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April 14, 2025

Pimoroni Presto – A Raspberry Pi RP2350-powered 4-inch wireless desktop touch display

Pimoroni Presto is a 4-inch desktop color touch display powered by a Raspberry Pi RP2350 microcontroller, and equipped with a Raspberry Pi RM2 wireless module for WiFi 4 and Bluetooth connectivity. The display comes with 16MB of SQPI flash and 8MB of PSRAM, seven RGB LEDs for ambient lighting, a microSD card slot, a piezo speaker, a Qwiic/STEMMA QT connector for expansion, a USB-C port for power and programming, and a 2-pin JST connector for an optional battery. Pimoroni Presto specifications: Microcontroller – Raspberry Pi RP2350B MCU CPU Dual-core Arm Cortex-M33 @150MHz with Arm Trustzone Dual-core 32-bit Hazard3 RISC-V @ 150MHz Up to two cores can be used at the same time Memory – 520KB SRAM Package – QFN-80; 10×10 mm Memory – 8MB PSRAM Storage 16MB QSPI flash MicroSD card slot Display – 4-inch square IPS LCD screen with 480 x 480 resolution, capacitive touchscreen Wireless – Raspberry Pi […]

April 13, 2025April 14, 2025

Battery-powered Seeed Studio IoT Button features ESP32-C6 SoC, supports ESPHome or Zigbee firmware

Seeed Studio IoT Button is an inexpensive ESP32-C6 button powered by a rechargeable 18650 battery and designed to easily and quickly control Smart Home devices over WiFi 6 or Zigbee wireless protocol. It will be especially handy to Home Assistant users since the device is pre-flashed with ESPHome firmware for easy integration (over WiFi), and the company also provides a Zigbee firmware for Zigbee Home Assistant (ZHA) integration. The hardware is pretty basic with a button, three LEDs, and a USB-C port for charging the replaceable 18650 battery. Seeed Studio IoT Button specifications: SoC – ESP32-C6FH4 CPU Single-core 32-bit RISC-V clocked up to 160 MHz Low-power RISC-V core @ up to 20 MHz Memory – 512KB SRAM, 16KB low-power SRAM Storage – 320KB ROM, 4MB flash Wireless – 2.4 GHz WiFi 6, Bluetooth 5.0 LE/Mesh (somehow not used here), 802.15.4 radio for Zigbee 3.0 and Thread. Matter compatible. USB – […]

April 11, 2025April 11, 2025

T-Pico-2350 is a fully integrated devkit with Raspberry Pi RP2350, ESP32-C6, 2.33-inch color touchscreen display, and HDMI video output

LILYGO T-Pico-2350, also called the T-Pico2, is a fully enclosed devkit based on Raspberry Pi RP2350 MCU, an ESP32-C6 SoC for wireless connectivity, a 2.33-inch capacitive color touchscreen display, and an HDMI (DVI) video output port. The design is an update to the T-PicoC3 introduced in 2022 with the case design of the T-Display S3 Pro, and the devkit also features a microSD card slot, a USB-C port for power and programming, two GPIO headers, a 13-pin GPIO FPC connector, two Qwiic I2C/UART connectors, and a PMU for battery management. T-Pico-2350 specifications: Microcontroller – Raspberry Pi RP2350A CPU Dual-core Arm Cortex-M33 @ 150 MHz with Arm Trustzone, Secure boot OR Dual-core RISC-V Hazard3 @ 150 MHz Up to two cores can be used in any combination Memory – 520 KB on-chip SRAM Storage 16MB SPI flash connected to RP2350 MicroSD card slot Display – 2.33-inch color IPS LCD (ST7796S SPI […]

April 4, 2025

LILYGO T-Watch S3 Plus smartwatch gets GPS and 940mAh battery

LILYGO has recently introduced the T-Watch S3 Plus, an ESP32-S3 smartwatch which can be considered an upgrade from the previous generation T-Watch S3, adding a u-blox MIA-M10Q GPS and a larger 940mAh LiPo battery for extended battery life. The T-Watch S3 Plus smartwatch still supports Wi-Fi, Bluetooth LE, and LoRa connectivity, and integrates a 1.54-inch 16-bit full-color TFT LCD display with capacitive touch and a wide-viewing angle. The smartwatch also features an infrared (IR) transmitter that can be used for remote control or proximity detection. T-Watch S3 Plus specifications Wireless MCU – Espressif Systems ESP32-S3 CPU – Dual-Core 32-bit Tensilica LX7 @ up to 240 MHz with vector instructions for AI/ML acceleration Memory – 512KB SRAM, 8MB PSRAM Storage – 16MB flash, 384KB ROM Wireless – Wi-Fi 4 and Bluetooth 5 LE/Mesh Display – 1.54-inch 16-bit full color TFT LCD display with 240×240 resolution, capacitive touch; ST7789V SPI controller Audio – […]

