ESP32-C3 SuperMini antenna modification (peterneufeld.wordpress.com)
72 points by ta988 14 hours ago
bArray 7 hours ago
Antenna design is a dark art, I like simple hacks like this.
> The two parts of the antenna are intentionally designed to create an omnidirectional radiation pattern without a pronounced directionality.
I worked on a project a while back to try to utilize this to detect the arrival direction of WiFi signals approximately based on received strength. Do this for enough base stations and you have a very crude positioning system.
TGower 4 hours ago
I'm doing something similar, using the directionality of the antenna to turn an ESP32 into a high RPM gyroscope for use in a combat robot. Standard gyro chips top out well under 1000 RPM, and are much more expensive than an ESP32 board, plus the ESP can serve as the radio control link and brain of the bot at the same time.
Joel_Mckay 6 hours ago
It also immediately invalidates FCC modular component compliance, and may be illegal if operating on dual-use bands like 5G wifi.
Remember the rules limits use the ERP, and EEs may have added a crappy antenna on purpose to meet the legal limits.
https://en.wikipedia.org/wiki/Effective_radiated_power
There are also medical radiofrequency exposure guidelines, and they mitigate deep tissue burns or "G5 Mind control beams" concerns. lol =3
https://www.canada.ca/en/health-canada/services/health-risks...
vkdelta 6 hours ago
Exactly… they would have added crappy antenna as they likely meet emission, spurious or harmonics requirements..
Engineer might be messing with other 2.4GHz devices by doing this
dgacmu 3 hours ago
tylerflick 5 hours ago
spacedoutman 6 hours ago
You can just ignore the FCC.
They are completely toothless.
jubilanti 19 minutes ago
chemeril 5 hours ago
bikezen 3 hours ago
minimaltom 3 hours ago
Silver-coated wire? I don't have that lying around.
fluxflexer 2 hours ago
Nothing special about it. https://amzn.eu/d/06dMTm5c
Handy to garrot werewolves too