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* Remove the hardware ASD function and change it to software implementation
X728
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==X728 V2.0 is released==
* PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.0.
* Improve the power path function, the battery will only charge and not discharge when connected to the PSU(power supply unit). [The PSU power will charge the battery and also pass through to the RPi when it has power. If the PSU loses power (power failure), the X728 will switch over to battery power.]
==X728 V1.3 is released==
X728 V1.3 is released at Febuary 2021.
* V1.3 <span style="color:red;">removes</span> Remove the hardware ASD harware function and adds power surge protection function, but we '''new add''' the change it to software shutdown python script when battery is low voltage, please rerfer to [[X728-Software]]implementation
* The charging power indicator (LED1-LED4) is relatively brighter than V1.2.