2 layers70.6 × 66.3 mm
Prototype Rev-
DiegoBriceno03/Portable-Biofeedback
Portable Biofeedback device for anxiety management
106 parts3
2 layers95 × 45 mm
Hdmi2c
wlcx/hdmi2c6A HTTP -> DDC (I2C) bridge
- Size
- 95 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 61
- Nets
- 111
- Pads
- 263
- Tracks, vias
- 535, 60
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 25 Jun 2021
- Updated
- 11 Aug 2022
Overview
Hdmi2c is an open-source printed circuit board by wlcx, from the wlcx/hdmi2c repository on GitHub. It is a 2-layer board of 95 × 45 mm with 61 parts on 111 nets, routed with 535 tracks and 60 vias.
It is built around the ESP32-WROOM-32, MIC5205-5.0YM5 and MIC5504-3.3YM5, with the BSS138 and BSS83P among its other parts. Its parts include 23 resistors, 8 transistors, 6 capacitors, 5 ICs and 3 connectors. It belongs with the interfaces and adapters boards and the ESP32 boards of this library.
Main components
5
ESP32-WROOM-32
SMD,18x25.5mm-40℃~+85℃ -98dBm 2.4GHz 2.7V~3.6V 20dBm Bluetooth4.2 ESP32-DOWDQ6 UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
MIC5205-5.0YM5
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 180mV@(50mA) 20V 2uA 5V 70dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsMIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsBSS83P
SOT-23MOSFETsTECH PUBLIC
README
readme.mdHDMI2C Monitor Controller
HDMI2C allows network control (via WiFi) of monitors connected to it via HDMI (via DDC). This allows you to build your own tooling and control systems for your monitors, rather than relying on awkward inconvient buttons and OSDs. Think of it as an API for your monitors.
This repository contains the hardware design, made with KiCAD. You can see the generated BOM and schematic here.
What could you build with this
- A physical brightness knob
- Switch inputs of both monitors simultaneously when you wake up your desktop PC or connect your laptop to your dock
- IDK probably some other weird shit
Features
- ESP32 WiFi MCU
- USB-C power and MCU serial connection
- With blinkenlights
- Two HDMI ports with:
- Level shifters to bring 5v DDC signals to 3.3v for the MCU.
- 5v HDMI presence detection, switchable from the MCU. This allows us to fake being unplugged and replugged from HDMI, if we need to.
- Two forward facing buttons
Firmware
It's floating around somewhere, I'll tidy it up and upload it at some point.
A word on monitor compatibility
Not all monitors implement DDC that well. Particularly of annoyance, some models I tested would not listen to DDC commands on inputs that were not active, which, given this project relies on you having a spare HDMI input which never carries any video, is kind of a deal breaker.
Known good monitors
- Dell U2515h - I personally have two of these and they work flawlessly.
Improvements for next rev
- Just use M3 mounting holes, M2.5 was a terrible idea
- Spare ESP32 IO broken out to headers for ease of hacking
- More ambitious, HDMI passthrough to allow use of the project without taking up a whole spare HDMI port.
Is it that useful tho?
You can achieve the same thing without having to build your own hardware with a Raspberry Pi 4. Support for dual monitor I2C (DDC) was added shortly before I started this project - guess I didn't check enough :-). This is a much more accessible means to achieve the same goal. However, if you want a more minimal solution that doesn't require an entire embedded linux system, this project may be for you.
Parts
61| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R7, R8, R9, R10 |
| 4 | 2k | Resistor_SMD:R_0603_1608Metric | R11, R12, R13, R14 |
| 4 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4, Q5, Q6 |
| 4 | MountingHole_2.2mm_M2_DIN965_Pad_with_paste | hdmi2c:MountingHole_2.2mm_M2_DIN965_Pad_with_paste | M1, M2, M3, M4 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C2, C3, C5 |
| 2 | 2.2k | Resistor_SMD:R_0603_1608Metric | R18, R20 |
| 2 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C1, C6 |
| 2 | 3.3k | Resistor_SMD:R_0603_1608Metric | R19, R21 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R16, R17 |
| 2 | 68R | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 2 | BSS83P | Package_TO_SOT_SMD:SOT-23 | Q7, Q8 |
| 2 | MIC5205-5.0YM5 | Package_TO_SOT_SMD:SOT-23-5 | U4, U5 |
| 2 | Q_NPN_BEC | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | SW_Push_shell | hdmi2c:SW_TH_Tactile_Omron_B3F-312x | SW2, SW3 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R15 |
| 1 | 22k | Resistor_SMD:R_0603_1608Metric | R22 |
| 1 | 47k | Resistor_SMD:R_0603_1608Metric | R23 |
| 1 | CP2102N-Axx-xQFN24 | Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U1 |
| 1 | ESP32-WROOM-32 | RF_Module:ESP32-WROOM-32 | U3 |
| 1 | G*** | hdmi2c:logo | svg2mod |
| 1 | HDMI1 | hdmi2c:WURTH_685119134923_HDMI | J7 |
| 1 | HDMI1_SCL | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP3 |
| 1 | HDMI1_SDA | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP4 |
| 1 | HDMI1_SH_GND | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | HDMI2 | hdmi2c:WURTH_685119134923_HDMI | J8 |
| 1 | HDMI2_SCL | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP7 |
| 1 | HDMI2_SDA | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP8 |
| 1 | HDMI2_SH_GND | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U6 |
| 1 | RX | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | TX | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_GCT_USB4085 | J1 |
| 1 | reset_sw | Button_Switch_SMD:SW_SPST_Omron_B3FS-101xP | SW1 |
Questions
How big is the Hdmi2c PCB?
It measures 95 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hdmi2c use?
61 parts, built around the ESP32-WROOM-32, MIC5205-5.0YM5, MIC5504-3.3YM5 and BSS138. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Hdmi2c KiCad files?
From the wlcx/hdmi2c repository on GitHub, at the commit this page was made from: the board is hdmi2c.kicad_pcb and its schematic hdmi2c.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hdmi2c design in my own project?
Its repository states no licence, so its author keeps all rights: ask wlcx before reusing the design.
Similar boards
- 2 layers68.6 × 53.3 mm
- 2 layers99.9 × 51.4 mm
GR AVR Programmer
GadgetReboot/AVR_Programmer
Atmel AVR programmer based on Arduino Pro Micro, intended for development into ISP and HVSP using various AVR programming interfaces and protocols.
52 parts7 - 4 layers500 × 34 mm
- 2 layers31.5 × 96.7 mm
- 2 layers50 × 50 mm
- 2 layers21.4 × 37.8 mm
Camera v2
proveskit/development_boards
Miscellaneous dev boards to test the components of the PROVES Kit on a smaller scale.
30 parts1 - 2 layers143.7 × 112.9 mm
