Casio F-91W has been transformed into a smartwatch

Electronic enthusiasts interested in upgrading a classic Casio wristwatch, turning it into a hackable, programmable smartwatch, may be interested in the Sensor Watch object on Crowd Supply after they initially raised more than $45,000 thanks to more than 700 backers, a unique smartwatch project available. Now to pre-order with prices starting at just $36.

Casio smart watch

“Sensor Watch is a bridge between the ages. It takes an iconic 30-year-old design from the golden age of digital watches, and pairs it with a powerful modern microcontroller and state-of-the-art sensor capabilities. This small circuit board, less than an inch in diameter, replaces the original quartz movement on the Casio F-91W to put the capabilities of the ultra-low-power ARM Cortex M0+ microcontroller on your wrist.”

Casio smart watch screen

“A sensor watch is not like most smartwatches. It makes a different set of engineering trade-offs, to achieve a different set of goals:

Instead of a high-resolution TFT LCD, the Sensor Watch reuses the Casio F-91W’s monochrome LCD. This gives it an always-on display that draws just a microamp of power.
By avoiding energy-hungry features like Wi-Fi and Bluetooth, the Sensor Watch can run for a year or more on a single 100mAh coin cell, eliminating the need for frequent recharging.
The lack of an external charging port, combined with the reuse of the famous F-91W waterproof enclosure, makes this watch a permeable wristwatch that can handle depths of up to 30 metres.”

“There are others (stopwatch, heart rate, battery voltage), but the important thing is not the apps that come with the Sensor Watch. The important thing is that Sensor Watch is open source and easily hackable, which means you can write the apps that work for you. Want a face? In astronomy that shows you the phases of the moon and predicts the passage of the satellite? A transit face programmed as the train arrives at the nearest subway station? The face of astrology can tell you if Mercury is in retrograde? These are all applications you can write for Sensor Watch.”


  • ARM Cortex M0+ microcontroller operating at up to 32MHz
  • 256 KB of on-chip flash, with an EEPROM simulation space of up to 16 KB
  • 32 KB of RAM with full retention in low power standby
  • 32.768 kHz crystal for real-time clock functions with alarm support
  • PWM’able red and green LED backlighting (red and blue on limited edition panels)
  • Onboard USB Micro B connector
  • Double click reset button with UF2 bootloader
  • Flexible nine-pin PCB connector for sensor boards
  • Ten-digit LCD display controller, plus five indicator segments
  • Edge-coated contacts of three interrupting buttons
  • Piezo whistle contact pad (requires light soldering)
  • open source

Source: Crowd Supply

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