Report: Most DS18B20 Temperature Sensors Sold Online are Fakes or Counterfeit Parts

Authentic DS18B20 chip

We’ve already covered counterfeit components with a method to detect STM32 fakes,  and several years ago, FTDI decided to take action by bricking clones of their USB to serial chips, although they’ve fairly quickly reversed course following the backlash. But Chris Petrich decided to look at another type of component: Maxim Integrated DS18B20 temperature sensor often found in waterproof temperature probes. His team bought over 1000 waterproof probes or bare chips from more than 70 different vendors on eBay, AliExpress, and online stores in 2019, and found the vast majority to be fake, counterfeit, or clones. So if you have such sensor not quite working as expected, you likely bought a clone as some of the counterfeit sensors do not work in parasitic power mode, have a high noise level, a temperature offset outside the advertised ±0.5 °C band, do not contain an EEPROM, have bugs and unspecified failure rates. One way to find whether you have such fake DS18B20 …

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nRF52805 Tiny Bluetooth 5.2 SoC is Optimized for Small Two-layer PCB Designs

nRF52805 Block Diagram

Nordic Semi has just added a new member to its nRF52 Bluetooth 5 wireless SoC family with nRF52805 offered in a tiny WLCSP package measuring 2.48×2.46 mm and optimized for cost-effective 2-layer PCB designs. nRF52805 key features and specifications: MCU Core – Arm Cortex-M4 @ 64 MHz Storage & Memory – 192 KB Flash, 24 KB RAM Wireless Bluetooth Low Energy and 2.4 GHz proprietary protocols. High bitrate – 2 Mbps, 1 Mbps +4 dBm TX power -97 dBm RX sensitivity (1 Mbps Bluetooth LE) Integrated balun with single-ended output I/Os – UART, SPI, TWI, 2-channel 12-bit ADC Security 128-bit AES Power Consumption 7 mA in TX (4 dBm) 4.6 mA in TX (0 dBm) 4.6 mA in RX (1 Mbps) 0.3 μA in System OFF 1.1 μA in System ON with 24 KB RAM retained and RTC running Supply Voltage – 3.6V max Package – 2.48×2.46 mm WLCSP Note the latest Nordic Semi wireless SoC does not support all …

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STM32 based Indoor Air Quality Sensor Connects to Raspberry Pi or Arduino (Crowdfunding)

Indoor Air Quality Sensor Raspberry Pi Arduino

Even before the COVID-19 lockdown, people spent most of their time indoors (around 90% according to some studies), so it’s important to monitor air quality and other metrics like light and sound levels in our homes, workplaces, schools, cars, etc… Metriful Sense indoor environment monitor does just that by reporting multiple metrics such as temperature, humidity, particle concentration, etc… over I2C to microcontroller or processor boards such as Arduino or Raspberry Pi. Sense hardware specifications: MCU – STMicro STM32G071KB Arm Cortex-M0+ microcontroller @ 64 MHz with 128 KB Flash, 36 KB SRAM Sensors Bosch Sensortec BME680 4-in-1 air quality sensor with relative humidity, barometric pressure, ambient temperature, and gas (VOC). Vishay VEML6030 ambient light sensor Knowles SPH0645LM4H-B MEMS microphone Optional – Shinyei PPD42 particle sensor unit I/Os – 10-pin unpopulated header with air particles sensor input, light and sound interrupt outputs, I2C, VPU pin for 3.3V/5V selection, GND, VDD, VIN and RDY (EEADY signal output) Supply Voltage – 3.3V (VDD) …

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Sonoff SNZB Zigbee Sensors and Switches Launched for under $10

Sonoff SNZB Zigbee Sensors Switch

ITEAD had started to expand from WiFi and RF433 capable Sonoff home automation devices into Zigbee smart home solutions in recent months with the launch of products such as Sonoff ZBBridge WiFi to Zigbee gateway and a TI CC2531 based Zigbee USB dongle preloaded with firmware compatible with Zigbee2MQTT. But so far, they had only one Zigbee node, namely Sonoff BASICZBR3 Zigbee power switch. More options are now available with the launch of four Sonoff SNZB Zigbee sensors and switches working with the company’s ZBBridge. Key features of the four new Zigbee sensors & switches: SNZB-01 Zigbee wireless switch Touch button with single, double press and long press support Battery – 3V (CR2450) Dimension – 43x43x16mm SNZB-02 Zigbee temperature & humidity sensor Unnamed temperature and humidity sensor Battery – 3V (CR2450) Dimension – 43x43x14mm SNZB-03 Zigbee motion sensor Built-in PIR sensor with 6m range and 110°viewing angle. Battery – 3V (CR2450) Dimensions – 35x39x28mm SNZB-04 Zigbee wireless door/window sensor Magnet …

