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'''Q: Why OLED is not display?'''
A: Please follow the steps below to check
1. Please confirm that your OS is right:
Due to downloading the wrong firmware, the OLED cannot be displayed. We '''ALSO''' made such mistakes during testing.
[[File:Pi4-V3-HAT.png|800px]]
2. Please check if the order of OLED screen pins is correct, please contact us if it's a wrong pin order;
[[File:OLED-IMG-4373-1.jpg]]
3. Run the following command to check the I2C address:
<pre>
pi@raspberrypi:~ $ sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
</pre>
3c is a hexadecimal number, it is the I2C address of OLED, if you can’t find this value, please shut down and reconnect X630-A3&OLED and run this command again, If you still can't find the OLED's I2C address, the OLED screen may be damaged.
4. Then run the following command to enable OLED display:
rw
systemctl enable --now kvmd-oled
ro
'''Q. I want to control several pc power. Is it possible with one PiKVM-A3 and several x630-a5'''