# pwl-video-search — search log

**Date:** 2026-06-30
**Task:** Find Chinese engineers / makers / small studios who can build a wrist-worn pneumatic prototype (micro air pump + solenoid + pressure sensor + MCU + 3D-printed wrist housing + bladder). NOT a medical device. ~2-4 week bench prototype.

## Channels queried

| Channel | Method | Result |
|---|---|---|
| Bilibili | `api.bilibili.com/x/web-interface/search/all/v2` (public JSON API) | ✅ Works from this box. 594 unique items across 18 queries. |
| CSDN | `so.csdn.net/api/v3/search?q=…&t=blog` (public blog search API) | ✅ Works. 140 items across 12 queries. |
| Zhihu | `www.zhihu.com/api/v4/search_v3` + `?search?type=content` | ❌ Blocked with `need_login` (datacenter IP gate, captcha wall) |
| Bing site: | `bing.com/search?q=site:zhihu.com+…` | ❌ Cloudflare "One last step" challenge |
| Google site: | `google.com/search?q=site:csdn.net+…` | ❌ Consent screen on datacenter egress |
| Sogou | `sogou.com/web?query=…` | ❌ Anti-spider block (`antispider/?m=1&…`) |
| DuckDuckGo HTML | `html.duckduckgo.com/html/` | ❌ Returns no results; web_search tool errored (403) |
| Brave Search | `search.brave.com/search` | ❌ Served a SvelteKit SPA bootstrap with no results, captcha-baited |

**Net effect:** Bilibili + CSDN are the only channels that yielded real data this run. Zhihu is the original "self-presentation / open-for-hire" hub in the Chinese maker ecosystem, so the loss of Zhihu coverage is a real gap — the AGENTS.md notes that this is a known datacenter-IP issue. Caveat: leads found in Bilibili/CSDN are stronger evidence of build skill (videos + schematics + code) than Zhihu answers would have been.

## Queries run

### Bilibili (18 queries, 2 pages each, 20 results = 720 slots)
`微型气泵 STM32 压力`, `腕带 气囊 DIY`, `气泵 PID STM32`, `穿戴 气泵 DIY`, `血压计 气泵 STM32`, `按摩枪 微型气泵`, `嵌入式 接单 私活`, `按摩气囊 嵌入式`, `ESP32 气泵 传感器`, `气动 软体机器人`, `气动 穿戴 项目`, `气泵 电磁阀 压力控制`, `气泵 调压 控制`, `气泵 闭环 压力`, `STM32 气压采集`, `STM32 智能手环 气压`, `STM32 充气泵`, `气泵 调速 控制`

### CSDN (12 queries, 1-2 pages each, 30 results = 140 items)
`微型气泵 STM32 压力传感器`, `气泵 PID STM32 教程`, `腕带 气囊 单片机`, `气泵控制器 单片机`, `气泵 压力 控制 闭环`, `按摩枪 控制器 DIY`, `气压止血带 STM32`, `ESP32 气泵 压力`, `血压计 气泵 STM32`, `可穿戴 气压 单片机`, `智能手环 气压`, `气动 软体 机器人 嵌入式`

## Scoring rubric (applied)

- **9-10** = proven pump + valve + sensor + MCU wearable build with video evidence of a working demo.
- **7-8** = strong pump OR wearable prototyping history with visible builds; or perfect-fit control-theory writeup.
- **5-6** = relevant but limited (e.g. PID motor instead of pump; pressure-sensor build but no pump).
- **≤4** = speculative (skipped).

## Top-of-list findings

1. **赤鱼科技** (B站 mid 1786633509) — studio-style channel with 5+ pump-Arduino-sensor videos. Their "集成化气泵02——动态呼吸" is a working inflatable "lung" driven by a custom PCB-integrated dual pump (抽气+充气 replacing a solenoid), with film-pressure-sensor input. The intro for another video openly says "近期接到的一个需求昂" (recently took a custom request) and points customers to @赤鱼科技 — this is the strongest "open for hire" signal in the entire set.

2. **Arduino交互-陈师傅** — single video with full BOM: Arduino UNO + 12V 充气气泵 + 12V 放气气泵 + 12V 两位三通电磁阀 + 四路MOS管模块 + 硅胶软管 + 红外传感器. Maps almost 1:1 onto our BOM (pump+valve+bladder+MCU+MOS-driver). They clearly build, not just review.

3. **王子塑化饼干** — title literally: "Arduino交互气泵 对气囊进行充放气 更换传感器可以实现不同的交互效果 欢迎咨询定制". Direct custom-work solicitation. Tiny channel (390 views) but the title is a perfect-fit.

## CSDN patterns observed

Many top results on CSDN under these queries are commercial **PCBA方案** posts (authors like `szxcwk`, `peakcoo`, `synwit`, `hoperf01`) — those are OEM/方案公司 who spec parts for mass production, not the bench-prototype builders we want. The makers more relevant to a 2-4 week prototype (in order of fit):
- `y2z3a4b5c` — single deep "PID控制气泵压力" article, exact control-loop theory.
- `white` (笔名 老张) — 10+ years automation engineer, detailed writeup on MOS-driver for pump+solenoid.
- `nginx7reverse` — same theme with a complete circuit diagram.
- `lza_csdn2019` — *智能气压按摩仪* and *微压脉冲发射仪* are direct wearable-pneumatic-cuff designs (commercial方案 but real prototype know-how).
- `weixin_33256096` — STM32F407 水族馆 system that uses TIM2 PWM to drive a 微型气泵 for DO control — direct pump+MCU build.

## Negative findings (explicitly excluded)

- **dido 气泵血压手表** reviewer (`纯洁善良的孩子` / BV18SzPYYE3o) — only a product unbox review, not a maker.
- **淘宝店铺合肥通旺科技** — pure 毕业设计 / coursework seller. Many of their videos are STM32 bracelet projects but they outsource via Taobao and don't appear to be individual makers.
- **szxcwk / peakcoo / synwit / hoperf01 / hoperf** on CSDN — PCBA方案 / 充气泵方案 commercial blogs (electric-car tyre inflator market), not relevant to wrist-pneumatic prototyping.
- **车用充气泵 / 鱼缸氧气泵** channels (FLEXTAIL鱼尾, 养鱼翼族, etc.) — product reviewers, not pump-control builders.

## Files written

- `/home/claw/.openclaw/workspace/projects/pneumatic-wrist-prototype/leads-video.csv` — 15 leads, header `score_1_to_10,lead_name,url,note,search_query_that_found_it`
- `/home/claw/.openclaw/workspace/projects/pneumatic-wrist-prototype/search-log-video.md` — this file

## Caveats / follow-up

- All lead evidence is from public B站 video metadata + CSDN blog content. Did not visit lead pages / read full schematics. Before any outreach, re-confirm each lead is still active and check their contact (some signal "欢迎咨询定制" in titles, others are public-only).
- Bilibili per-video pages return 412 from this egress, so the BV → /video/BV* page can't be re-fetched headless. The arcurl in the CSV is taken straight from the search-API response.
- Zhihu was unreachable. Worth retrying from a residential proxy if more leads are needed; many Chinese freelance embedded engineers self-describe there.
- 赤鱼科技's mid (1786633509) only shows ~5 of their videos in our search; their actual catalogue is probably larger. Use the B站 space page (when reachable) to enumerate all their pump videos.