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Pico flicker shield

Samuel20040521·flico·hardware/first-version/pico_flicker_shield.kicad_pcb

Pico flicker shield layout, top view — open source RP2040/RP2350 board by Samuel20040521

About the Pico flicker shield

Pico flicker shield is an open source RP2040/RP2350 PCB design by Samuel20040521, published on GitHub. It is a 2-layer board measuring 128.7 × 75.4 mm, with 26 components from 25 distinct parts.

Its main chip is the OPA320AIDBVR, from the RP2040/RP2350 family. Other key parts include the TMUX1208PW, MCP73831-2-OT and 74HC4051. By type, the board carries 9 resistors, 4 ICs, 4 diodes and 3 capacitors.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

flico 是一台以 Raspberry Pi Pico 為核心、用來量測螢幕 / 光源閃爍(flicker)的小型自製 儀器。光訊號由 Vishay BPW34 矽 PIN 光二極體接收,經 Microchip MCP6004 跨阻 放大器(TIA)轉成電壓,由 Pico 的 ADC 取樣後,透過 USB-CDC 串列傳回桌面端的 Rust GUI(eframe + egui)即時繪出時域波形與 FFT 頻譜。

flico 是一台以 Raspberry Pi Pico 為核心、用來量測螢幕 / 光源閃爍(flicker)的小型自製 儀器。光訊號由 Vishay BPW34 矽 PIN 光二極體接收,經 Microchip MCP6004 跨阻 放大器(TIA)轉成電壓,由 Pico 的 ADC 取樣後,透過 USB-CDC 串列傳回桌面端的 Rust GUI(eframe + egui)即時繪出時域波形與 FFT 頻譜。

- 螢幕 PWM 調光的可見化:筆電 / 手機 / 顯示器低亮度下的 \~200 Hz–25 kHz PWM 閃爍, 用肉眼看不到,但會讓人疲勞、頭痛。 - 日光燈 / LED 燈具的 100 Hz / 120 Hz 漣波:確認照明品質。 - 遮蔽測試:用手指、紙片在 BPW34 前面晃動,即時看 ADC 訊號擺動,驗證整條訊號鏈。

Main components on the Pico flicker shield

OPA320AIDBVRTMUX1208PWMCP73831-2-OT74HC4051

Pico flicker shield bill of materials (BOM)

26 components, 25 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
OPA320AIDBVR
RaspberryPi_Pico
U1
1
TMUX1208PW
MCP6002-xMC
U2
1
MCP73831-2-OT
U3
1
74HC4051
U4
1
1n
Cf2
1
330p
Cf3
1
33p
Cf4
1
4.7p
Cf5
1
Conn_01x04_Pin
OLED_Screen1
1
4.7k
Re1
1
BPW34
D1
2
SS14
D2, D4
1
LED
D3
1
0.1P
100n
C1
1
100n
C2
1
10P
100n
C3
1
100M
56k
R1
1
1.8k
R2
1
10M
2k
R4
1
1k
R5
Show 5 more
QtyPartRefs
1
100K
4.7k
R6
1
10K
10k
R7
1
100k
R8
1
100
1M
R9
1
2k
R10

Pico flicker shield design files

The KiCad project lives in the Samuel20040521/flico repository on GitHub; these links point at the commit this page was built from.

Pico flicker shield: common questions

What microcontroller does the Pico flicker shield use?

The Pico flicker shield is built around the OPA320AIDBVR, from the RP2040/RP2350 family.

How big is the Pico flicker shield?

The Pico flicker shield measures 128.7 × 75.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico flicker shield?

26 components, from 25 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Pico flicker shield design files?

From the Samuel20040521/flico repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Pico flicker shield design in my own project?

The repository has no license, so all rights stay with Samuel20040521. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Pico flicker shield without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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