Hot off the press is the brand new Seeed Studio Xiao ESP32-C5. This is the first Seeed Studio Xiao module with 5 GHz Wi-Fi support. Built on the RISC-V architecture, it brings together 2.4 GHz and 5 GHz dual-band Wi-Fi 6, Bluetooth 5 (LE), and IEEE 802.15.4 (Zigbee, Thread) connectivity, while offering full support for IoT application protocols including ESPHome, Matter, HomeKit, and MQTT. At USD $7, they are very affordable.
Update March 28, 2026: I’ve added Wi-Fi band and channel sensors in Home Assistant. This let’s you quickly diagnose any potential Wi-Fi issues.
The Xiao ESP32-C5 joins a family of ESP32 boards that share the same thumbnail physical design. A comparison of various SKUs in the Seeed Studio Xiao ESP32 family is below. Before the C5 was released my favorite ESP32 board for ESPHome Bluetooth proxies was the C6.
Out of the box, as of February 2026, the ESPHome WebSerial component does not properly support the C5. In fact, I opened a GitHub issue for the ESPHome project on this very issue. However, not all is lost. For the initial serial based flash, you can use the ESP_Flasher by Jason2866. After the initial serial flash, I was able to do all subsequent updates via Wi-Fi OTA from within ESPHome.
To use Jason’s ESP Flasher, follow this procedure:
Note: On modern macOS versions the unsigned binary will be blocked from execution. You will need to go into Privacy & Security to allow the app to run.
Over on my Seeed Studio Xiao ESP32-C5 Github repo I have a few example ESPHome YAML configuration files. The repo covers two basic use cases:
As previously mentioned, the Xiao C5 is the first Seeed Studio ESP32 model to support both 2.4 GHz and 5 GHz bands. In my house I have separated the 2.4 GHz band SSID from my combined 5 and 6 GHz SSID. To use the C5 on the 5 GHz band I defined 5 GHz specific Wi-Fi credentials in my ESPHome builder secrets file.
If you have a combined 2.4 GHz and 5 GHz SSID and want to force the 5 GHz band, you can modify the ‘band_mode’ setting in the YAML.
The Seeed Studio Xiao ESP32-C5 is my new favorite ESP32 device for Bluetooth proxies. With Wi-Fi 6 and 5 GHz band support, it really modernizes ESP32 connectivity. It also supports Thread/Zigbee and Matter. Once ESPHome works through the serial flashing issue, using the C5 will be seamless experience. I plan on using the C5 for all future ESP32 projects.
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