Intercom Evidence for SG1
Drawn from the project record at commit 9cb6430
- NeedN4
Know that nothing hears me unless I hold the button, whatever software the box or my computer runs
- HazardH1
The box hears and sends on what the user or someone nearby says while nobody holds the button
- Safety goalSG1
Nothing the box's microphone picks up reaches the computer while nobody holds the button; within 50 ms of the button's release the box sends nothing more
- RequirementHW1
The microphone is powered through the button's contact, so with the button released it has no power, whatever the firmware does
- Designboard
The
/MIC_3V3net, from the button contact SW1 to the microphone MK1 and the on-air light D13.SW1 button contact MK1 microphone D13 on-air light
Evidence
Electrical rules check, schematic
ea481a834d3a70e1 warning at U6 pin 17, not passedintercom#8a31d4a4Exclude the one explained ERC warning: U6's exposed pad on GNDbc836ff59cb6430Passed, 0 open, 1 excluded
Design rules check, board layout
9ab9276e9cb6430Passed, 0 violations, 0 unconnected
Simulation of HW1
4f901b54f2839390.26 ms after the button's release, the microphone's supply is below 1.62 V. Limit 50 ms.
Files at 9cb6430, SHA-256
- brief
8ac337a76ec7 - model
b016345edba6 - schematic
a6b32ad44180 - board layout
bce259cf6036 - pin map
ac4fddc99794



