The diagram below shows the mounting holes intended for electronics that use a common Arduino form factor, including the {{pl|10|Arduino Uno R3}} and A-Star 32U4 Prime <small>([https://www.pololu.com/category/165/a-star-32u4-prime gamme A-Star Prime chez Pololu])</small>.
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{{POLImage|Pololu-Romi-Chassis-Dimensions-10.png|640px|Monter un microcontrôleur au facteur de forme Arduino sur le Romi}}
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Please note that the two mounting holes indicated above are on two surfaces of differing heights. The top of the battery box sits 10 mm higher than the round base. One way to compensate for this is to use <small>([https://www.pololu.com/category/93/spacers gamme A-Star Prime chez Pololu])</small>. In particular, a 10 mm spacer can match the battery box height, then 4 mm or 6 mm spacers can raise the electronics enough to make room for components that protrude below the bottom surface of the PCB.
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If you are using an Arduino for controlling the Romi, you might consider our DRV8835 Dual Motor Driver Shield for Arduino {{polpl|https://www.pololu.com/product/2511}}.