Assembly guide for the Ergo Jr
The Poppy Ergo Jr robot is a small and low cost 6-degree-of-freedom robot arm. It consists of very simple shapes which can be easily 3D printed. They are assembled via OLLO rivets which can be removed and added very quickly with the OLLO tool.
Its end effector can be easily changed. You can choose among several tools:
- a lampshade,
- a gripper,
- or a pen holder.
Thanks to the rivets, they can be very quickly and easily swapped. This allows the adaptation of the tooltip to the different applications you plan for your robot.
The engines have the same functionality as other Poppy creatures but are slightly less powerful and less precise. The advantage being that they are also less expensive.
The electronic card is visible next to the robot, which is very advantageous to understand, manipulate, and plug extra sensors. No soldering is needed, you just need to add the shield for XL-320 motors on top of the Raspberry Pi pins.
This chapter will guide you through all steps required to entirely assemble a Poppy Ergo Jr. It will cover:
The entire assembly should take about one or two hours for the first time you build one. With more practice, half an hour should be more than enough.
At the end of the process, you should have a working Poppy Ergo Jr, ready to move!
We recommend you to follow carefully the instructions. Even if the Ergo Jr can be easily disassembled, it is always disappointing to need to start from scratch again because you forget to configure the motors, a wire is missing, or a motor is reversed.
Bill of materials
Here you will find the complete list of material (BOM) needed to build a Poppy Ergo Jr.
- 1x Pixl board (electronic board to control XL320 motors)
- 1x disk_support.stl (using laser cutting) the 2D plan can be found here. You can also 3D print the base but it will take a lot of time
- the 3D printed parts STL here
- 6x Robotis dynamixel motors XL-320
- 1x set of OLLO rivets (about 70 colored and 4 grey)
- 1x OLLO TOOL
- 4x M2.5x6mm screw (for fixing the Raspberry Pi on the base)
- 4x M2x5mm screw (for fixing the camera)
- 4x M2 nuts (fixing camera)
- 1x Standoff Male/Female M2.5 10mm
- 1x Raspberry Pi 2
- 1x micro SD 8Go
- 1x Rasperry Pi camera
- 1x AC power 7.5V 2A with a 2.1 x 5.5 x 9.5 jack connector (this one for instance).
- Short ethernet cable