Electronics > Beginners
Voltage Drop at Breadboard
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IanB:

--- Quote from: Zero999 on March 10, 2019, 06:20:51 pm ---anbudroid,
Did you measure the voltage directly at the DC:DC converter's input and output terminals on the board?

--- End quote ---

Don't the pictures attached to the first post show these measurements?
rdl:
Don't use the rails on the breadboard. Run long wires for power directly to and from the DC-DC converter to the devices being powered. Connect them in the closest hole(s) to the part's power pins. Maybe even in the same hole if it's not too tight. If that fixes the problem then you might have a bad breadboard or the existing connections are bad. If it doesn't fix the problem, then something else must be wrong.

tggzzz:
Isn't debugging solderless breadboards so much ... fun. And such a good way to learn electronics too.
Zero999:

--- Quote from: IanB on March 10, 2019, 07:03:40 pm ---
--- Quote from: Zero999 on March 10, 2019, 06:20:51 pm ---anbudroid,
Did you measure the voltage directly at the DC:DC converter's input and output terminals on the board?

--- End quote ---

Don't the pictures attached to the first post show these measurements?

--- End quote ---
Yes, you're right, I didn't look. :palm:
sleemanj:
There is no magic, it's resistance, the question is where is the resistance.  If we look at your pictures between the DC/DC and the arduino are MANY connections into the breadboard, the DC/DC into two holes, then a pair of jumper wires from there to the rail (4 connections), then a pair of jumper across the rail break (another 4 connections), then another pair of jumpers from the rail down to the nano (another 4 connections), then the nano's connection down itself, another 2, that is 16 connections (8 + and  8 -) to between the DC/DC and the nano, I am not surprised to see even a couple of ohms lost there just in connections.

Chuck a decent sized cap across each device's power connection on the breadboard and that will help matters (if they need helping, if everything works, why worry).
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