2 layers
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12 parts14kMIT
2 layers36.8 × 16.5 mm
I2c header x5
chudsaviet/ntpclock29NTP synchronized desktop 7-segment clock
- Size
- 36.8 × 16.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 5
- Pads
- 33
- Tracks, vias
- 15, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 23 Aug 2021
- Updated
- 25 Jan 2022
Overview
I2c header x5 is an open-source printed circuit board by chudsaviet, from the chudsaviet/ntpclock repository on GitHub. It is a 2-layer board of 36.8 × 16.5 mm with 12 parts on 5 nets, routed with 15 tracks and 0 vias.
It belongs with the lEDs and displays boards of this library.
README
README.mdNTP synchronized desktop 7-segment clock
Features
- NTP sunchronization using WiFi.
- RTC backup - will show time from a high precision RTC if WiFi is not available.
- Automatic display brightness control.
- Automatic timezone data update from online TZDATA database.
- Settings via WiFi AP mode and a web page.
Pictures
Bill of materials
| Part | Price |
|---|---|
| ESP32, Generic DevKit V1 | $8 |
| Adafruit 1.2" 7-segment display | $18 |
| DS3231SN RTC module | $18 |
| Adafruit VEML7700 lux sensor | $5 |
| Custom I2C and power hub board | $5 |
| Jumper wires, Female-Female | $2 |
| M3, M2.5 and M2 bolts | $5 |
| 3D printed plastic enclosure | $8 |
| Tint film (ex. for cars) | $1 |
| ------------------------------- | ----- |
| Total | $70 |
Building and running the device
- Manufacture I2C/Power hub using files from
cad/i2c_header_x5. Don't forget 3.2K pull-up resistors. - 3D print enclosure using files from
cad/enclosure. - Apply tint film to the display module.
- Assemble the device. Select appropriate screw diameter and length for each hole. Connect hub 5V to VIN in ESP32, ground to ground, 3.3V to 3.3V, SDA/SCL to appropriate ESP32 pins. Connect every component to the hub.
- Install ESP-IDF v4.4 - https://github.com/espressif/esp-idf/tree/release/v4.4 .
- Clone repository and init submodules recursively.
- Copy
main/secrets.hfrommain/secrets.h.exampleand set your own setting inside. - Using instructions from EPS-IDF, build and flash the firmware.
Changing settings after flashing firmware
- To change settings after flash, connect the device to power and press 'SET' button on the bottom.
- Device will create a WiFi AP with SSID looking like
ntpclock-XXXXXXXX. - The password will be shown scrolling on display.
- Connect to AP and open http://192.168.4.1 .
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | Conn_01x05_Male | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | 3V3, 5V1, GND1, SCL1, SDA1 |
| 2 | 4K7 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R0, R1 |
The 7 most common of 12 parts.
Questions
How big is the I2c header x5 PCB?
It measures 36.8 × 16.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the I2c header x5 use?
12 parts. 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 I2c header x5 KiCad files?
From the chudsaviet/ntpclock repository on GitHub, at the commit this page was made from: the board is cad/i2c_header_x5/i2c_header_x5.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the I2c header x5 design in my own project?
Its repository states no licence, so its author keeps all rights: ask chudsaviet before reusing the design.
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