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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
The Waveshare Pico Relay B is an industrial 8-channel relay module with power-supply and photocoupler isolation. It provides a protected ABS enclosure with rail-mount support, breakout USB and BOOT pins, and status indication via PWR LED, RGB LED and passive buzzer.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL20218 WSAL20218 – Industrial 8-Channel Relay Module for Raspberry Pi Pico, Multi Protection]<br />
<br />
== Technical overview ==<br />
* Operating voltage: 5 V; communication via Micro USB at 115200 baud.<br />
* Eight relays in form 1NO/1NC, contact rating up to 10 A / 250 V AC or 30 V DC.<br />
* Each relay is driven by its own GPIO: CH1–CH8 on GP21–GP14.<br />
* RGB LED on GP13, passive buzzer on GP6.<br />
* ABS enclosure supports rail mounting; USB and BOOTSEL are accessible from the enclosure.<br />
* Flashing firmware uses bootloader mode (hold BOOTSEL while plugging in USB).<br />
* C sample project is built with CMake; the resulting main.uf2 is copied to the RPI-RP2 drive.<br />
* MicroPython firmware files: rp2-pico-20210418-v1.15.uf2 and rp2-pcio2-20240809-v1.24.0.uf2 for Pico 2.<br />
* For Pico W: because the BOOT pad location differs, the bundled BOOT switch cannot enter flash mode.<br />
* TCP control commands via the built-in TCP server: 'Relay 1' through 'Relay 8', 'Relay ALL OFF', 'Relay ALL ON'.<br />
* Serial hex protocol: 01–08 toggle individual channels, 09 = all off, 0A = all on.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
01<br />
02<br />
03<br />
04<br />
05<br />
06<br />
07<br />
08<br />
09<br />
0A<br />
Relay 1<br />
Relay 2<br />
Relay 3<br />
Relay 4<br />
Relay 5<br />
Relay 6<br />
Relay 7<br />
Relay 8<br />
Relay ALL OFF<br />
Relay ALL ON<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The source contains no information about certifications, warranty, or pricing; these must not be assumed.<br />
* Version sensitivity: the correct MicroPython firmware depends on the specific Pico variant (Pico vs. Pico 2).<br />
* Pico W requires manual configuration of WiFi settings (SSID, password, server IP, port) before compiling.<br />
* For first-time Arduino uploads, select the uf2 board first; if issues arise, a clean reinstall of the Arduino IDE plus manual cleanup of the AppData folder may be needed.<br />
* All command sequences should be verified against the current firmware version before production use.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-Relay-B Pico Relay B - Waveshare Wiki]<br />
* Source revision: 91368<br />
* Captured: 2026-09-02T03:33:06+00:00<br />
* SHA-256: <code>5026e16972ec97a79643bdc724f5de8ff5e57e672420613f26a3b075bf94aa6b</code></div>JWTechPublisher