v2.4

v2.4

Improvements since v2.3

• Add an "output enable" terminal (J10) for use with an emergency stop switch. Outputs are enabled when the terminal is shorted; they are disabled when it is disconnected. See schematic for detailed notes.

v2.3

v2.3

Improvements since v2.2

• Change buck diode to improve Pi regulator efficiency (81% -> 87%), to reduce heat generated when driving a Raspberry Pi 5

v2.2

v2.2

Improvements since v2.1

• Add a slot for the Raspberry Pi camera connector, to allow the ribbon cable to easily pass through the driver board.
• Remove stacking power connector to allow space for the cable slot. If stacking is required, board power inputs should be wired in parallel.
• Fix major error in v2.0 where MOSFET rotations were incorrect
• General manufacturability improvements (component polarity in silkscreen)

v2.1

v2.1

Improvements since v2.0

• Fix MOSFET rotation issue in v2.0
• Add backfeed protection to the Pi power supply
• Improve silkscreen for better manufacturability
• Improve MOSFET switching speed (smaller pullup resistor)

Improvements since v1.0

• Add a camera cable slot to allow easy camera connection on the Raspberry Pi 4 and 5
• Improve silkscreen for easy assembly and maintenance

v2.0

v2.0

Please note this release has a major error (main MOSFETs are rotated incorrectly) and will not switch outputs properly.

Improvements since v1.0

• Significantly rework layout to allow space for instructions on the top. Move most components to the bottom layer.
• Change MOSFETs from TO-220 to a compact SMD footprint.
• Add indicator LED to each output and the power input.
• Switch to generic spring connectors that are PTH rather than SMD; the Wago SMD connectors did not hold up well in use.
• Change diodes from SMA to DO-123F to save space.
• Change most resistors from 0805 to 0603 to save space.

v1.0

Initial prototype.