Since the work on all the mechanical components of Schnauzer is complete the focus now shifts on the completion of the electrical parts. Since the ESCs and the power wiring is already installed the next step is the integration of the batteries into the system. Two 2-cell LiPo batteries with a capacity of 1800 mAh each are used. Those two batteries are connected in serial providing one 4-cell LiPo battery for the ESCs.
Because of the tight space situation in the robot the battery cables need to be shortened down a bit. This is done by cutting off the power cables and soldering a new EC3 female power plug to the cable. Attention: If you ever work with LiPo batteries make sure that the bared red cable touches the black cable at no point during your soldering process - otherwise sparks (in the best case) and an explosion (in the worst case) will ensue. At least one of the two cables needs to be fully insulated.
The next step was to manufacture an adapter which allows to create a single 4-cell battery from two 2-cell batteries. Such an adapter can be seen in the picture below and consists of two EC3 male power plugs. Those plugs are connected with the two batteries while the other end of the cable if connected to Schnauzer's power distribution system.
Since the frame of the robot is made out of Hardox (which makes it really tough to drill holes into it) I had to think of a new method to mount the batteries to the frame. Luckily I do have some spare strong neodymium magnets lying around from the beetleweight arena build.
Two of those neodymium magnets are placed on a rectangular piece of foam material (to provide some sort of cushioning from hard hits against the robots frame). Good old duct tape is used to mount everything together.
The next pictures shows the assembled battery completely covered in duct tape.
In the next picture you can see the two batteries mounted at the rear end of Schnauzer. Since each magnet has a holding forvce of ~ 110 N the batteries are held firmly against the Hardox frame. I am confident that they shall not come loose during a robot battle.
Last but not least a close up shot from the adapter which creates a single 4-cell battery out of the two 2-cell batteries. Also to be seen: The 80 A fuse 😉
Schnauzer is now ready to go 😉 Well nearly, I am still working on a last electronic component which should provide Schnauzer with an edge in the arena ... more details after the event 😉 Speaking of an event: The German Roboteers Assocation is holding a full contact featherweight competition on April 8th, 2017. More details here.