LoRa Voice Communication Kit Walkie Talkie

March 28, 2025

A LoRa-based Walkie-Talkie? Meet LILYGO T3-S3 MVSR LoRa voice communication kit

With its low-power, long-range capabilities, LoRa has been used for P2P and Mesh messaging with firmware like MeshTastic, but due to its limited bandwidth, we haven’t seen quite as many LoRa audio applications. This has not stopped LILYGO from designing the T3-S3 MVSR LoRa voice communication kit, integrating LoRa radio, a microphone, and a speaker to use the board as a walkie-talkie solution working over Semtech SX1262 or SX1280 RF transceiver. LILYGO T3-S3 MVSR specifications: SoC – Espressif Systems ESP32-S3FH4R2 CPU – Dual-core Tensilica LX7 microcontroller @ up to 240 MHz Wireless – 2.4 GHz 802.11n WiFi 4 and Bluetooth 5.0 LE connectivity Memory – 2MB PSRAM Storage – 4MB SPI flash Storage – MicroSD card slot Display – 0.96-inch 128×64 OLED display with SSD1306 I2C driver Audio MAX98357A Speaker MSM261S4030HOR Microphone LoRa module (one or the other) LORA32 SX1262 with 868MHz or 915 MHz radio LoRa 2.4G module based […]

March 24, 2025

SparkFun IoT RedBoard – Raspberry Pi RP2350 or ESP32 WiFi & Bluetooth boards with Arduino UNO R4 form factor

SparkFun has just launched the “IoT RedBoard – RP2350” and “IoT RedBoard – ESP32” boards with Arduino UNO R4 form factor based on respectively Raspberry Pi RP2350B + RM2 wireless module and ESP32-WROOM-32E WiFi and Bluetooth module. Both boards feature Arduino UNO headers and a Qwiic connector for expansion, a microSD card for storage, battery support, USB and DC jack power input, plus a few buttons and LEDs. The RP2350 board also adds an HSTX connector mainly useful for controlling HDMI or SPI displays. Sparkfun IoT RedBoard specifications: MCU sub-system and wireless RP2350 model MCU – Raspberry Pi RP2350B CPU Dual-core Arm Cortex-M33 @ 150 MHz with Arm Trust zone, Secure boot Dual-core RISC-V Hazard3 @ 150 MHz Up to two cores can be used at any given time Memory – 520 KB on-chip SRAM Memory – 8MB PSRAM Storage – 16MB Flash Wireless module – Raspberry Pi RM2 2.4 […]

March 17, 2025December 26, 2025

M5Stack Unit Gateway H2 – A tiny ESP32-H2 Thread/Zigbee gateway selling for $6.50

M5Stack’s Unit Gateway H2 is a small Thread/Zigbee gateway powered by the ESP32-H2-MINI-1 module with an 802.15.4 radio for Zigbee 3.0, Thread 1.3, and Matter connectivity. The Unit Gateway H2, also known as Gateway H2 Unit…, can operate as a gateway (e.g. a Thread Board Router) or a terminal device that communicates with an M5Stack device via serial/UART through the Grove interface. It also features a USB-C port for power, firmware flash, and debugging. M5Stack says it’s suitable for smart homes, environmental monitoring, sensor networks, and low-power wireless communication nodes. M5Stack Gateway H2 Unit specifications: Wireless module – ESP32-H2-MINI-1-N2 SoC – Espressif Systems ESP32-H2 CPU – 32-bit RISC-V SoC clocked at up to 96 MHz RAM and storage – 320 KB SRAM, 128 KB ROM, 4 KB LP memory Wireless – 802.15.4 radio with Zigbee 3.0, Thread 1.3, and Matter support. (Note: the ESP32-H2 also supports Bluetooth 5.2 LE/Mesh, but […]

March 14, 2025

UNIHIKER K10 low-cost TinyML education platform supports image detection and voice recognition

UNIHIKER K10 is a low-cost STEM education platform for TinyML applications that leverages the ESP32-S3 wireless microcontroller with vector extensions for workloads such as image detection or voice recognition. The UNIHIKER K10 also features a built-in 2.8-inch color display, a camera, a speaker, a 2-microphone array, a few sensors, a microSD card, and a BBC Micro:bit-like edge connector for power signals and GPIOs. It’s a cost-optimized version of its Linux-based big brother – the UNIHIKER M10 – first unveiled in 2022. Arnon also reviewed the UNIHIKER in 2023, showing how to configure it, use the SIoT platform with MQTT message, and program it with Jupyter Notebook, Python, or Visual Studio Code. Let’s have a closer look at the new ESP32-S3 variant. UNIHIKER K10 specifications: Core module – ESP32-S3-WROOM-1 MCU – ESP32-S3N16R8 dual-core Tensilica LX7 up to 240 MHz with 512KB SRAM, 8MB PSRAM, 16MB flash Wireless – WiFi 4 and […]