Chhavi – An ESP32-based fingerprint sensor with optional NFC, battery (Crowdfunding)

ESP32 Fingerprint sensor

Chhavi is a compact, wireless, touch-capacitive fingerprint sensor based on ESP32 WiFi and Bluetooth SoC that is offered with optional NFC connectivity and a battery. The Arduino programmable fingerprint sensor is equipped with Fingerprints‘ FPC BM-Lite fingerprint capacitive biometric sensor that’s much more compact and power-efficient than traditional optical fingerprint sensors. Chhavi specifications: SiP – ESP32-PICO-D4 system-in-package with ESP32 dual-core processor @ 240 MHz, 4 MB SPI flash Fingerprint sensor FPC BM-LITE Module with 99% accurate fingerprint sensing Sensor matrix: 160 x 160 pixels Number of pixels: 25,600 pixels Active sensing area: 8 x 8 mm Features – Automatic finger detection, one-to-one verification mode Durability – 10 million finger placements Connectivity 2.4 GHz 802.11 b/g/n Wi-Fi via ESP32 Bluetooth BLE 4.2/5.x via ESP32 Optional 13.56 MHz NFC via NXP PN7150 NFC I2C controller 3D antenna Display – FPC connector for display USB – 1x Micro USB port for power/charging, and […]

Challenger RP2040 WiFi board marries ESP8285 with Raspberry Pi RP2040

Challenger RP2040 WiFi board

We’ve already seen Raspberry Pi RP2040 getting WiFi connectivity with boards like Pico Wireless Pack, Wio RP2040 mini, and Arduino Nano RP2040 Connect in ways that do not always make technical and commercial sense as in many cases, the WiFi microcontroller (e.g. ESP32) is more powerful than the Raspberry Pi microcontroller. But Invector Labs’ Challenger RP2040 WiFi board does make more sense, as the company combines Raspberry Pi RP2040 dual-core Cortex-M0+ MCU with an entry-level ESP8285 WiFi microcontroller, and also offers LiPo battery support, all that in the Adafruit Feather form factor. Challenger RP2040 WiFi board specifications: Main microcontroller – Raspberry Pi RP2040 dual-core Cortex-M0+ MCU @ 133MHz with 264KB SRAM Storage – 8MB flash Network microcontroller – Espressif ESP8285 2.4GHz WiFi 4 SoC with 1MB on-chip flash pre-flashed with Espressif’s AT command interpreter, connected to the main MCU over UART at up to 921600 bps; I/Os via Adafruit Feather […]

ESP32-C3 board comes with 16340 battery holder, D1 mini compatibility

LilyGO TTGO T-OI Plus

It looks like ESP32-C3 floodgates have opened. We’ve just written about several NodeMCU ESP32-C3 boards, and now there’s another board with the RISC-V WiFI & Bluetooth processor. Meet LilyGo TTGO T-OI PLUS equipped with a 16340 battery holder. Getting a battery-powered ESP32-C3 board could prove to be very interesting as ESP32-C3 power consumption is much lower than ESP8266 and ESP32, notably in deep sleep mode, where the RISC-V processor consumes just 5uA, against 20 uA for ESP8266 and ESP32, and the difference is even greater in light sleep mode (ESP8266: 2000 uA vs ESP32-C3: 130 uA). LilyGo TTGO T-OI PLUS specifications: SoC – Espressif Systems ESP32-C3 single-core RISC-V processor @ 160 MHz with 2.4 GHz WiFi, Bluetooth 5.0 LE Storage – TBD flash (probably 2MB or 4MB) Antenna – Ceramic antenna and IPEX connector USB – USB-C port for power and programming Expansion 2x 8-pin headers with 12x GPIO, 1x […]

PiSugar S and PiSugar S Pro – Lower cost batteries for Raspberry Pi

PiSugar S Pro for Raspberry Pi 3/4

PiSugar battery for the Raspberry Pi Zero was introduced around two years ago, followed the next year with a 5,000mAh PiSugar 2 battery for Raspberry Pi 3/4 which is currently sold for $49.99. But the company has now designed lower-cost versions of the batteries with PiSugar S for Raspberry Pi Zero board, and PiSugar S Pro for Raspberry Pi 3/4 single board computers. PiSugar S Pro – Battery for Raspberry Pi 3/4 PiSugar S Pro offers a 5,000 mAh battery capacity with up to 3A output current for a typical battery life of 8 to 10 hours. A micro USB port and a USB Type-C port can be used for charging. The board also adds a GPIO button to turn on and off the Raspberry Pi board cleanly, or alternatively can be used as a custom button when the board is running. The battery module also supports the UPS function […]

