ESP32-S3-DevKitC-1

PDF_ESP32-S3-DevKitC-1.zip

Altium_ESP32-S3-DevKitC-1.zip

PADS_ESP32-S3-DevKitC-1.zip

BOM_ESP32-S3-DevKitC-1.xlsx

93324

This is Friday Ink, an e-ink calendar with Friday detection.

An e-ink calendar powered by a coin cell battery, but without much battery anxiety.

Is today Friday?
(Bilibili video introduction)
GitHub project address
MakerWorld address



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This is a device that uses CH582F as the main controller, an e-ink screen as the display medium, and is powered by a CR2032 button battery.
Essentially a calendar, but with the addition of Friday detection, it becomes a Friday detector.
Inspired by the iOS widget of the Jike App.
PCB Preview



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Basic Parameters
Hardware Parameters

Main Controller CH582F 32KB RAM + 448KB Flash
Clock Chip PCF8563T
Screen 1.54-inch e-ink screen SSD1607
DC-DC Chip SGM6603-3.3YN6G
Power Supply CR2032 Battery

Note:

When using the SSD1607 screen driver IC, an SGM6603 needs to be soldered, as the SGM6603 is needed to completely disconnect the e-ink screen power supply.
I picked up this screen from Xianyu (a second-hand marketplace). After buying it, I found that it had the same silkscreen as a 9.9 RMB Hezhou e-ink screen, and the driver IC was also the same.
In actual use, the power consumption in sleep mode never decreased. So, in a fit of anger, I added a DC-DC converter to manage the power supply of the e-ink screen. This effectively reduced its sleep current from 70μA to 3μA.


When using the SSD1681 screen driver IC, there's no need to solder the SGM6603. In this case, a 0-ohm resistor is used to short-circuit pins 5 and 6 of the SGM6603, and there's no need to solder the 4.7μH inductor below the SGM6603.
This is currently the black and white dual-color e-ink screen sold by Zhongjingyuan. The display effect is much better than the one I bought on Xianyu. Although the resolution is the same (200x200), the effect is clearer and the contrast is better. The downside is that it's more expensive than the one I bought for 5 yuan on Xianyu.
Because it can sleep normally, a DC-DC converter is no longer needed, and the power consumption is slightly better than the SSD1607 version.



Dimensions:

34mm × 39mm × 8mm.

Power consumption information:

Sleep state ≈ 3μA;
Refresh 10~20mA, immediately enters sleep mode after refresh.

Calibration instructions:
Press and hold the button during power-on. Enter time synchronization mode, and release the button after seeing the image below.
The device will then search for nearby Bluetooth broadcasts. It will automatically restart when a time broadcast matching the agreed-upon format is found.
The time broadcast format is 'F' + a hexadecimal string of the timestamp + 'R'. You can use a small program called Friday Ink Time Synchronization for time synchronization.
If no matching time broadcast is found within 20 seconds of entering time synchronization mode, it will automatically exit synchronization. It is recommended
to compile and flash the firmware
in a Linux environment. Here, I am using the Ubuntu subsystem within WSL2.

Clone this project, cd into it, and execute `git submodule update --init --recursive`
to install Rust
. Follow the Release interface of the riscv-gnu-toolchain repository to download riscv32-elf-ubuntu-22.04-gcc-nightly, configure the environment variables
according to your MRS_Community, and modify the header file directory in `u8g2_rs`.
Modify the screen creation parameters in `main.rs` according to the screen type. Execute `
cargo`. The `build-hex` command obtains a pre-compiled hex file.
Using WCHISPStudio in serial mode, the hex file is downloaded.

Q
&A
: Q: What to do if time calibration gets stuck on the calibration page?
A: It's recommended to send a time broadcast beforehand to ensure the phone and device are close enough. Then, the device enters calibration. If it fails to automatically exit calibration after 20 seconds or the button cannot force exit calibration, remove and reinstall the battery.
Known issue:

Time calibration has a certain probability of getting stuck on the calibration page .
Consider introducing a watchdog timer. The watchdog timeout resets


the FPC socket HC-FPC-05-09-24RLTAG. This socket model is different from the one I bought on Taobao, but the contact is more reliable. The trade-off is that the e-ink screen ribbon cable extends beyond the PCB area.

References:

ch58x-hal
CH582F schematic; azunya's button battery Bluetooth thermometer CR1220+CH592F+SHT40.
The SSD1681 driver comes from pigot's U8g2_Arduino

update log.

August 3, 2024:
Added SSD1681 compatibility
information, supplementary Q&A, and references.

PDF_This is Friday Ink, an e-ink screen calendar with Friday detection..zip

Altium_This is Friday Ink, an e-ink calendar with Friday detection..zip

PADS_This is Friday Ink, an e-ink calendar with Friday detection..zip

BOM_This is Friday Ink, an e-ink screen calendar with Friday detection..xlsx

93327

STC32 Development Board

The STC32G12K128 development board integrates many commonly used peripherals in learning.

 
The STC32 development board only has individual buttons and LED running lights soldered on. Testing showed all functions work correctly. It references the official STC "Dragon Slayer" development board. Having recently learned the classic 51 microcontroller, I added matrix buttons, temperature and humidity control, DS1302 clock, infrared, digital tube display, and Bluetooth functionality, referencing the Puzhong 51 development board.
The power supply section has 5V and 3.3V, with all pins brought out .
For program upload,
simply connect to the computer via USB and use the official STCsip software to download the program, as shown in the image below.
Simple running light test:

WeChat_20240803125518.mp4

PDF_STC32 development board.zip

Altium_STC32 development board.zip

PADS_STC32 development board.zip

BOM_STC32 development board.xlsx

93328

Colorful Flowing Lights_LED-5050RGB

This project utilizes 5050RGB tri-color LEDs and auxiliary components to achieve a colorful running light function. It can be used for microcontroller learning, offering diverse color combinations and allowing for various color displays by utilizing the brightness ratios of the three colors.
Due to the limited I/O driving capabilities of the microcontroller, transistors are used for driving.

Circuit board images,
finished product images

Marquee video.mp4

RGB LED Display Program_5050RGB_V3.rar

PDF_Colorful Flowing Lights_LED-5050RGB.zip

Altium_Colorful Flowing Lights_LED-5050RGB.zip

PADS_Colorful Flowing Lights_LED-5050RGB.zip

BOM_Colorful Flowing Lights_LED-5050RGB.xlsx

93330

SX1308 Fixed 5V Positive and Negative Voltage Module

The SX1308 positive and negative power supply module has a fixed 5V voltage, is inexpensive, and is easy to replicate.

The SX1308 fixed 5V positive and negative voltage module allows voltage modification by adjusting resistors R1 and R2. SEPIC boost converter with CUK inverted output.