Open Lab: How I Tested the Communication Distance of Seeed Studio XIAO ESP32C3

This time, we’re having our colleague Matsuoka from the Seeed Japan team show us how he measured the communication distance of Seeed Studio XIAO ESP32C3.

Hey community, it’s Monday, which is a perfect time for experiment and testing to freshen up the week.. This time, we’re having our colleague Matsuoka from the Seeed Japan team show us how he measured the communication distance of Seeed Studio XIAO ESP32C3.

Notes: The following contents is originally available in Japanese, written by Matsuoka on Seeed K.K. Lab. I translated and edited it into English with the help of GoogleTranslate. A big shout-out to Matsuoka for offering proofreading for it.


I bet there are some people who are doubted about the statement of XIAO ESP32-C3’s communication distance on the product page as it writes as “Powerful ESP32-C3 SoC and U.FL antenna support WiFi/Bluetooth connection over 100m.” We know that communication is possible at a distance of 100m or more, but is it really the case for XIAO ESP32-C3? So let’s experiment to test it out.

How I Tested It?
Ping www.google.com on the Internet via Wi-Fi from the XIAO ESP32C3. Get the round trip time of Wi-Fi RSSI((Received Signal Strength Indicator)) and Ping at that time and check if communication is good. The distance of 100m will be secured outdoors. I set the Orbi AX6000, which seems to be the strongest Wi-Fi access point I have, by the window on the second floor, and take the Seeed Studio ESP32C3 (and PC) outside to secure a distance of 100m.

For the XIAO ESP32C3 Antenna, I attached the XIAO ESP32C3 to the tip of a piece of cardboard so that it would not be affected by the metal parts of the PC.

Here is a picture of how I set up the XIAO ESP32C3 and PC for testing:

Seeed Studio XIAO ESP32C3 code was made for experimentation (Check this GitHub). Ping communication used ESP32Ping library.

What Are the Results?
Below you’ll find two pictures, the left one is about the RSSI, and the right one is about the round trip time.

The RSSI decreased when the distance increased. The Wi-Fi connection never drops even when the distance reaches over 100m.

The round-trip times are in the range of 20-30ms up to 20m, but after 50m, there were occasional delays. Over 100m, there were times when it was around 100ms. Ping itself never failed to communicate (lost). Somehow, I feel like the car was slow when it passed by the side where I was experimenting.

Summary
The Wi-Fi communication distance of Seeed Studio XIAO ESP32C3 covers over 100m. The response time varied beyond 50m.


That’s it for this entry. As always, we can’t wait to see what you make. Shoot us a tweet @seeedstudio, or let us know on LinkedInDiscord, or publish your project on our Project Hub on Hackster. Please be safe out there, be kind to one another, and we’ll see you next time with even more exciting news!

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