Help: Test the solenoid valve. The specific situation is as follows: use a 15.5v starting voltage to power on, so that the solenoid valve closes for 1s, then the voltage drops to a 5v stable voltage, ...
I want to use the two-corner bidirectional light-emitting tubes and ordinary light-emitting diodes to light up alternately, turning on green light, bidirectional blue light, and bidirectional red ligh...
[i=s]This post was last edited by jj1989 on 2019-1-15 17:49[/i] [size=4][md]## Preface The previous article unpacked and simply got started with the **Rapid IoT Prototyping Kit SLN-RPK-NODE**, experie...