Cellular M‑HAT for Pi family

A Raspberry Pi can already run software and sensors, but it usually needs Wi‑Fi or wired internet to phone home. Particle’s new M‑HAT adds cellular service to Pi boards so remote projects can stay connected off-network. (particle.io) Particle said the board is now in general availability and built it for Raspberry Pi 3, 4, and 5 through the standard 40‑pin header. The company’s product page lists two versions: B504e for North America and B524e for Europe. (hackster.io) (particle.io) The radio uses Long Term Evolution Category 1, a lower-bandwidth 4G tier commonly used for telemetry, meters, and other devices that send modest amounts of data. Particle says the European B524e version includes 3G fallback, while the North American B504e is positioned as an LTE Cat 1 module. (particle.io) (store.particle.io) The board also carries a separate microcontroller, which works like a low-power helper chip beside the Pi’s main processor. Particle says that controller can keep basic monitoring and wake-up logic running while the Raspberry Pi itself is powered down. (particle.io 1) (particle.io 2) That setup targets a common Raspberry Pi problem in field deployments: the Pi can do heavier Linux work, but it is not designed for ultra-low-power standby on its own. Particle pitches the M‑HAT for systems that sleep for long stretches, wake on an event, send data over cellular, and go back to sleep. (particle.io 1) (particle.io 2) Particle bundled power hardware into the same board instead of treating the modem as a simple add-on. The company says the M‑HAT can take power from Power over Ethernet, direct current input, Universal Serial Bus Type‑C Power Delivery, or lithium‑polymer batteries, and it advertises nanoamp-class sleep on the communications side. (particle.io) The physical design leaves the Pi’s general-purpose input/output pins available through an extended female header, so other HATs or accessories can still stack on top. Particle’s store page says the board has three SMA antenna connectors for external antennas in installations with weak signal or enclosed hardware. (store.particle.io) (particle.io) Particle is also tying the board to its own service stack, not just the hardware. The company says the M‑HAT includes EtherSIM, with free low-bandwidth data for the first 100 devices, and supports over-the-air updates and Linux device management through Particle’s platform. (particle.io 1) (particle.io 2) Cellular Raspberry Pi add-ons already exist from vendors including Sixfab and Seeed, but those products are often framed mainly as modem carriers. Particle is selling the M‑HAT as a combined modem, power manager, and low-power controller for telemetry boxes, remote sensors, and edge systems that cannot count on local internet. (sixfab.com) (wiki.seeedstudio.com) (particle.io) The pitch is straightforward: keep the Raspberry Pi for Linux workloads, add a smaller chip to babysit power and connectivity, and use cellular when Wi‑Fi is not there. For remote monitoring projects, that changes the Pi from a lab computer into something closer to a field device. (particle.io)