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May 22, 2025 by Jean-Luc Aufranc (CNXSoft) - No Comments

Silicon Labs SiXG301 and SiXG302 “Series 3” wireless SoCs are built for line-powered and battery-powered IoT applications

Silicon Labs SiMG301 Series 3 wireless SoC

Silicon Labs has just introduced the first 22nm Series 3 SoCs with the SiXG301 and SiXG302 Arm Cortex-M33 multiprotocol wireless SoCs designed for line-powered and battery-powered IoT devices, respectively. The SiXG301 is offered with 4MB flash and 512 KB SRAM, embeds an LED pre-driver for advanced LED smart lighting and smart home products, and supports 2.4 GHz wireless protocols such as Bluetooth, Zigbee, and Thread with support for Matter. The upcoming SiXG302 Bluetooth and Matter SoC offers an ultra-low-power consumption using only 15 µA/MHz active current, or 30% lower than competitive devices in its class, and as such is ideal for battery-powered wireless sensors and actuators. We’ll be focusing on the SiMG301 multi-protocol SoC and SiBG301 Bluetooth LE SoC in this article since the details are sparse for the SiXG302 parts (SiMG302 and SiBG302). Silicon Labs SiMG301 / SiBG301 specifications: MCU Core – 32-bit Arm Cortex-M33 with DSP instructions and […]

May 21, 2025 by Debashis Das - No Comments

Adafruit Sparkle Motion Stick – A compact ESP32-S3 USB WLED controller board with dual 5V LED outputs, an I2S Mic, and a snap-fit enclosure

Adafruit Sparkle Motion Stick + Enclosure Kit

Adafruit has recently released the Adafruit Sparkle Motion Stick, a compact, WLED-friendly Neopixel USB controller board built around an ESP32-S3 Module designed for audio-reactive LED projects, cosplay props, holiday lighting, and more. The module comes with a USB Type-A port for programming and power input (5V, 2A max), and a simple enclosure for protection (not weatherproof). It includes a built-in I2S microphone for audio-reactive effects, an IR receiver for remote control. Other than that it has a user-programmable button, an onboard NeoPixel LED, and a red status LED with two 5V-level shifted signal outputs with power and to connect the LEDs a screw terminal blocks. Adafruit Sparkle Motion Stick specifications SoC – ESP32-S3 dual-core Xtensa LX7 MCU @ 240MHz with 2.4GHz Wi-Fi and BLE 5 LED Control – 2x level-shifted output channels (5V logic) with terminal blocks (26–20AWG support) Audio Input – Built-in I2S MEMS digital microphone for audio-reactive lighting Infrared […]

May 14, 2025May 14, 2025 by Jean-Luc Aufranc (CNXSoft) - 2 Comments

SiFli SF32LB52J big.LITTLE Arm Cortex-M33 Bluetooth MCU powers the Core Time 2 smartwatch

SiFli SF23LB52J is a Bluetooth 5.3 microcontroller part of the SF32LB52x family with two Cortex-M33 in big.LITTLE configuration with a 240 MHz high-performance core for user application/GUI and a 24 MHz low-power core to manage the Bluetooth part. A few months ago, Eric Migicovsky, the founder of the smartwatch company Pebble, and now Core Devices, introduced the Core 2 Duo and Core Time 2 smartwatches running PebbleOS open-source firmware that were mostly relaunches of the never-released Pebble 2 and Pebble Time 2 with some tweaks. We already knew the Core 2 Duo would be based on a Nordic nRF52840 Arm Cortex-M4F microcontroller, however, the one for the Core Time 2 was kept secret. That’s until today, as Eric has just announced that the Core Time 2 would be based on the SiFli SF23LB52J MCU, since the smartwatch required an MCU with more RAM and processing power, and SiFli also offers […]

May 8, 2025May 8, 2025 by Jean-Luc Aufranc (CNXSoft) - No Comments

Bluetooth 6.1 specification introduces randomized RPA updates for enhanced privacy and power efficiency

The Bluetooth Special Interest Group (SIG) has just adopted the Bluetooth 6.1 Core Specification with the addition of the randomized Resolvable Private Address (RPA) Updates feature and several errata. The Randomized RPA updates feature is designed to enhance privacy and power efficiency in Bluetooth devices by randomizing the timing of address changes to make it much more difficult for third parties to track or correlate device activity over time, and offloading the address change operation to the Controller to help the Bluetooth device extend its battery life. That’s about all there is for Bluetooth 6.1, except some errata like “Pause Encryption should be mandatory to support with encryption”. You’ll find the latest specification on the Bluetooth website, as well as a page specific to Randomized RPA Updates. None of the usual silicon vendors like Silicon Labs, Nordic Semi, or NXP have announced any updates to Bluetooth 6.1. One of the […]

