Raspberry Pi as a 2.4 GHz Wi-Fi Access Point for Local Sensor Hubs
Use a Raspberry Pi with hostapd and dnsmasq to create a low-cost 2.4 GHz Wi-Fi access point for sensor hubs and labs, with DHCP, NAT and basic firewalling.
Loading…
ReadMeFeed / Community knowledge
#raspberry-pi
Real questions. Useful conversations. Find the people who know your stack.
raspberrypiUsing Raspberry Pi's Built‑in Hardware Watchdog for Automatic Recovery
Enable the Raspberry Pi’s built‑in bcm2835‑watchdog driver and a small userspace daemon to get automatic recovery from software hangs without extra hardware.
Architecting a Headless Raspberry Pi IoT Gateway for Sensor Aggregation
Learn how to build a stable, headless Raspberry Pi IoT gateway using read-only filesystems, hardware watchdogs, and strict logic-level boundaries to prevent SD corruption and downtime.
Managing Raspberry Pi GPIO: BCM vs. BOARD Numbering and Voltage Safety
Learn the critical differences between BCM and BOARD numbering in Raspberry Pi GPIO, how to prevent SoC damage via voltage management, and how to implement stable inputs using pull-up resistors.
pythonExtended verification time after restoring a full Raspberry Pi SD‑card image
After restoring a Raspberry Pi system from a full .img backup created with Raspberry Pi Imager, administrators often need to confirm that the recovered data matches the original before putting the board back into service. The goal is to achieve reliable verification while limiting the time spent on checks and reducing wear on the SD card caused by repeated f
Raspberry Pi network boot DHCP retry timeout configuration
The Raspberry Pi 4 and 5 support PXE network boot via EEPROM settings, yet the bootloader’s DHCP client uses hardcoded retry intervals that cannot be tuned through documented configuration files. When a DHCP server is slow or a network has high latency, the default five‑retry, two‑second‑interval scheme can cause boot failures or excessive delays. No config.
GPU memory split behavior change on 64-bit Raspberry Pi OS
Documented behavior shift The Raspberry Pi 4's gpu_mem parameter in /boot/config.txt has historically controlled the GPU/CPU memory split on 32-bit Raspberry Pi OS, with values such as 256 MB being honored directly. Starting with the 64-bit Raspberry Pi OS (Bullseye and later) and bootloader firmware 2022.02, a new gpu_mem_256 flag was introduced that appear
Boot partition not found: capturing early-boot diagnostics without serial console
When a Raspberry Pi fails to mount the boot partition during SD-card boot, the kernel never starts and no logs are written to the filesystem. The bootloader emits diagnostic messages only on the serial console (ttyAMA0 or ttyS0), which requires a USB-to-serial adapter and an active capture session at power-on. Without that hardware, the only visible symptom
INSERT OR IGNORE idempotency shift with WAL mode on Raspberry Pi SQLite
On Raspberry Pi devices running SQLite, applications that retry failed INSERT statements must reconcile idempotency across schema constraints and journal mode. The goal is to determine whether INSERT OR IGNORE alone, when a UNIQUE constraint is present, safely prevents duplicate rows during retries, or whether WAL mode checkpoint timing introduces visibility