motors

Battman Battery Management System

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From Raphael Chang:

battman_v4.1.jpg

Battman Battery Management System

As part of the fully custom electric longboard I am building, I designed a battery management system (BMS) for a 12 cell lithium ion battery pack. The BMS, named “Battman”, is meant to monitor both Lithium Polymer cells (LiPo) and Lithium Iron Phosphate cells (LiFePo4), and it can protect the batteries against undervoltage, overvoltage, overcurrent, and overtemperature.

It also has an integrated charging circuit that can perform constant current/constant voltage charging of the cells up to 6A, while performing balancing of the cells at 100mA. In addition, it functions as the main power switch of the longboard system, and includes a precharge circuit to limit inrush currents. Finally, the BMS does current measurements for coulomb counting, and performs state-of-charge calculations.

The project is shared in these GitHub repos:

Andrius has shared the board on OSH Park:

Battman lithium ion battery management system

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Order from OSH Park

Battman Battery Management System

DIY 6-Axis Micro Manipulator

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[David Brown]’s entry for The Hackaday Prize is a design for a tool that normally exists only as an expensive piece of industrial equipment; out of the reach of normal experimenters, in other words. That tool is a 6-axis micro manipulator and is essentially a small robotic actuator that is capable of very small, very precise movements.…

via Hackaday Prize Entry: DIY 6-Axis Micro Manipulator — Hackaday

DIY 6-Axis Micro Manipulator

Servo Shield for OpenMV

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Radomir Dopieralski created this PCA9685-based servo shield for the OpenMV machine vision board:
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Servo Shield for OpenMV

OpenMV has a couple of pins that you can use for connecting servos (for example, if you want to mount it on a pan-and-tilt base), but you can’t use those if you also want to use the WiFi shield or any other shield that uses up a lot of pins. Practically the only pins left to use are the I²C ones

deshipu has shared the board on OSH Park:

OpenMV Servo Shield

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Order from OSH Park

Servo Shield for OpenMV