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Bonding Earth to Aluminium robot chasis

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marcuso

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Hi,

I have a Aluminium chasis robot, the wheels are metal (but wrapped in rubber tank tracks - so no connection to Earth). I have various voltages on the system 12v to motors and shield, 7 v to Arduino and R Pi 3's (via DC-DC converter). Should I just onnect allthe -ve terminals of my batteries (some lipo some nimh) to the chasis ? And then should connect all my sensors, and -ve (gnd) of al my components ie motors, pis, arduino to the chasis ?

Thanks.
 

There is possibility of a robot malfunctioned or a sensor did not work due to bad grounding. A (bad) ground loop occurs, when there are two ground paths and a difference in potential (ie voltage) between them. Ground loops can be formed by having impedance differences between ground points in the system be different from each other.

Hence, all the GND terminals shall be shorted together.

Some circuitry may want to be isolated compared to common ground, but those cases are the exception rather than the rule most of the time. Just check the isolated GND requirement for the circuit/component. if not, no need to bother.
 

Hi, thanks for the response. so if I've got this right then I can connect all my battery -ve to the chasis (even though the batteries are different types - lipo/nimh and voltage ratings/mah etc), then take all the -ve for my sensors, arduinos, motors, raspberry pis, lights etc and connect all their -ve to the chasis. This would mean a common ground, less chance of static or electric shock and 1/2 the amount of cable (no gnd back to battery). So just like a -ve grounded modern car , Is this right ?

Marcus
 

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