Simple ESP32-S3-mini posture corrector. Corrector uses accelerometr to check how straight you standing or sitting and based on usually user set boundaries it vibrates, if you cross set boundary....
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ESP-c3-mini => https://www.laskakit.cz/laskakit-microesp/
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ADXL345 => https://www.laskakit.cz/triosy-akcelerometr-gy-291-s-adxl345--i2c-spi-/
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vib. motor
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npn transistor
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Li-Po 3,7v 540 mAh
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on/off switch
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power connector
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TP4056 batt. charger => https://www.laskakit.cz/nabijecka-li-ion-clanku-tp4056-s-ochranou-microusb/