marwi:
groundfungus:
The TIP 120 transistor is a NPN darlington type. The BD710 is a PNP transistor. The two are very different and do not work the same.oh my... how come I have overlooked that. :~
luckily I just found a site that explains a lot (PNP Transistor switching)
thank you groundfungus
You can still switch the solenoid on/ off you just need to change the logic from your arduinio to allow it to work..
7hc595 br the cheapest solution to control multiple devices with limited pins