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DIY PORTABLE WORK STATION
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Yes but he is an engineer. So obviously he can take a pee on anything he wants online..Obviously.
Note that the single relay modules may lack the optocoupler.Personally, even at 5v, I've had problems driving a 4-relay module using a PCF8574. For the RBP I've read that an 74LS244 or 74LS245 buffer IC may help, also with bridging different voltage levels. Just thought I'd mention that.
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