May 1, 2025 by Debashis Das - 2 Comments

Adafruit Sparkle Motion – An ESP32-based addressable LED controller with four outputs, 100W USB-C power, and WLED/xLights support

The Adafruit Sparkle Motion is an ESP32-based LED controller board designed to drive addressable LEDs, including WS2812B, APA102, SK6812, LPD8806, UCS2904, and SM16704. It supports both WLED and xLights projects and features an onboard 100W USB-C PD port to drive even high-voltage LED setups. The board includes dual power input options (USB-C PD with 5/12/20V selection and 2.1mm DC jack), a 5A fuse, and level-shifted output terminals for controlling addressable LEDs. The board also features a built-in I2S digital microphone, IR receiver, Stemma QT I2C port, USB-serial with auto-reset, GPIO breakout pads, onboard NeoPixel and status LED, and multiple JST and terminal connectors for sensor and control integration. It comes pre-assembled with terminal blocks for easy wiring, making it suitable for applications such as wearable electronics, home decor lighting, audio-reactive displays, and remote-controlled installations. Adafruit Sparkle Motion Specifications: SoC – ESP32-S3 dual-core Xtensa LX7 MCU @ 240MHz with 2.4GHz Wi-Fi and […]

April 23, 2025April 23, 2025 by Jean-Luc Aufranc (CNXSoft) - No Comments

SPARK Microsystems SR1120 UWB ultra-low-power transceiver delivers up to 41 Mbps throughput

SPARK Microsystems SR1120 is the company’s second-generation ultra-wideband (UWB) wireless transceiver capable of up to 41 Mbps throughput at ultra-low power and up to 100 times lower power ranging than UWB competitors. The Canadian company also highlights the outperformance of their UWB solution over Bluetooth with the new SR1120 offering 40 times higher data rates than Bluetooth chips, while consuming 25 times less power than Bluetooth and offering 60 times lower latency. However, readers should note that Bluetooth LE is supposed to support up to 2 Mbps, so it should (only) be up to about 20 times faster, and Bluetooth HDT is coming soon with data rates of up to 7.5 Mbps to further narrow the gap. SPARK SR1120 key features and specifications: Compliant with the upcoming IEEE 802.15.4ab low-energy UWB PHY standard Dynamically reconfigurable UWB spectrum 6.2–9.5 GHz band Up to 3 dBm TX power RX sensitivity of -81 […]

April 9, 2025April 10, 2025 by Jean-Luc Aufranc (CNXSoft) - 14 Comments

Antenna hack more than doubles the range of cheap ESP32-C3 USB-C boards

There are plenty of small ESP32-C3 IoT boards with a USB-C connector on the market, and while they all look very similar, antenna designs differ, and less thought-out ones may severely impact the WiFi and Bluetooth range. Peter Neufeld decided to hack one of those cheap ESP32-C3 boards by adding a custom antenna, and this resulted in the board having more than twice the range and almost three times in some cases. Those tiny boards are cramped, so there’s very little space around the ceramic antenna typically used, leading to poor RF performance. To work around that issue, Peter added a 31mm long antenna made of silver-plated wire, making a loop of about 8mm in diameter outside of the board and soldered on the ceramic antenna’s solder joints, and the rest of the wire (about 15mm) points upwards. As you can see from the photo above, he didn’t remove the […]

March 24, 2025 by Jean-Luc Aufranc (CNXSoft) - 6 Comments

Shelly launches Gen4 multi-protocol smart switch family with Wi-Fi, Bluetooth, Zigbee, and Matter

Shelly Group has just launched its Gen4 multi-protocol smart switch family supporting Wi-Fi, Bluetooth, Zigbee, and Matter protocols for the Smart Home. The company specifically introduced five new products: the Shelly 1 Gen4 one-channel, dry contact smart switch, the Shelly 1PM Gen4 smart switch with power monitoring, Shelly 1 Mini Gen4 compact smart switch for lights and small appliances, the Shelly 1PM Mini Gen4 compact smart switch with power metering, and the upcoming Shelly EM Mini Gen4 energy meter. Let’s have a quick at each product. Shelly 1 Gen4 smart switch Shelly 1 Gen4 specifications: Wireless SoC – ESP-Shelly-C68F Based on ESP32-C6 RISC-V SoC Storage – 8MB flash Wireless – 2.4 GHz WiFi 6, Bluetooth 4.2, and 802.15.4 radio for Zigbee and Matter Wireless parameters WiFi 6 Max. RF power – < 20 dBm Range – Up to 30m indoors, 50m outdoors Bluetooth 4.2 Max. RF power – < 4 […]