Reference
Last revision 2025/12/30
The blog post discusses the design and safety considerations for motor drive products, focusing on the use of CR123A lithium batteries and advanced power management to ensure durability and safety, particularly for children.
Library
Motor drive library address: https://github.com/DFRobot/pxt-micro-IOBOX
Principle
We design an outer protective cover for the product to make it more durable and indestructible. Besides, we also paid close attention to the safety of using the product, especially when most users are children. On the market, currently, some manufacturers adopt 18650 battery for their products. However, this kind of battery has explosion threats to people due to its high capacity and large size. Therefore, after a long-term testing, we selected CR123A 3.6V lithium rechargeable battery of1000mA. This kind of battery features small size, large capacity and high safety. What’s more, we set short circuit and reverse connection protection for it to further improve the safety in using Li-ion Battery.
In order to provide a stable power supply, we employ a high-cost boost-buck power management solution. As we know, a motor’s instantaneous current can reach up to 1A at its starting instant, which is a big challenge for power supply. So we specially carried out a strict test on our product: we make two TT motors keep rotating forward and reversely continuously, and even in such a condition, the board and motor can still work about 1.5 hours until running out of the battery.
Other Supplementary Information
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