TXS0108E 8-Channel Bidirectional Logic Level Converter MOT-ACC Shaft Length: 55mm ± 1mm

Shaft Length: 55mm  ± 1mm

or cable chains

6WD Metal Robot Chassis DIY Platform can be controlled with Arduino

Refer to AVRStudio 4

also grab a supporting swivel wheel

TXS0108E 8-Channel Bidirectional Logic Level Converter MOT-ACC Shaft Length: 55mm ± 1mmProvide two way communication capability at varied voltage levels to your electronics project with the TXS0108E. This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will auto detect the direction. Only thing that doesn't work well with this chip is i2c (because it uses strong pullups which confuse auto direction sensor). If you need to use pullups, you can but they should be at least 50K ohm the ones internal