A back door sensor with a coin Cell and a reed contact to detect the state of the back door
This is the page url: /domotica/Nodes/BackDoorSensor/
Principles
- Limit power consumption:
https://forum.mysensors.org/topic/1287/door-window-sensor-consuming-more-power-when-closed/5
- For the reed contact pin D3, a 3.3 MOhm pull up resistor is used and the internal pull-up is disabled.
- Use an Arduino Pro Mini 3V3 to keep the cost down (compared to the sensebender).
- Use no debouncing, and not the software debouncing library, since that one is guaranteed to give trouble combined with sleep mode.
- The Arduino 3.3V 8mhz can handle down to roughly 2.8V and the Nrf24l01+ down to 1.9V. Hence the batteries can not be NiMH rechargeables - Alkaline or Lithium required. We use a CR2450 coin cell which gives 3V.
Future extensions
- Add a Si7021 module to measure temperature and humidity.
The result
The SMD solder work
The connection of the reed contact
Wiring: supply, resistor, capacitor
Used Components
- NRF24L01+SMD
- Reed contact with resistor 3M3 Ohm
- ArduinoProMini3V modified to reduce current consumption for battery supply
- Si7021Module optional
- AdapterProMiniForNrfSmd
- Capacitor 10uF 10V solid low ESR
Wiring
| NRF24L01+ Function | Arduino Mini Pro pin |
|---|---|
| +3.3V | connected with wire |
| GND | connected with wire |
| CE | D9 |
| CSN | D10 |
| SCK | D13 |
| MOSI | D11 |
| MISO | D12 |
| IRQ | Not Connected |
| Component | Pin | Wire/Component | Pin | Component |
|---|---|---|---|---|
| Arduino Pro Mini | VCC | orange | plus | Battery CR2450 |
| Arduino Pro Mini | GND | black | min | Battery CR2450 |
| Arduino Pro Mini | GND | Reed Contact | D3 | Arduino Pro Mini |
| Arduino Pro Mini | VCC | Resistor 3M3 Ohm | D3 | Arduino Pro Mini |
Programming
This project uses Platformio, see platformio.ini
Use the following commands:
$ pio run $ pio run -t upload $ pio run -t monitor
Code at: BackDoorSensor.ino
First sign of life
__ __ ____
| \/ |_ _/ ___| ___ _ __ ___ ___ _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| | | | |_| |___| | __/ | | \__ \ _ | | \__ \
|_| |_|\__, |____/ \___|_| |_|___/\___/|_| |___/
|___/ 2.3.2
104 MCO:BGN:INIT NODE,CP=RNNNA---,FQ=8,REL=255,VER=2.3.2
167 TSM:INIT
174 TSF:WUR:MS=8000
190 TSM:INIT:TSP OK
200 TSF:SID:OK,ID=14
212 TSM:FPAR
223 ?TSF:MSG:SEND,14-14-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
260 TSF:MSG:READ,0-0-14,s=255,c=3,t=8,pt=1,l=1,sg=0:0
288 TSF:MSG:FPAR OK,ID=0,D=1
595 TSF:MSG:READ,13-13-14,s=255,c=3,t=8,pt=1,l=1,sg=0:1
825 TSF:MSG:READ,10-10-14,s=255,c=3,t=8,pt=1,l=1,sg=0:1
1071 TSF:MSG:READ,7-7-14,s=255,c=3,t=8,pt=1,l=1,sg=0:1
2263 TSM:FPAR:OK
2271 TSM:ID
2277 TSM:ID:OK
2285 TSM:UPL
2304 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2340 TSF:MSG:READ,0-0-14,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2369 TSF:MSG:PONG RECV,HP=1
2385 TSM:UPL:OK
2394 TSM:READY:ID=14,PAR=0,DIS=1
2422 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2461 TSF:MSG:READ,0-0-14,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2500 TSF:MSG:SEND,14-14-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.3.2
2547 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
2584 TSF:MSG:READ,0-0-14,s=255,c=3,t=6,pt=0,l=1,sg=0:M
2650 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=11,pt=0,l=16,sg=0,ft=0,st=OK:Back Door Sensor
2697 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.0
2750 TSF:MSG:SEND,14-14-0-0,s=1,c=0,t=0,pt=0,l=18,sg=0,ft=0,st=OK:BDS - Reed contact
2793 MCO:REG:REQ
2838 !TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=NACK:2
2877 TSF:MSG:READ,0-0-14,s=255,c=3,t=27,pt=1,l=1,sg=0:1
2906 MCO:PIM:NODE REG=1
2920 MCO:BGN:STP
Back Door Sensor 1.0 - Online!
2938 MCO:BGN:INIT OK,TSP=1
Wake up - now minute -1
2975 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=1,st=OK:1
Reed contact changed without interrupt - now open
3037 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3063 TSF:TDI:TSL
3074 MCO:SLP:WUP=1
3084 TSF:TRI:TSB
3104 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:0
Reed contact changed - now closed
3158 MCO:SLP:MS=100,SMS=0,I1=255,M1=255,I2=255,M2=255
3186 TSF:TDI:TSL
3196 MCO:SLP:WUP=-1
3207 TSF:TRI:TSB
Wake up - now minute 0
3239 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:0
Reed contact repeat last message - now closed
3299 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3328 TSF:TDI:TSL
3336 MCO:SLP:WUP=1
3346 TSF:TRI:TSB
3362 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact changed - now open
3416 MCO:SLP:MS=100,SMS=0,I1=255,M1=255,I2=255,M2=255
3442 TSF:TDI:TSL
3452 MCO:SLP:WUP=-1
3463 TSF:TRI:TSB
Wake up - now minute 1
3495 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact repeat last message - now open
3555 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3584 TSF:TDI:TSL
3592 MCO:SLP:WUP=1
3602 TSF:TRI:TSB
3618 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:0
Reed contact changed - now closed
3672 MCO:SLP:MS=100,SMS=0,I1=255,M1=255,I2=255,M2=255
3700 TSF:TDI:TSL
3710 MCO:SLP:WUP=-1
3721 TSF:TRI:TSB
Wake up - now minute 2
3753 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact changed without interrupt - now open
3815 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3844 TSF:TDI:TSL
3852 MCO:SLP:WUP=-1
3864 TSF:TRI:TSB
Wake up - now minute 3
3901 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact repeat last message - now open
3960 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
3987 TSF:TDI:TSL
3997 MCO:SLP:WUP=-1
4007 TSF:TRI:TSB
Wake up - now minute 4
4040 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact repeat last message - now open
4100 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
4126 TSF:TDI:TSL
4136 MCO:SLP:WUP=-1
4147 TSF:TRI:TSB
Wake up - now minute 5
4179 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact repeat last message - now open
4239 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
4265 TSF:TDI:TSL
4276 MCO:SLP:WUP=-1
4286 TSF:TRI:TSB
Wake up - now minute 6
4319 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
4366 TSF:MSG:SEND,14-14-0-0,s=255,c=3,t=0,pt=1,l=1,sg=0,ft=0,st=OK:104
Wake up - a long period has passed - update all data.
4431 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
4460 TSF:TDI:TSL
4468 MCO:SLP:WUP=1
4478 TSF:TRI:TSB
4495 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:0
Reed contact changed - now closed
4548 MCO:SLP:MS=100,SMS=0,I1=255,M1=255,I2=255,M2=255
4577 TSF:TDI:TSL
4587 MCO:SLP:WUP=-1
4597 TSF:TRI:TSB
Wake up - now minute 0
4626 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:0
Reed contact repeat last message - now closed
4685 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
4712 TSF:TDI:TSL
4722 MCO:SLP:WUP=1
4732 TSF:TRI:TSB
4749 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact changed - now open
4800 MCO:SLP:MS=100,SMS=0,I1=255,M1=255,I2=255,M2=255
4829 TSF:TDI:TSL
4839 MCO:SLP:WUP=-1
4849 TSF:TRI:TSB
Wake up - now minute 1
4882 TSF:MSG:SEND,14-14-0-0,s=1,c=1,t=16,pt=2,l=2,sg=0,ft=0,st=OK:1
Reed contact repeat last message - now open
4941 MCO:SLP:MS=60000,SMS=0,I1=1,M1=1,I2=255,M2=255
4968 TSF:TDI:TSL
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