Can I connect two power supply GND togheter?
I use a 5V power supply for it (by now a 2A phone charger), and it will controll a “power board” with some MOSFET, etc running at 12-24V. The power board is connected to an external 12-24V switching power supply. Can/should I connect the two power supply GND togheter? You have to connect them, otherwise your circuit will most probably not work.
Do you have to connect two power supply grounds?
You have to connect them, otherwise your circuit will most probably not work. If you do not connect both grounds, the voltage between these two grounds is somewhat random (determined by surrounding air, environment,…) and your signals might not be what you intended. The best method is to connect the two grounds at exactly one point.
What’s the best way to connect two grounds?
The best method is to connect the two grounds at exactly one point. This is called the star point. Make sure the ground connection from your power board has low resistance (thick wire) to keep the voltage drop over it small.
Do you have to connect ground to GND?
Please mind you have to connect grounds with little resistance. So yes, most of the time you have to connect GND together. If you connect ground of two voltage systems like 5V and 24V then any fault in 5V will burn out other 24V lines.
How do you connect power to an Arduino?
Connect the power both ways round. The way round that it lights the LED is the correct way round, and you know that the connection that goes to the cathode (flat side of the lip round the bottom of the LED) is the negative. Majenko explained how to figure out what is what.
How to ground an Arduino with an external transistor?
Set it to DC Volts in the right range then connect the two probes (correctly inserted into the right sockets on the DMM) to the power supply’s output connections. If the voltage reads positive then the black probe is connected to negative.