ESP32 - DIY force sensor for use in phyphox.
the sensor can be used to measure the force as a function of time. the measured values can be read out directly on the smartphone with phyphox. 
the code can be found at https://github.com/HeiLaut/ble-physics-sensors/tree/main/Force%20Sensor/Arduino/load_cell_esp_phyphox

Parts required:

• esp32 lolin lite
• 1 kg load cell with hx711
• 2 m4x20 screws
• 2 m4 nuts
• 1 m5 hook
• 2 m5 nuts
• 2 m5x14 screws
• 12 x 12 x 7.3 mm tactile push button

optional:

• SS-12F15 on/off-switch
• Lipo battery