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bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required
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Skr 1.4t relay psu #587

Open slayernn021 opened 5 months ago

slayernn021 commented 5 months ago

Hello. Im having trouble connecting psu relay, skr 1.4t and external usb power. I power board via switch which connect small 5v psu and +5v on usb, next i use standard gcode m80/81 to switch on/off psu, everything work fine. Now where it comes to problem. I wire usb data to external micro usb module so i can use pronterface etc, without +/- as +/- is obtained true small 5v psu. When i try to connect with data only true pronterface, its not detecting. If i add +/- it detect but...now i have 2x +5v on board/usb? I see some bugs like touch on laptop was unresponsive, i imedietly disconect it. What is correct solution to prob? Thanx all!

slayernn021 commented 5 months ago

Solution to problem with relay! PS_ON pin on skr 1.4t give "weak" power so i used simple npn transistor as switch between relay + and Signal in. Weak PS_ON from skr board is applied to npn transistor base. It work normal now! Thnx anyway.