Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
if uart.readchar()==1: uart.write(你的数据)
你哪里有问题？
确定有r3吗？也就是有画框吗？
有试过OpenMV 直接write(“3”)看效果吗？也就是用示波器/usb-ttl看过数据？
你先确认上面两个问题。把你的疑问继续讲出来。