Confused about nets routed

Hi. I have an error where it says nets not routed for the connection between the Vin pin of the Ardunio nano and the 5V pin.

rocket.fzz (23.6 KB)

Is this a bug or how should I fix it?

The immediate problem is obvious your circuit is miswired and if powered like this is likely to damage most of the components. Here I right clicked on the battery positive terminal. It should connect to Vin on the Nano but is shorted to the 5V connection (thus putting 9V where the devices are expecting 5V max and likely damaging them.) This has the effect of lighting in yellow everything connected to the net which shows us that Fritzing is expecting a connection (from schematic) between VIN and 5V causing the rats nest line.

The 9V connection should go to the VIN pin which will reduce it to 5V on the 5V pin via the internal regulator on the Nano and power the other circuits like this:

Here you see there is still a rats nest line between VIN and 5V because the pins are still shorted in breadboard.Schematic is similarly wrong in a variety of places. First there is the short from VIN to 5V (which is what is causing the rats nest line in breadboard as there isn’t a connection there in breadboard.) Then it is unclear why the switch is trying to switch ground through a 10k resistor to the ground of the SD card. This almost certainly won’t work because SD cards draw a fair amount of current and the 10k resistor will mean the SD card has no ground and thus won’t work. There is no power source (presumably should be the 9V battery) for the coil so the coil will never energize. The 10K resistor on the gate of the mosfet appears redundant as the gate is driven by the nano and will be either high or low so the resistor will have no effect. There may be more issue that I haven’t immediately seen as well as I have no idea what this is intended to do.

Peter

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Thank you for your detailed reply!! This is one of the more complex circuits that I’ve made so I’m still confused about some things. I’m trying to make a circuit where I can push a button and have it turn on a solenoid valve and record data from the loadcell amp on to the SD card. The final product is to let me control the fuel into a rocket engine and record data from it.

Moving forward, I should:

  • Fix the connection between the battery and the breadboard
  • Fix the switch connection
  • Rewire the SD card
  • Remove 10k resistor from SD card GND
  • Rewire power for the solenoid

Please let me know if theres anything else!

It would be a good bet to clean up both breadboard and schematic to make them as readable as possible. Also a good bet to start with breadboard (or schematic), do one completely then route the other according to the rats nest lines. That will point out many errors all by itself as you see connections where you don’t expect them. As well you probably need to look at power issues. The on board regulator on a Nano is likely only good for 50Ma or so and you may be drawing a lot more than that which would require a regulated power supply module.

Peter

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