The cute little dog with titanium eyes

The whole thing is mainly composed of three PCB boards, Hi3861 development board + motherboard + dog head!
The development board consists of a minimum system, 5V-3.3V circuit, download circuit, etc. It can also be used alone to develop Hongmeng projects;

This board was drawn in my last Hongmeng Smart Switch training camp, and is reused in this training camp;

https://oshwhub.com/520world/yao-bai-di-ren-ti-cun-zai-zhuan-gan-qi
The mainboard consists of two lithium battery charging circuits, 8.4 to 5V circuit, 5V to 3.3V circuit, rudder It is composed of machine control chip circuit;
the dog head part is an infrared obstacle avoidance circuit!

Issues to note:

The inductor and MOS tube in the charging circuit generate a lot of heat during charging, so remember to attach a heat sink!

Known issues that still need to be resolved:

1. The official sample program is used for the time being, and the obstacle avoidance circuit does not work. It is only active now ;

2. The screws of the movable joints of the dog legs will loosen and slip off during running. I used 502 glue to stick the nuts on to temporarily solve the problem. Is there any other good solution?

3. Two 18650 batteries are used. The weight of the dog is too great, and the MS90 servo currently used is a bit difficult to carry!

Appreciation of Lichuang Circuit Design:

Two lithium battery charging circuit:

Steering gear control chip circuit:

Infrared obstacle avoidance circuit:

PCB board appreciation:

Appreciation of the finished product: