2 layers50 × 35 mm
Bms4 f051
GyrocopterLLC/bms4-rust
Battery management system (bms) for 4 series Li-Ion cells programmed in Rust
63 parts1MIT
2 layers90 × 50 mm
Hamradiocard
juhapark21/hamcardA small dashboard showing propagation conditions
- Size
- 90 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 62
- Nets
- 90
- Pads
- 219
- Tracks, vias
- 931, 153
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 Jun 2026
- Updated
- 18 Jun 2026
Overview
Hamradiocard is an open-source printed circuit board by juhapark21, from the juhapark21/hamcard repository on GitHub. It is a 2-layer board of 90 × 50 mm with 62 parts on 90 nets, routed with 931 tracks and 153 vias.
It is built around the 74HC595D and LTST-C155GEKT. Its parts include 29 resistors, 21 diodes, 5 ICs, 4 capacitors and 1 switch. It belongs with the ESP32 and RISC-V boards of this library.
Main components
2
74HC595D
SOP-16-40℃~+105℃ 1 100MHz 15ns@6V,50pF 2V~6V 74HC 8 Asynchronous clear function、Output enable Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSJSMSEMIShift Registers
LTST-C155GEKT
SMD-4P,3.2x2.7mm-55℃~+85℃ 100mW 130° 20mA 2V、2.1V 565nm、630nm 569nm、621nm 6mcd、7mcd Discrete Diode Orange Red, Yellow Green Water Clear SMD-4P,3.2x2.7mm LED Indication - Discrete ROHSLite-OnLED Indication - Discrete
README
README.mdHam radio card
A small dashboard that displays propagation conditions with colored LEDs.
How to use
Replace the placeholder values in the firmware with the SSID and password of your known wifi network. This makes it so that the microcontroller can connect to a network and access the weather data online.
Assemble the PCB. Components are sized to be possible to hand-solder - A few components are through-hole for ease of hand-soldering.
After assembling the PCB, flash the firmware onto the XIAO ESP32C3 (instructions here).
Connect the ESP32 to a power source via USB-C and turn the power switch ON. The indicator light on the bottom right corner will turn on.
As long as the board is connected to a network and a power source, it will update its data every hour and the indicator lights will change accordingly.
LED indicator lights ordered by general severity:
- Green: Good-Great
- Yellow: Fair
- Orange: Fair-Poor
- Red: Poor
To turn off, turn the power switch OFF then disconnect the board from the power source.
Why
Propagation info like this is like the weather report for radio nerds. It helps determine which bands you should work, or approximately how far your signal will reach.
I initially made it because I wanted a fun useful business card. That idea got a bit out of hand (the thickness and power consumption of this does not make it very suitable to be used as a card), but I ended up with a nice physical dashboard showing useful weather information for amateur radio.
Most existing dashboards are online, so I wanted this to be a physical object separate from tabs or apps on my computer.
Process
The design and build process is documented in detail here. Even though this project was smaller-scale, it involved a lot of trial-and-error.
Credits
Thank you Paul N0NBH for the solar-terrestrial data.
Zine page
Parts
62| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 200Ω | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R11, R13, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29 |
| 13 | 100Ω | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R12, R14, R15 |
| 13 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D12, D15, D16 |
| 8 | LTST-C155GEKT | hamradiocard:DIODE_LTST-C155GEKT_LTO-M | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 |
| 4 | 0.1uF | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2, C3, C4 |
| 4 | 74HC595D | hamradiocard:SOT109-1_NXP | U2, U3, U4, U5 |
| 2 | LOGO | LOGO | G***, G*** |
| 1 | SW_SPDT | hamradiocard:SW3_SLW-883935-2A-D_SSY | SW1 |
| 1 | XIAO-ESP32-C3-DIP | hamradiocard:XIAO-ESP32C3-DIP | U1 |
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Questions
How big is the Hamradiocard PCB?
It measures 90 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hamradiocard use?
62 parts, built around the 74HC595D and LTST-C155GEKT. 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 Hamradiocard KiCad files?
From the juhapark21/hamcard repository on GitHub, at the commit this page was made from: the board is pcb/hamradiocard.kicad_pcb and its schematic pcb/hamradiocard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hamradiocard design in my own project?
Its repository states no licence, so its author keeps all rights: ask juhapark21 before reusing the design.