I want a simplest possible schematic that allows m...

flux

I’ll check suitable AA battery-holder options, then update the schematic so the battery pack is the 9V input source and verify the power ERC afterward.

flux

Yes — for the existing 9V motor rail, the right AA approach is six AA cells in series. I didn’t find a single 6×AA holder in the library, so I’m using a 4×AA holder plus a 2×AA holder wired in series for 9V nominal alkaline output.

flux

Implemented the AA battery power update: added BT1 4×AA + BT2 2×AA in series as a 6×AA pack, wired to V9_MOTOR/GND through restored battery input terminal J2, and kept the holders as external/off-board parts. Updated the project files and verified ERC plus key placement/DRC checks are clean.
Open items:
  • 6× alkaline AA = ~9V nominal; 6× NiMH AA = ~7.2V nominal, so 9V motors may run slower on rechargeables.
  • Confirm motor stall current and AA cell discharge capability before relying on four motors at once.
Suggested next steps:
  1. Add an input fuse/polyfuse for battery short-circuit protection.
  2. Add reverse-polarity protection for the battery input.
  3. Re-check layout/routing with the restored J2 battery connector.
Add protections and verify
Add input fuse
Add reverse protection
Check battery current
Re-check layout
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Remote Pico Controller thumbnail
Raspberry Pi Pico HAT for WiFi communication and independent control of up to four 9V motors from GPIO GP18-GP21.

Properties

Properties describe core aspects of the project.

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