Difference between revisions of "Continuity Tester"
From Hackstrich
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== Rev001 Issues == | == Rev001 Issues == | ||
| − | * Holes for jacks are way too small | + | * Holes for jacks are way too small (addressed in ECO A) |
* Footprint for trimmers fits, but is way way oversized | * Footprint for trimmers fits, but is way way oversized | ||
| + | * LED footprints are backwards (anode/cathode swapped, addressed in ECO B) | ||
| + | * Beeper/LEDs respond "analogly" due to the capacitor on the TRIGGER line | ||
| + | ** Need to add a Schmitt trigger or something similar to make this sound/look nicer | ||
| + | * Current draw idle is a bit higher than I'd like, should try to optimize this further | ||
| + | * Duty cycle control isn't really useful, should reevaluate need for it in Rev002 | ||
| + | == Rev001 ECOs === | ||
| + | * A - Trim legs on both jacks slightly to enable them to fit through the holes. | ||
| + | * B - Mount LEDs upside down to work around the reversed footprint. | ||
| + | |||
| + | == Current Draw == | ||
| + | * Rev001 w/ ECO A+B | ||
| + | ** Idle - 465uA | ||
| + | ** Beeper - 1.5mA | ||
| + | ** LEDs - 3mA | ||
[[Category:Current Projects]] | [[Category:Current Projects]] | ||
Revision as of 16:45, 12 January 2018
I want to build a continuity tester that's fast, tiny, and can attach to a board I'm reversing so I don't need full multimeter when reversing boards away from a desk. The hardware files for this can be found on GitHub at sarahemm/continuity_tester.
Status
- 2018-01-11: Received PCBs and parts, started assembling.
- 2017-12-13: Completed PCB design, sent to OSH Park for manufacturing.
- 2017-12-11: Started putting idea together after spending lots of hours reversing for the DMS project. BOM and schematic done, PCB layout in progress.
Features
- Fast, latching to catch quick pulses as probe is dragged along multiple pins.
- Visual/audio switchable options
- Lasts a long time on a CR2032 or similar
- Clips or magnets to a board I'm working on to save having another thing to put somewhere.
Rev001 Issues
- Holes for jacks are way too small (addressed in ECO A)
- Footprint for trimmers fits, but is way way oversized
- LED footprints are backwards (anode/cathode swapped, addressed in ECO B)
- Beeper/LEDs respond "analogly" due to the capacitor on the TRIGGER line
- Need to add a Schmitt trigger or something similar to make this sound/look nicer
- Current draw idle is a bit higher than I'd like, should try to optimize this further
- Duty cycle control isn't really useful, should reevaluate need for it in Rev002
Rev001 ECOs =
- A - Trim legs on both jacks slightly to enable them to fit through the holes.
- B - Mount LEDs upside down to work around the reversed footprint.
Current Draw
- Rev001 w/ ECO A+B
- Idle - 465uA
- Beeper - 1.5mA
- LEDs - 3mA
