 | Male 2.54 mm pin header THT 1×03 | V select | 1 | LCSC | view | C49257 | BOOMELE(Boom Precision Elec) | C49257 |
| Q1- Q2- Q3 | N channel mosfet SMD SOT-23 | Q_NMOS_GSD | 3 | LCSC | view | C404846 | JESTEK | JST2300 |
| Q4- Q5- Q6 | P channel mosfet SMD SOT-23 | Q_PMOS_GSD | 3 | LCSC | view | C404849 | JESTEK | JST3415C |
| J7 | Male 2.54 mm pin header THT 1×06 | FTDI | 1 | LCSC | view | C190819 | nextron(Nextronics Engineering) | Z-211-0611-0021-001 |
| J6 | Male 2.54 mm pin header THT 2×03 | ICSP | 1 | LCSC | view | C65114 | BOOMELE(Boom Precision Elec) | C65114 |
| J1 | Micro USB port SMD | USB_B_Micro | 1 | LCSC | view | C10418 | Jing Extension of the Electronic Co. | C10418 |
| J3- J4- J5 | USB type A female connector SMD | USB-A-S-X-X-SM2-R | 3 | LCSC | view | C8328 | Jing Extension of the Electronic Co. | YJ-USB-AF-SMT-01 |
| J2 | 5.5 mm DC Power jack | Barrel_Jack | 1 | Mouser | view | 710-694106301002 | Wuerth | 694106301002 |
| P1 | Female 2.54 mm pin header THT 2×11 | MYSX_2.6 | 1 | LCSC | view | C132126 | CONNFLY Elec | DS1023-2*11SF11 |
Use the interactive BOM tool to see where to place each component
Firmware
The USB-Exp-firmware is available as a PlatformIO project in the d-diot github repo.
Follow the firmware upload guide to know how to flash your board with PlatformIO directly from your d-diot hub.
The configuration of the firmware is in the following files:
- Configuratin section of main.cpp
For each parameter, see the comments in the files.
Visit the dedicated topic forum if you need to know more.