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

flux

Built the Remote Pico Controller schematic: Pico socket, ESP-01S WiFi UART on GP0/GP1, 9V screw input, 5V + 3.3V regulation, and four independent low-side MOSFET motor channels on GP18–GP21. ERC is clean; remaining DRC/manufacturing findings are expected until layout/routing and real MPN/packages are assigned for generic passives.
Open items:
  • Confirm motor running/stall current before layout.
  • Decide whether to add input fuse, reverse-polarity protection, and TVS clamp.
  • Assign final passive MPNs/footprints before manufacturing.
Suggested next steps:
  1. Add/provision input protection based on expected motor current.
  2. Move to PCB layout and placement.
  3. Set trace widths for V9_MOTOR and each motor channel.
  4. Route and run DRC.
D

dacre

i want the power supply to be via AA batteries . is that possible and if so, include a battery pack part and wire that up as the power source

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
Sign up to send

Files

Schematic

Layout

Preview

Remote Pico Controller thumbnail