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


Chhavi is a compact, wireless and tactile fingerprint sensor based on ESP32 WiFi and Bluetooth SoC which comes with optional NFC connectivity and battery.

The Arduino programmable fingerprint sensor is equipped with Fingerprints‘FPC BM-Lite capacitive biometric fingerprint sensor which is much more compact and energy efficient than traditional optical fingerprint sensors.

Specifications of Chhavi:

  • SiP – ESP32-PICO-D4 Integrated System with ESP32 240 MHz Dual Core Processor, 4MB SPI Flash
  • Fingerprint detector
    • BM-LITE FPC module with 99% accurate fingerprint detection
    • Sensor matrix: 160 x 160 pixels
    • Number of pixels: 25,600 pixels
    • Active detection 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 debugging via CP2102 USB to UART converter
  • Miscellaneous – Power switch, reset button, vibration motor for haptic feedback, 2x user LEDs
  • Power source
    • 5V via micro USB port
    • Supports 250 – 500 MAh LiPo batteries
    • LDO regulator 600 mA, 3.3 V
    • ESD protection, over voltage, over current protection for USB
  • Dimensions – 26 x 26 x 9 mm (without battery)

Chhavi specifications: ESP32, fingerprint, NFCThe company behind the project, Vicharak, will provide resources to Chhavi on Github. Right now, the repository only contains an Arduino sketch to display live fingerprint data in a web browser. The company will also release the Arduino library and is also working on a library compatible with the ESP-IDF framework.

Some of the use cases for the Chhavi ESP32 based fingerprint sensor include logging into a desktop computer, unlocking a password manager, implementing door locks, and other controls. physical security, attendance management systems, etc.

Vicharak just launched Chhavi on crowd offer, which happens to be their second project on the crowdfunding platform after the Maypole ESP32 wireless storage dongle. There are four rewards between $ 49 and $ 69 depending on the NFC and battery options adding $ 10 each. Shipping adds $ 8 to the US and $ 20 to the rest of the world, and backers should expect their rewards to ship by February 2022.

The price is in line with other fingerprint solutions for manufacturers, such as PiFinger Fingerprint HAT for Raspberry Pi, and one advantage is that a microcontroller, namely ESP32, is already included, so a host system does not. is not necessary unlike many other solutions as shown in the comparison table below.

Chhavi vs gt521f52 vs r301t fingerprint modules

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