shifting the resonance frequencies and maybe the gain. The ways that they affect the antenna performance can be many, e.g. For example, the 3D printer is made from aluminum and steel, lots of it, which are both conductive and this means that they affect the antenna. There are many ways that the performance of the antenna can be affected, like the material is used to build the antenna itself, the position of the antenna, the rotation and also other factors. That camera is based on the ESP32 and it has a fish-eye lens and also it doesn’t have an integrated antenna, but an SMA connector for an external antenna.Īt some point I was curious how well those antennas actually perform and how they’re affected from the surrounding environment. Some time ago I’ve bought a WiFi camera for my 3D printer, that was before I switched to octopi. Many modules, like the ESP-01 come with an integrated PCB antenna, but also many modules are using external antennas. I guess that many tons of WiFi modules are sold every year. I’ll try to keep this post simple as I’m not an RF engineer, so if you are then this post is most probably not for you as it’s not advanced. With less than $2 you can just add to your device an IEEE 802.11 b/g/n Wi-Fi module with integrated TR switch, balun, LNA, power amplifier and matching network and support for WEP, WPA and WPA2 authentication.īut all those awesome features come with some difficulties or issues and in this post I’ll focus on one of them which are the antennas. Anyway, today using a wireless module has became the standard as it became easy and cheap to use and also it doesn’t need a cable to connect to ends.Īctually, it’s amazing how cheap is to buy an ESP-01 today, which is based on the ESP8266. Later, the serial-to-ethernet modules (like xport from Lantronix) replaced serial cables and then WiFi (or any other wireless technology like BT and LoRa) came into play. Back in my days (I’m not that old) that was a serial port (RS-232 or RS-485) sending data to a computer. Many IoT projects are using some kind of interface for transmitting data to a server (or cloud which is the fancy name nowadays).
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