RDMA

RDMA-PCB

Rpi Dead Man Alarm - PCB and 3D case - Occupancy Monitoring - Raspberry Pi hat

24-RDMA-Case-04.jpg

23-RDMA-Case-03.jpg

07-RDMAweb-02.jpg

Video of it in action

V 1.0 29/05/2020 - Initial Release

PCB Board Used

Ready to use PCB Board

https://www.skstore.com.au/electronics/pcb/RDMA

PCB Design Files / gerber files

RDMA-PCB

3D Printed Case design files / STL

RDMA-PCB

https://www.thingiverse.com/thing:4406335

https://www.myminifactory.com/object/3d-print-123446

FYI Gerber files are in the release section

https://github.com/SkullKill/RDMA-PCB/releases

more pictures in the wiki

https://github.com/SkullKill/RDMA-PCB/wiki

18-RDMA-Wiring-01.jpg

10-RDMA-FrontR-V1.0.jpg

15-RDMA-Back-BoardOnly-V1.0.jpg

Schematics

09-RDMA-schematics-v1.0.jpg

MecanicalDrawing

1 to 1 scale

https://github.com/SkullKill/RDMA-PCB/blob/master/Case/RDMAcase-MecanicalDrawing-V1.0.pdf

please use PDF version, and print to scale

Code Used

RDMA

PCB features

• Step down DC DC regulator (12v will power both the pi and PIR sensor)
• Input has a self reset fuse, and reverse polarity protection.
• Physical on/off switch when powered via 12v
• Back power protection to allow pi to provide power.
• RTC clock
• Segment display (to display time left before alarm is triggered)
• Ability to trigger 3 X 5V object (e.g buzzer or lights) (will probably only populate one for the buzzer)
• The above trigger can be set to either 5V or 12V.
• Built in buzzer (to alert operator 1 min before alarm is triggered and SMS are sent out)
• 1-wire rail (possibility to add a number of DS18B20 temperature sensors)
• 2 physical button, one to manually reset the timer, or if hold for a few sec, will extend the timer once. Other button is to shutdown/unused.
• Ability to add external buttons.
• 1 configurable status light. (on when the service is running)
• All button, including PIR input has a physical denounce to eliminate noise/false alarm.
• EEPROM as per pi hat requirement (will probably not populate)
• Screw terminal for all connectors. No crimping required.

A 12V , 1A PSU should work, however, to be on the safe side, use a 12V, 2A PSU

Standard wall mount sensor DG65 https://www.paradox.com/Products/default.asp?CATID=8&SUBCATID=79&PRD=1389

swivel mount for DG65 https://www.paradox.com/Products/default.asp?CATID=8&SUBCATID=81&PRD=456

if the service is not running after restarting, GPIO 8 would be on, which would make the buzzer turn on. to turn it off, use the following.

gpio readall
gpio -g mode 8 output
gpio -g write 8 0