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Cucumber ESP32-S2 Development Board Comes with USB OTG Port, Optional Sensors

Cucumber ESP32-S2 USB OTG Development Board

Yesterday, I wrote about LilyGO TTGO ESP32-S2 WiFi IoT board, but one commenter mentioned it missed one of the key features of ESP32-S2 chip: a USB OTG port. While USB OTG  is accessible through the header pins, it’s not the most convenient to use. I also quickly mentioned Cucumber ESP32-S2 development board in that post, but I did not expand too much since I thought it should only ship within Thailand. But the board does include two USB Type-C ports, one for the usual USB UART connector, and the other for USB OTG, and I found out the board is available worldwide. The board is available in multiple variants with or without sensors and PSRAM, and with external IPEX antenna or PCB antenna using ESP32-S2-WROVER(-I) or ESP32-S2-WROOM(-I) module. Cucumber specifications: Wireless Module (one of the other): ESP32-S2-WROVER with ESP32-S2, 4MB flash, 2MB PSRAM, on-board PCB antenna ESP32-S2-WROVER-I with ESP32-S2, 4MB flash, 2MB PSRAM, IPEX / u.FL antenna ESP32-S2-WROOM with ESP32-S2, …

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TransferFi Wireless Power Network Lights Up Sensors up to 55 Meters Away

TransferFi

Wireless charging has been around for a while, and it usually placing a phone or other device on a charging pad. But back in 2018, Energous started to promote its near-field, mid-field, and far-field wireless charging solutions, with far-field meaning within a room. But so far, they only have released near-field devkits and products. Singapore based TransferFi Pte has come up with its own wireless charging solution. TranferFi wireless power network (TFi WPN) aims to power sensors up to 55 meters away and specifically targets building and factory automation in order to help companies save on installation and cabling costs. The solution works with a gateway powering up and receiving data from sensors wirelessly with a range of up to 55 meters.  The TFi Gateway Max Turin-1 covers up to 32 TFi Sense devices via multichannel beamforming supporting up to 16 channels and can be connected to Modbus, BACnet & Web services. The TFi Sense Turin-1 sensor node is powered …

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Select a Geiger Counter for your Phone to Survive the next Nuclear Catastrophe

geiger counter smartphone

It’s time to prepare! No, not for that COVID-19 thingie, it’s too late, but since 2020 has not started the best way we should prepare for all eventualities. It all started badly as I fell off my bicycle on New Year’s eve, and it went south from there, from talks of world war three in January, to the thread of a virus pandemic that could kill millions worldwide, to the start of the first global great depression. 2020 will be the “year of doom“, and we should expect massive earthquakes,  once in a hundred-year megatsunami what will wipe entire cities, gigantic locust swarms in southern Europe, climate change induces, and leading famine, a couple of large asteroids hitting the hearth, and so on. But we should not forget the nuclear threat either via nuclear war or damaged nuclear reactors following natural disasters or terrorist attacks. One way to protect yourself and your family is to check the level of variation …

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M5Stack ATOM is a Compact, Fully Integrated ESP32 Development Kit

M5Stack ATOM Lite

When working on a project you may need an MCU or MCU board, an external display, a breadboard, and other accessories like sensors and jumper cables. It does the job, but it can be messy. Recently, we wrote about M5Stack M5StickV AI camera, but the company is better known for its ESP32 IoT development kits enabling neater project thanks to hardware that integrates MCU, I/O headers, display, and sensors into an enclosure. Their latest offerings are ATOM series toolkits that come in two versions: ATOM Lite and ATOM Matrix. Let’s have a look at both. M5Stack ATOM Lite Specifications: SiP – ESP32-PICO-D4 system-in-package with ESP32 dual-core processor with WiFi 4 and Bluetooth 5.0/5.1 Storage – 4 MB flash Crystal oscillator and passive components USB – 1x USB Type-C port Expansion 9-pin header with 6 GPIOs compatible with jumper cables 4-pin PH2.0 connector with 2x GPIO, 5V and GND Misc – Reset button, user button, RGB LED, IR LED Dimensions – …

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