Handheld RF Data Logger and Controller with SD Card Expansion
thingiverse
The device is a handheld multipurpose radio frequency (RF) data logger featuring a reconfigurable user interface (UI) and expandable storage via an SD card slot. It's powered by an Adafruit Feather M0 microcontroller coupled with an RFM69 radio packet transmitter. Currently optimized for operation in the ~1 GHz Industrial, Scientific, and Medical (ISM) band, this device boasts a custom-built miniature 9-key keypad and a high-resolution 128x128 pixel TFT LCD display. The rear enclosure is precision-machined from high-quality billet aluminum alloy 6061, while the front cover is 3D printed with a faux wood finish to achieve an ultra-minimalist and sophisticated design aesthetic. Equipped with a built-in 2000mAh lithium-ion (Lipo) pouch cell battery, this device can operate continuously for up to a year without requiring recharging. On the software side, I successfully enabled triple independent high-speed SPI communication at 12 MHz on the Feather M0 microcontroller. This allows for simultaneous updates of the TFT display and transmission of data to both the RF module and SD card.
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