SONOFF releases HTTP API for SPM-Main power meter

Sonoff power meter DIY Mode

SPM-Main is the main unit of Sonoff Smart Stackable Power Meter using RS485 to provide up to 128 relays. Besides support for the eWelink mobile app, we were promised an HTTP API at the time of the launch in September 2021. ITEAD kept its promises and has now released the HTTP API for the SPM-Main smart power meter to allow IoT home automation users and developers to control SONOFF devices via existing home automation open-source platform or local HTTP client. It’s the same REST API used for SONOFF MINI & R3 smart switches, but it adds support for power monitoring as well. The API allows you to switch between eWelink and DIY modes as needed, and provides the following functions: Device Status Broadcast – Returns the switch status of all channels with current, voltage, power, overload status, RS485 communication status, and more Get the List of Sub-device – List of […]

Smart Power 3 – A $45 smart power analysis tool for embedded systems developers

Smart Power 3

Hardkernel has launched a number of popular Arm SBC’s with the ODROID family over the years, but the Smart Power 3 is a different type of product, as the ESP32-based smart power meter can help embedded systems engineers optimize their hardware and software power consumption and/or check for spurious power peaks during boot up or shutdowns. In the past, we’ve reviewed relatively expansive tools like Qoitech Otii Arc or gone the DIY route,  but at $45, Hardkernel offers a power monitoring solution that’s both inexpensive and easy to use, albeit with fewer features than Qoitech’s device. Smart Power 3 specifications: MCU – ESP32 dual-core microcontroller via ESP32-WROOM-32E module Output Channels – 2x output channels (Max 50W + 50W) via 2x 4mm banana jacks each Output Voltage – 3V DC to input voltage – 1V Output Current – 3A max per channel Measurement Voltage, Current, Power Maximum sampling rate: 200Hz (5msec […]

WattUp 1W active energy harvesting developer kit enables at-a-distance wireless charging

WattUp 1W Active Energy Harvesting Transmitter

Two years ago, we noted Energous’ WattUp hearables developer kit that would charge earbuds with the company’s WattUp near-field wireless charging technology. The company has now introduced the WattUP 1W active energy harvesting developer kit capable of charging multiple IoT devices with at-a-distance wireless charging. The kit is said to be “active” because there’s a 6-inch transmitter, let’s call it a power gateway, and several IoT devices that harvest energy from it. Traditional passive solutions will harvest ambient energy from the surrounding environment, and may not deliver enough power, and do so unpredictably. The developer kit comes with the transmitter, plus one or more receiver units, and relies on the following main chips: Transmitter Dialog Semiconductor DA14682 SmartBond Bluetooth 5.0 Cortex-M0 SoC Dialog Semiconductor DA4100 Wireless Power Transmitter SoC Dialog Semiconductor DA3210 1W Power Amplifier A discrete rectifier and a DA2210 WPT rectifier Receiver(s) Dialog Semiconductor DA14531 Cortex-M0+ BLE 5.1 […]

SONOFF Smart Stackable Power Meter supports up to 128 20A relays

SPM RS485 daisy-chaining

ITEAD has introduced many smart switches over the year under the SONOFF brand, and their latest SONOFF Smart Stackable Power Meter is DIN mountable and made for larger industrial applications with up to 128 devices. The solution is comprised of the “SPM-Main” WiFi connected main unit controlling up to 32 “SPM-4Relay” units with 4 relays each using RS485 daisy-chaining. SPM-Main specifications: Storage – MicroSD card slot up to 32GB to store up to 180 days of energy usage data Connectivity Ethernet 2.4 GHz 802.11b/g/n WiFi 4 RS485 master Power Input – 100-240V 50/60Hz up to 50mA max Dimensions – 142.5 x 90 x 66.5 mm (PC V0 material) SPM-4Relay specifications: Connectivity – RS485 Power Input – 100-240V 50/60Hz up to 20A per relay, 80A total Power Output – 100-240V 50/60Hz up to 20A per relay, 80A total Safety – Current, voltage, and power overload protection with delay function from 0 […]

