Tagged Questions
4
votes
1answer
77 views
How do I connect a signal shield to minimise noise from close proximity AC
In my proposed application, I will have approximately 30 RS-485 nodes configured in 3 chains spaced ~1m apart. There is a need to pass through 240v L-N-E, +5v, A, B, GND in each node. The physical ...
1
vote
3answers
357 views
Common ground and voltages
Further to a question I asked earlier, I realised that common ground confuses me. I have a USB powered Arduino and a separate Battery supply. The battery supply negative is connected to the Arduino ...
1
vote
2answers
658 views
Controlling multiple motor drivers with one Arduino
I have one Arduino and I need to be able to control five to seven 12V motors that each draw about 4 amps.
Would I be able to use four Sabertooth 2X5 Regenerative Motor Drivers for this? Each driver ...
1
vote
3answers
1k views
Sensor reading is chaotic when Arduino is powered by laptop unplugged
I have a Sharp proximity sensor connected to my Arduino (analog input). This Arduino is connected and powered through USB by a laptop.
When the laptop is plugged in, everything works fine (I get
...
3
votes
2answers
636 views
arduino's pin number 7, isn't it dangerous without resistor?
I am reading a book called Getting started with Arduino. In that book, I don't understand why there is no resistor between pin number 7 and the switch (see diagram:)
If there is no resistor ...
5
votes
1answer
1k views
Arduino Duemilanove external power source with USB connected
Can Duemilanove USB interface be used for data transfer/programming when the board itself is connected to an external power source? (say, USB is not powerful enough)
What are the requirements for the ...
18
votes
4answers
2k views
When a battery is your power source, what is ground?
For the sake of not incorrectly connecting my power supply and damaging my board I'm going to ask a relatively dumb question. Is ground on my board the negative terminal on my battery? Explicitly ...
