Utilizing a small pen form factor, this design operates as a hand-held scanner with optical character recognition (OCR). The pen not only captures and stores the characters available for download, but it can also read the words to you via a small built-in speaker. At the heart of this design is the Renesas RL78/G14, an industry-leading lowest power MCU. The MCU interfaces to the image sensor and a micro-SD card as well as controls the volume of the speaker via a digitally controlled potentiometer. Additionally, the pen is powered off of a rechargeable battery, which is charged via the ISL9205 battery charger.

For details on how to build a pen scanner/reader, see the Talking Pen RL78 Quick Solution reference design page.

Key Features

  • Scans with OCR and captures data on a micro-SD card
  • Reads captured sentences back via a built-in speaker
  • Operates on very low current and enables long battery life
  • Small form factor with rechargeable battery via the USB interface
System Block Diagram

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