Pistontank with arduino and TB6612fng driver. 

Home made pistontank and teckrack for Revell skipjack rc submarine. Piston is driven by arduino nano and TB6612fng h-bridge dc motor driver. Arduino program from the internet slightly changed but original written by Eric Weber.
The pistontank is made from 3d printed parts, some gears and acryl tube 60mm.
Speed is a little slow because the piston is very snug fit and i might change the rubber sealing.