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==Pins and GPIO used==
PIN33 (GPIO13) is replaced by the PIN37 (GPIO26) to avoid the I2S interface from v1.3 to v2.2.
{| class="wikitable collapsible collapsed"
! Pin No. !! Usage
| 32 || GPIO12 for power management
|-
| 33 || GPIO13 for power management<span style="color:red;">(For V1.2 and previous versions only)</span>
|-
| 31 || GPIO6 for AC power loss detection (Jumper for PLD inserted, High=power loss,Low=Power supply normal)
|-
| 37 || GPIO26 for power management<span style="color:red;">(For V1.3 and later versions only)</span>
|-
| 38 || GPIO20 for buzzer control <span style="color:red;">(NEW Add on V2.1 only)</span>
|}
==PCB Layout==
<gallery>