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July 26, 2025 by Debashis Das - No Comments

PD.Charger-GSM v2.5 – An industrial solar MPPT charger with Wi-Fi, LTE/GPS, and RS485

rotoDevs GmbH PD.Charger GSM v.2.5 industrial solar MPPT charger

The PD.Charger-GSM v2.5 is an industrial-grade solar and LiFePo4 charger/controller with MPPT support, designed for 2–4 cell Li-Ion/LiFePo4 batteries. With various connectivity options and a cryptographic co-processor, it’s ideal for IoT, remote solar power systems, and battery-powered industrial applications. The device features a dual-MCU architecture where the STM32 handles battery charging and monitoring, and an ESP32 manages WiFi and Bluetooth connectivity, as well as LTE/NB-IoT GSM/GPS, and RS-485 with ModBUS support. The board also offers two solar inputs with MPPT, a DC adapter input, automatic buck/boost control, SMA connectors for all RF interfaces, a USB Type-C for programming, and expansion headers for prototyping. A hardware crypto co-processor handles secure key storage, TLS encryption, and secure boot. PD.Charger-GSM v2.5 specifications: SoCs STM32L051xx MCU for battery management and monitoring ESP32-D0WDQ6-V3 dual-core Xtensa LX6 processor, 240 MHz, 16MB Flash, 8MB PSRAM Display – Supports optional PD.Screen / PD.Screen_PRO modules for real-time display of […]

July 25, 2025July 25, 2025 by Debashis Das - No Comments

L76K GPS Raspberry Pi HAT supports GPS, BeiDou, GLONASS, QZSS, and A-GNSS

Waveshare has recently introduced the L76K GPS HAT, a Raspberry Pi-compatible HAT that supports multiple GNSS systems, including GPS, BeiDou, GLONASS, QZSS, and AGNSS for accurate location tracking and navigation. The HAT also supports a low-noise amplifier (LNA) for improved reception, a SAW filter for noise reduction, and offers fast TTFF with a cold start time of 30 seconds and a hot start of just 2 seconds. Communication is done via UART, and the module supports a maximum update rate of up to 5Hz. Powered by a 5V supply, it consumes less than 55mA. On top of that, there is an onboard battery holder that preserves ephemeris data for quicker fixes. L76K GPS HAT specifications: Compatibility Raspberry Pi Model A, Model B, Zero, and other compatible SBCs with a 40-pin Raspberry Pi GPIO header Devices with a USB port GNSS Module – Quectel GNSS L76 module with AT6558R chipset Receiver […]

July 20, 2025July 20, 2025 by Jean-Luc Aufranc (CNXSoft) - 4 Comments

OMBAR DC42 Dash Cam Review – A 4K+1080p dash cam with dual-band WiFi and GPS

We’ve been sent the OMBAR DC42 Dash Cam for review. It’s a car dash cam kit with a 4K UHD front camera and a 1080p FHD rear camera, each with a wide F1.8 aperture that allows more light for clear images day and night. The kit ships with a 64GB microSD card and supports cards with up to 256GB capacity. The distraction-free, screenless camera supports dual-band (2.4 + 5GHz) WiFi connectivity, GPS location recording to show driving routes, voice guidance, and in-car audio recording. The dash cam also includes accident detection with a G-sensor and a 24-hour parking mode, but the latter requires the optional OMBAR 3-lead hard-wire kit, which sadly was not included in our kit. In this review, we will start with the specifications of the OMBAR 42 dash car, go through an unboxing, report our experience installing the cameras in our car (spoiler: it’s much easier than […]

June 14, 2025 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

Valtrack V4 is a programmable 4G LTE GPS vehicle tracker with ESP32-C3 Bluetooth & Wi-Fi SoC (Crowdfunding)

Valetron Systems VALTRACK-V4-VTS-ESP32-C3 (or Valtrack V4 for short) is a 4G LTE GPS vehicle tracker based on ESP32-C3 WiFi and Bluetooth SoC and a SIMCom SIM7672 cellular and GNSS module. Designed to track bicycles, cars, or trucks, the Valtrack V4 GPS tracker is housed in an IP67 waterproof enclosure, takes 12V to 42V DC input from a lead battery or 3.7-4.2V from a backup LiPo or Li-Ion battery, and features an accelerometer to wake up when motion is detected or detect theft, as well as three RGB LEDs for status. Valtrack V4 specifications: Wireless MCU – Espressif ESP32-C3FH4 CPU – 32-bit RISC-V microcontroller @ up to 160 MHz; Memory – 400 KB SRAM Storage – 4 MB flash Wireless – 2.4 GHz Wi-Fi 4 & Bluetooth 5.0 Cellular and GNSS connectivity SIM7672G 4G LTE Cat 1 module with Global LTE band, 2G fallback, and GNSS support Nano SIM card […]

June 2, 2025 by Debashis Das - No Comments

u-blox ZED-F20P triple-band GNSS module provides 25Hz RTK/PPP-RTK with centimeter accuracy for drones and robots

