Imported from GitHub: octoprobe/tentacle · commit 54fa92a · license MIT

Description

Open source hardware as part of octoprobe

README

Octoprobe Tentacle v0.5

schematics

History v0.4 -> v0.5

• Remove silkscreen: R301, U302, R1401, R1505
• Breadbord pads: Only one ground line to leave more space for DUT-boards
• Breadbord: Enlarged for big boards
• buffering capacitor on HUB+5V
• GPIO Pads equal to Tentacle v3
• LEDS less bright (Green LEDs 2k2 -> 4k7)
• Power DUT via PICO-Infra?
  • • DUT is not powerered when Tentacle is plugged in.
• Power PICO-Probe via PICO-Infra?
  • • PICO-Probe is by default off.
  • • PICO-Probe Boot pin would be controlled by PICO-Infra.
• DUT may be powerered via a jumper
• RP2_INFRA_BOOT via USB Port 2
• RP2_PROBE_BOOT via GPIO
• RP2_PROBE_RUN via GPIO

History v0.5 -> v0.6

• New: Pad for scope ground
• Labels level shifter are currently below the pins and covered by the soldered cables: They should be on top of the pins!
• 2 level shifters
• LED for proberun and probeboot
• DUT was powerered 3V3, now 5V

History v0.6 -> v0.7

• Rename all project files 'pcb_octoprobe' -> 'pcb_tentacle'

• Remove D1501

• R1503 0R -> 1K

• LED_BLUE D201 is an extended part (C189307) - replace by basic part (C2293)

• LED_BLUE LED_0603_1608Metric -> LED_SMD:LED_0805_2012Metric

• LED_GREEN LED_0603_1608Metric -> LED_SMD:LED_0805_2012Metric

• LED_RED LED_0603_1608Metric -> LED_SMD:LED_0805_2012Metric

• LED_RED C2286 -> C2295

• LED_WHITE LED_0603_1608Metric -> LED_SMD:LED_0805_2012Metric

• LED_WHITE C2290 -> C34499

• HUB U302: CFG_SEL[1]

  • Before GND: Self-powered operation enabled
  • Now +3V3: Bus-powered operation

• Allows to replace PICO_PROBE with a mcu connected wia soldered USB. USB pads have been added.

History v0.7 -> v0.7 2026-01-04

• PCB -> File -> Board Setup -> Design Rules -> Pre-defined Sizes -> Vias

  Label	Before	New
  Diameter	0.4mm	0.45mm
  Hole	0.2mm	0.3mm

• PCB -> File -> Board Setup -> Design Rules -> Constraints -> Minimum through hole

  • 0.2mm Before
  • 0.3mm New

• PCB -> File -> Board Setup -> Design Rules -> Constraints -> Minimum annular width

  • 0.1mm Before
  • 0.075mm New

History v0.7 -> v0.7.1 2026-02-18

Bug: README_insufficient_bus_power.md

• U302 (hub) CFG_SEL

  • Before: connected to +3V3
  • After: connected to GND

• J201 Conn_02x05

  • Silkscreen with wrong GPIO numbers