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Sonoff Pow is a $10.50 ESP8266 WiFi Relay Box that also Measures Power Consumption

In a recent article about Sonoff TH10/TH16 WiFi relays with sensor probes support, we also saw that ITEAD Studio started to have a nice family of home automation products. The company has now added one more item to the Sonoff family with Sonoff Pow support up to 16A/3500W input, and the first to also include power consumption measurements. Sonoff Pow specifications: SoC – Espressif ESP8266 Tensila L106 32-bit MCU up to 80/160 MHz with WiFi Connectivity – 802.11 b/g/n WiFi with WPA/WPA2 support Relay – HF152F-T relay with 90 to 250 VAC input, up to 16A (3500 Watts) Terminals – 6 terminal for mains and load’s ground, live and neutral signals. Programming – Unpopulated 4-pin header for flashing external firmware Misc – LEDs for power and WiFi status, power consumption circuitry with 1% accuracy. Dimensions – 114 x 52 x 32mm Temperature range – -40 ℃ to 125 ℃ The […]

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What’s the Cheapest MCU? My Try: Holtek HT48R002 8-bit MCU Selling for $0.085

Somebody asked what was the cheapest MCU (Microcontroller) available on Google+, so I thought it would be fun to find the cheapest one regardless of specifications. It turns out there an older thread with this very question on StackExchange, and at the time (2011) Microchip PIC10F200 8-bit MCU with 256B RAM in SOP-23 package was the cheapest one among the answer, and somehow the price has not changed as it’s still $0.32 per unit for 1k orders. Not a bad price, but back in the days when I wrote on CD and DVD players, we had some price pressure from customers, so we looked for a cheaper microcontroller, and ended up using Holtek because of the competitive pricing. We suffered a bit during development due to incomplete documentation but eventually did the job. Anyway, I went to the Holtek website and found a “cost-effective I/O MCU” category, and HT48R002 appears […]

Khadas Edge2 Arm mini PC
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Dragino LoRa/GPS HAT Board for Raspberry Pi Sells for $32

There are several ways to play with LoRaWAN protocol on the Raspberry Pi including RisingHF Discovery kit or Cooking Hacks LoRa Shield for Raspberry Pi, but the latter requires you to spend close to $100 just for the shield, the complete Lora discovery kit costs close to $400. Dragino Tech LoRa/GPS HAT board should be a more cost effective way to get started with LoRa on Raspberry Pi, as it sells for $32 + shipping on Tindie. Dragino LoRa/GPS HAT specifications: Connectivity LoRa Semtech SX1276/SX1278 transceiver @ 433/868, or 915 MHz (Country dependent, pre-configured in the factory) 168 dB maximum link budget. +20 dBm – 100 mW constant RF output vs. +14 dBm high efficiency PA. Programmable bit rate up to 300 kbps. GPS L80 GPS module based on Mediatek MT3339 SoC Horizontal Position Accuracy: autonomous <2.5 m CEP. TTFF@-130dBm with EASY (AGPS): Cold Start <15s,Warm Start <5s,Hot start <1s; […]

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What’s the Best Android TV Box?

[Update December 26, 2017: I’ve posted a new version of this post entitled “What’s the Best Android TV Box (2017/2018 Edition)?“. I’ll leave the post below to have an historical perspective] I often get asked which TV box to buy, or what the best Android TV box is, and the answer is the TV box that fits your needs for the lowest price point possible. Considering there are around 2 millions apps for Android, they are multitudes of use cases, and you can’t provide a single answer for everybody. So I’ll provide a list of things to look for beside the processor, and three TV boxes that I think are worth considering, before providing alternatives for people who want cheaper devices. Things to Look for There are still a few things you may want to specifically look for before purchasing an Android TV box: History of regular firmware updates – […]

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Doogee P1 is a Tiny Android 4.4 DLP Projector That Supports Screen Mirroring and Extension over WiFi

Doogee Smart Cube P1 looks like a colorful Android 4.4 TV box powered by an Amlogic quad core processor, but it’s actually an Android DLP projector without other video output ports (no HDMI, no composite) that can also be used to mirror or extent your laptop or smartphone screen. Doogee P1 specifications: SoC – Amlogic quad core processor (likely Amlogic S805 quad core Cortex A5 since the device is running Android 4.4) System memory – 1GB DDR3 Storage – 8GB eMMC flash Projector Texas Instrument DLP with 70 lumen/3W brightness, OSRAM LED, and 30,000 hours LED lifetime Resolution – 854×480; max: 1280×720 Contrast ratio – 800:1 Manual focus Audio – 2x 1.2W speakers Connectivity – 802.11 b/g/n and Bluetooth USB – 1x USB 2.0 host port, 1x micro USB OTG port Misc – Dual LED charging LED, power and reset buttons Power Supply – 5V via USB OTG port Battery […]

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Android, Chromium OS, and Ubuntu on Intel Atom x5 Compute Stick. What Works, What Doesn’t.

The latest “STK1AW32SC” Intel Compute Stick, also called Sterling City, is powered by an Intel Atom x5-Z8300 processor with 2GB RAM and 32GB storage, and pre-loaded with Windows 10. There’s also a version with operating systems dubbed STK1A32SC, but currently only the Windows version is available on Amazon US. That doesn’t not mean you can’t try to install other operating systems on the TV stick, and that’s exactly what Ian Morrison has done with Android 4.4 & 5.1, Phoenix OS, Remix OS (alpha), Chromium OS, and Ubuntu.   If you want to know how to install the operating systems, you can follow the instructions for Ubuntu , Chromium OS, or Android/ Remix OS/ Phoenix OS. Bear in mind that installing Android also require that you install Ubuntu first, and there are quite a lot of steps, and once you’ve installed Chromium OS, you could also run Ubuntu using Crouton. So […]

Rockchip RK3568/RK3588 and Intel x86 SBCs
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Loon Copter is a Drone that Flies, Floats and Dives Underwater

Most drones simply fly, while some robots can dive underwater, but Loon Copter, a project by Oakland University’s Embedded Systems Research Laboratory, can fly, float on the water, and dive underwater just like a duck, hence its name. I could not find much technical details about the drone, but since I discovered it via Atmel on Google+, I assume some soon-to-be Microchip AVR MCUs might be involved. It flies like any quadcopter, then it can land on water and move sideways with the blades rotating in the air. The submerged mode is interesting. The drone fills itself with water until the blades are under water, and then rotates 90 degrees to roam in the water. Once it’s done it ejects the water to get back to the surface. The drone is also equipped with camera and sensors to explore its surroundings. Some potential applications include underwater survey of corals or […]

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This is What a 16 Raspberry Pi Zero Cluster Board Looks Like

Idein, a Japanese startup, has been working with a Raspberry Pi compute module to create Actbulb, a multi-functional device for applications using computational sensing and data analysis, and that fits in a regular light bulb socket. But for their internal testing, they’ve decided to create a cluster for 16 Raspberry Pi Zero boards. PiZero Cluster board has 32 micro USB ports for power and data, two for each Raspberry Pi Zero board, 16 USB type A ports, and 16 Ethernet interfaces. They’ve likely done this board for testing their ActBulb, as Koichi Nakamura, Idein CEO & founder mentioned that: We are making a sensing device that uses Raspberry Pi compute module. So we need many Pi’s for the development and tests. Since we will use Pi’s GPU for image processing, deep learning, etc. We need real Pis but not just Linux machines. Another reason. It can be used for flashing […]

Khadas VIM4 SBC