The u-blox ZED-F20P is a high-precision, triple-band GNSS module designed for fast-scaling applications, such as drones, ground robots, and other dynamic platforms. It supports L1/L2/L5 bands and delivers centimeter-level accuracy using RTK and PPP-RTK correction methods. Designed for low power consumption and fast convergence, the ZED-F20P operates at 25 Hz and integrates various security features, making it suitable for lightweight and mobile platforms. It is fully compatible with the existing ZED module footprint and UBX protocol, allowing easy integration and upgrade paths within the ZED portfolio. The module works with the ANN-MB2 all-band antenna and supports u-blox’s PointPerfect Flex and Live correction services, offering rapid, base station–free accuracy in challenging environments. These features make this suitable for applications like robotic lawnmowers and autonomous aerial systems. u-blox ZED-F20P specifications: Storage – Internal Flash for firmware GNSS receiver u-blox F20 engine (672-channel) GPS – L1C/A, L2C, L5 QZSS – L1C/A, L1C/B*, L2C, […]

May 31, 2025May 31, 2025 by Debashis Das - No Comments

Wio Tracker L1 Pro is a battery-powered, ready-to-use Meshtastic LoRa node

Wio Tracker L1 Pro LoRa based off grid messaging device

The Wio Tracker L1 Pro is a battery-powered LoRa node pre-flashed with the Meshtastic firmware for low-power off-grid messaging and GPS coordinates sharing. It integrates a Semtech SX1262 LoRa module for wireless data transmission and uses a Nordic nRF52840 Bluetooth 5.0 SoC to process and display the data. The L1 Pro also features a 1.3-inch OLED display, a rechargeable battery, a USB Type-C port, and a solar panel connector housed in a durable 3D-printed enclosure. It is fully compatible with the Grove ecosystem and offers expansion via PTH headers and an SWD interface. Wio Tracker L1 Pro specifications: SoC – Nordic Semiconductor nRF52840 CPU – 32-bit Arm Cortex-M4F microcontroller @ 64 MHz Memory & storage – 1 MB Flash, 256 KB RAM Wireless – Bluetooth 5, Thread, ANT, Bluetooth Mesh, 802.15.4 (Zigbee), 2.4 GHz proprietary Display 1.3-inch OLED display with 64 x 28 resolution Active Area – 34.5mm x 23.0mm x 1.47mm […]

May 5, 2025 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

KSTR-IMX93 single board computer pairs NXP i.MX 93 SoC with Nordic Semi nRF5340, nRF9151, and nRF7002 wireless chips

Conclusive Engineering KSTR-IMX93 is a single board computer (SBC) powered by an NXP i.MX 93 Cortex-A55/M33 AI SoC and equipped with three Nordic Semi wireless solutions, namely nRF5340 SoC, nRF9151 SiP, and nRF7002 WiFi 6 coprocessor. This allows the board to offer a wide range of wireless and wired connectivity options with Gigabit Ethernet, dual-band WiFi 6, Bluetooth 5.4 LE, Zigbee, Thread, NB-IoT, LTE Cat-M1, and GNSS. In some way, the KSTR-IMX93 is the equivalent of combining a Nordic Thingy:91 X Cellular IoT development platform with an Arm Linux SBC. KSTR-IMX93 specifications: SoC – NXP i.MX 93 CPU Single or dual-core Arm Cortex-A55 up to 1.7 GHz Arm Cortex-M33 up to 250 MHz GPU – PXP 2D GPU with blending/composition, resize, color space conversion NPU – Arm Ethos-U65 NPU @ 1 GHz up to 0.5 TOPS Memory – 640 KB OCRAM w/ ECC Security – EdgeLock Secure Enclave System Memory […]

April 25, 2025 by Jean-Luc Aufranc (CNXSoft) - No Comments

LILYGO T-Echo Lite – A 1.22-inch e-Paper display board with nRF52840 SoC, LoRa transceiver, GPS

LILYGO T-Echo Lite is a small Nordic Semi nRF52840 board with a 1.22-inch e-Paper display, a Semtech SX1262 LoRa transceiver, and an L76K GPS module, that’s especially suitable for Meshtastic off-grid messaging firmware. It looks like it could even serve as the base for a Meshtastic watch. The T-Echo Lite is a lightweight version of the earlier T-Echo that ships with a larger 1.54-inch e-paper display. Three Lite versions are available: T-Echo Lite Core – Castellated module with nRF52840, LoRa, power, and battery management T-Echo Lite Base – A breakout board for the Core module with battery and solar panel connectors, Qwiic connector, USB port, an interface for a 1.22-inch e-paper display, and an optional GPS expansion header T-Echo Lite Main Unit – Complete solution built around the Base version, a 1.22-inch e-paper display, and an acrylic enclosure. The L76K GPS module is still an option. T-Echo Lite specifications: LILYGO […]