SmartBug smart switch integrates neatly into in-wall sockets (Crowdfunding)

SmartBug Smart Switch

SmartBug is a smart switch based on ESP32 wireless SoC, equipped with several sensors to measure temperature, humidity, power usage, and listen to sounds. It is designed to fit neatly into most in-wall sockets found around the world. Each SmartBug relies on mesh networking to communicate with each other and extend the range, WiFi for Internet connection, and Bluetooth low energy (BLE) to control additional devices without the need for any additional hub. SmartBug’s key features: MCU – 32-bit dual-core microcontroller with WiFi, wireless mesh, Bluetooth LE Connectivity 2.4GHz WiFI 4 Wireless mesh to let SmartBug act as a signal repeater Bluetooth 4.0 and BLE to control home appliances Audio Digital microphone for voices commands, baby crying (only enable if the plugin is downloaded in the app). Buzzer On-Off Relay up to 2200W, both AC and DC. Sensors – Temperature & humidity sensor, built-in power meter (current, voltage, and power) […]

NuCurrent showcases NFC charging at 3W, data rates up to 848 kb/s

NuevaNFC 3W power

The NFC Forum approved the Global Wireless Charging (WLC) specification last year with the new standard making it possible to wirelessly charge small, battery-powered consumer and IoT devices with a smartphone or other NFC charging device at a power transfer rate of up to one watt. The NFC WLC currently specifies power levels ranging from 100mW – 1W transmitted and data rates up to 106 kb/s, but NuCurrent claims to have gone beyond WLC specs, delivering over 3x more wireless power and over 8x faster data speeds. This was achieved with the company’s NuEva Development Platform for Near-Field Communication (NFC) Wireless Charging technology that provided up to 3W of power received (as opposed to just transmitted in the WLC specification) and data rates of up to 848 kb/s. NuCurrent expects the higher NFC charging power and data rates to enable new applications for small, space-constrained devices including wrist-wearables, smartwatches, styluses, […]

$5 board eases ATX power supply connection to single board computers

ZJ-012 ATX Power Supply single board computer

Many people have ATX power supplies from older desktop PCs that they may want to reuse with Arduino boards, Raspberry Pi, or other single board computers. It’s indeed possible to do so by trimming some cables and making a circuit to protect the board from over-voltage or over-current. But ZJ-012 adapter board offers a simpler solution with a 24-pin header for the ATX power supply, terminal blocks for connection to the target board, some fuses for protection, and a header to connect an on/off button. JZ-012 (also known as JZ-024) ATX power adapter board’s key features and specifications: Power Input – 20-pin or 24-pin computer ATX power supply Power output – 9-pin terminal block with +3.3V, +5V, -12V, +12V, +5V, GND with fuses for each power outputs On/Off control – Toggle switch or header for external button/switch (shorted for power on) Misc – Power indicator (red LED) Dimensions – 70 […]

Rockchip RK835 & RK837 fast charger chips support USB PD 3.0, QC4+, and VOOC

Rockchip is better known for its application processors for TV boxes (RK3328), Chromebooks and other higher-end hardware (RK3399), AIoT applications (RK3566), and more, but the company has recently introduced the RK83x family with RK835 and RK837 chips designed for fast chargers compatible with USB PD 3.0 and/or Qualcomm Quick Charge 4+ and BBK Electronics’ VOOC. RK835 Specifications MCU sub-system – Arm Cortex-M0 with 60KB flash, 1KB RAM USB PD 2.0/3.0 and PSS with TID number 4325 USB Type-C and Vconn power source Supports proprietary protocols 8-channel 10-bit, 500Hz converter speed ADC sensing voltage and 1-channel 10-bit current ADC All GPIOs can be configured as ADC input or edge triggering input DP/DM pins can be configured as UART, BC 1.2, or GPIO mode High-voltage endurance DP/DM and CC1/2 pins I2C interface with slave and master modes Low-power RC oscillator, 3 timers, one watchdog Discharge N-MOSFETs for VCC and VBUS Power – […]

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