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sensor:pcf857x [2026/05/14 16:34] – [Wiring with relay modules] vamsansensor:pcf857x [2026/05/14 16:58] (current) – vamsan
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 The current limits of the PCF857x are heavily lopsided because of its quasi-bidirectional architecture. It handles current entirely differently depending on whether you are sinking current (outputting 0/LOW) or sourcing it (outputting 1/HIGH). The current limits of the PCF857x are heavily lopsided because of its quasi-bidirectional architecture. It handles current entirely differently depending on whether you are sinking current (outputting 0/LOW) or sourcing it (outputting 1/HIGH).
  
 +The [[arduino:display_lcd#i_c_lcd_adapter|I²C LCD adapter]] utilizes the PCF8574.  
  
 **Main Control & Power Header** **Main Control & Power Header**