NX-8-alarm

(c) 2019-2020 HomeACcessoryKid@gmail.com

• This example makes an NetworX NX-8 alarm system homekit enabled.
• The alarm can switch between off, away and sleep
• the individual sensors are set out as individual motion sensors accessories
• It uses any ESP8266 with as little as 1MB flash.
• read nx8bus.h for more intructions
• UDPlogger is used to have remote logging
• LCM is enabled in case you want remote updates

The NX-8 bus

• This is a driver for the NX8 bus based on a 4512 bus driver with a fixed address selected and that pin gets 0 V input
• The inhibit pin 15 is connected to a NPN driver with 10k collector to 12V bus power and by a base 180kohm to the tx pin
• The Zoutput pin 14 is connected to the bus dataline. So tx=0 is high-Z and tx=1 is zero out. The bus itself is 12v idle
• The rx pin is reading the bus by a divider of 10k to ground and 33k to the dataline
• Some credit goes to the softuart writers on which this is loosly based

Experience report with NX-6-v2 from a happy maker

Change history

0.6.1 deferred alarm_init until homekit is paired

0.6.0 PIN code stored in volatile RTC user memory and stack adjustment

0.5.3 increased stack sizes of tasks after instability

0.5.2 reduced stack sizes of tasks target and logsend

0.5.1 reduced various stack sizes of tasks

0.5.0 added task statistics readout for high water mark of various tasks

0.4.13 removed stealing heap for long term stability test

0.4.12 changed heap report in json code and stealing 8k heap

0.4.11 using memory branch and stealing 7k heap

0.4.10 reduce ram by 5k to test memory pressure and changed remove code

0.4.9 removing old sockets from same IP

0.4.8 also report address of closing connection

0.4.7 make homekit report existing connections when new connection arrives

0.4.6 changed to debug line in json_end and json_free

0.4.5 added debug line in write_characteristic_json of esp-homekit/server.c

0.4.4 make heap probe table based and make H:M:S timeoutput

0.4.3 set heap probe factor to 4/5 instead of 2/3

0.4.2 crude routine to monitor the size of the biggest available heap block

0.4.1 fixed monitor report format

0.4.0 removed NTP time but count 32bit microsecond wraparound=71minutes

0.3.9 tuning heap info, ordblks doesn't work

0.3.8 added NTP time and tuned heap info

0.3.7 improved monitor with heap info

0.3.6 added a monitor task to show heap and wifi channel

0.3.5 reverted UDPlog change and homekit update bugfix

0.3.4 started UDPlog from the very beginning

0.3.3 made bus messages DEBUG print only and fix PIN -1 mode

0.3.2 changed PIN feedback to -1 and introduced debug switch

0.3.1 added all printf to UPDlogger

0.3.0 updated all submodules to april 2020 versions

0.2.2 the first operational version