TinyS2 ESP32-S2 board is designed for battery operation

TinyS2 ESP32-S2 board

Unexpected Maker has launched a follow-up to the ESP32 based TinyPICO board with TinyS2 board equipped with an ESP32-S2 WiFi processor featuring 4MB flash and 2MP embedded PSRAM. The new board is still designed with a LiPo battery charging circuit, comes with an onboard RGB LED, and while it is compatible with TinyPICO form factor, it has become a little longer with a 41 x 17.8mm footprint to accommodate for extra I/Os. TinyS2 specifications: WiSoC – Espressif Systems ESP32-S2FN4R2 single-core processor @ 240 MHz with 4MP SPI flash, 2MP PSRAM Connectivity – 2.4 GHz 802.11b/g/n WiFi 4 plus 3D antenna USB – 1x USB Type-C port for power and programming Expansion – 12 + 11-pin headers for up to 17x GPIOs, SPI, I2C, UART, ADC, DAC, 5V, 3.3V and BAT signals Misc – Boot and Reset buttons, battery charging status LED, power LED, user-programmable RGB LED that can be shut […]

Power Profiler Kit II measures power consumption in Nordic Semi based embedded systems

Power Profiler Kit II

If you’re developing battery-powered products it’s important to optimize your application to consume as little power as possible to extend battery life. As we’ve seen with Qoitech Otii Developer Tool, getting the right tool for development can help developers work more efficiently, and save countless man hours. If you’re specifically working on products based on Nordic Semi nRF51, nRF52, nRF53 or nRF91 wireless chips, the company has just announced the Power Profiler Kit II (PPK2) that enables easy and affordable power measurement of average and dynamic power consumption in embedded solutions based on the aforementioned wireless SoC’s/SiP’s. Power Profiler Kit II key features: 200nA to 1A measurement range Resolution varies between 100nA and 1mA depending on the measurement range Instantaneous and average current measurement for all Nordic DKs, in addition to custom HW Ampere meter and source modes Built-in programmable regulator with a 0.8V to 5V output range and up […]

ESP32-S2 board targets battery-powered applications with 30uA deep sleep power consumption

ESP32-S2-DevKit-LiPo vs ESP32-S2-WROVER-Devkit-LiPo

A few months ago, Olimex unveiled renders of ESP32-S2-Devkit-LiPo WiFi board that was supposed to consume as little as 2uA in sleep mode, follows ESP32-S2-Saola-1 board form factor and pinout, and adds an ultra-efficient circuitry to support LiPo batteries. The good news is that Olimex has now launched two versions of their ESP32-S2 board optimized for battery-powered applications with ESP32-S2-DevKit-Lipo and ESP32-S2-WROVER-DevKit-Lipo (with 2MB PSRAM) going for 5.56 Euros and 6.36 Euros respectively. ESP32-S2-DevKit-LiPo specifications: Wireless module: ESP32-S2-DevKit-LiPo – ESP32-S2-WROOM with Espressif ESP32-S2 single-core 32-bit LX7 microprocessor up to 240 MHz with  128 KB ROM, 320 KB SRAM, 16 KB SRAM in RTC, 4MB SPI flash ESP32-S2-WROVER-Devkit-LiPo – ESP32-S2-WROVER – same as above plus 2MB PSRAM Wireless connectivity – 2.4 GHz 802.11 b/g/n WiFI 4 up to 150 Mbps Expansion – 2x 20-pin I/O headers with SPI, I2S, UART, I2C, touch sensors, PWM, etc… (pin-to-pin compatible with ESP32-S2-SAOLA-1) Debugging – […]

Using an Old Cassette Tape to Enclose a Battery-powered Raspberry Pi Zero

Raspberry Pi Zero Cassette Tape Enclosure

If you’re old enough you may have a stock of old cassette tapes that may or may not work anymore. The good news is that if you have time on your hands, you could recycle those as a Raspberry Pi Zero enclosure, including even other components like a small battery, battery charging board, and display. That’s exactly what Martin Mander did with his Cassete Pi IoT scroller project that receives notifications via IFTTT service and displays them as scrolling text on a small display connected to the Raspberry Pi Zero W. Here’s the detailed list of components used in this project: Raspberry Pi Zero Wireless Pimoroni LiPo SHIM LiPo/LiIon power supply shim for Raspberry Pi boards Adafruit Micro Lipo charger board with micro USB port Pimoroni 11×7 LED Matrix 150 mAh Li-Polymer Battery Cassette Tape DPDT Slide Switch Vibration motor Once assembly is done, you can flash a Micro SD […]