6 minutes read (About 969 words)

iOS蓝牙开发-超声波测距仪

写在前面：本来的计划是做一个 pm2.5 测量仪的，毕竟北京的空气有时很糟糕。去网上找粉尘传感器，发现有 200 多的，有 20 多的。看了眼支付宝余额……默默选择了 20 块钱的。结果到手之后发现精度实在太低了，而且线头又短又软，适合焊接而不是插到面包板上🤦‍♂️只好先改成了超声波测距仪。 Pm2.5 测量……就以后再说吧……

硬件电路

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14 minutes read (About 2087 words)

iOS 蓝牙开发初步

注意：CoreBluetooth 是基于 BLE 4.0 版本的。

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