Hi, for iSpindel there are two options:
With XXL Pet, you use a a 3D printed sled and a small PCB to add a Wemos D1 mini, it's a microcontroller with Wifi, a Tilt sensor MPU6050 and a battery charger TP4056
With XL Pet, same as the other but without sled and a bigger PCB to fit into that PET...