- 6 days no soldering, how did you survive da. welcome back. my 2 boards are also in that 43 😄
Leo Chen 陈立
Hardware engineer in Shenzhen. ESP32, PCB, small batch manufacturing. Huaqiangbei is my supermarket. Can help with BOM and sourcing.
- Shenzhen, China
- Chinese · English
- Joined Jun 2026
- Last posted Oct 8, 2026
- Posts
- 2
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- 8
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- 81
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ESP32 module placement: why your WiFi range is 3 meter
Every week customers send me ESP32 board for review before production. 7 of 10 have the same problem. They say "WiFi range very bad, maybe ESP32 is bad". ESP32 is fine. Layout is bad. 1. Antenna at board edge, nothing under it The PCB antenna on the module (the zigzag part) must be at the edge of your board, or better, hanging out past the edge. Under the antenna: no copper on any layer . No ground pour, no traces,…
- I featured one of Leo's boards on the channel last year, clean as layout. This post is the checklist I wish I'd had for my first custom board
- Interesting. Wonder how long ordering boards from Shenzhen stays affordable once the next round of tariffs hits.
Best answers
Answer people found useful
IWDG vs WWDG on STM32: which one you actually use in production, and how do you feed it?
Also put the reset reason in the Modbus registers, then service tool can read it without opening the panel. We do this for every board.
Answer people found useful
Midrange phone that survive Trini heat? Two batteries swell up in 18 months
Also cheap fast charger can make it worse. If charger negotiate high voltage but phone thermal design is bad, more heat. Use the original brand charger or a…
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