kopia lustrzana https://github.com/Qyon/STM32_RTTY
beginning of reverse engineering of temperature and humidity sensors
rodzic
30604ae0bb
commit
7164193af9
|
@ -0,0 +1,73 @@
|
||||||
|
DF8OEs investigations about sensor access
|
||||||
|
------------------------------------------
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Temperature and humidity sensor directly goes to STM. There is no interface
|
||||||
|
chip to handle them - all is done by software.
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
Pinout of sensor boom:
|
||||||
|
----------------------
|
||||||
|
1 - GND
|
||||||
|
2 - temperature sensor (1)
|
||||||
|
3 - GND
|
||||||
|
4 -
|
||||||
|
5 - GND
|
||||||
|
6 -
|
||||||
|
7 - GND
|
||||||
|
8 -
|
||||||
|
9 -
|
||||||
|
10 - GND
|
||||||
|
11 -
|
||||||
|
12 - GND
|
||||||
|
13 - temperature sensor (2)
|
||||||
|
14 - GND
|
||||||
|
15 - GND
|
||||||
|
16 - GND
|
||||||
|
17 - GND
|
||||||
|
18 - GND
|
||||||
|
19 - GND
|
||||||
|
20 - GND
|
||||||
|
|
||||||
|
Counted from left to right if you position flexsensor in front of you, pins near
|
||||||
|
to you, sensor away from you, copper upside
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
All connections leading to sensor boom do have corresponding test points on PCB:
|
||||||
|
--------------------------------------------------------------------------------
|
||||||
|
Position PCB in front of you, flatconnector upside, sensor boom showing away from
|
||||||
|
you, TX antenna leading to you. I draw connector as a row of "+++". Testpoints are
|
||||||
|
small round copper isles (numbers correspond to sensor boom, G == GND, ? == unknown):
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
11
|
||||||
|
+++++++++++++++++++++++
|
||||||
|
|
||||||
|
G 4
|
||||||
|
|
||||||
|
|
||||||
|
8 6 2
|
||||||
|
|
||||||
|
|
||||||
|
13 ? 9
|
||||||
|
|
||||||
|
|
||||||
|
Investigations about temperature sensor:
|
||||||
|
----------------------------------------
|
||||||
|
Temperatrue sensor is resistance-based. If you insert a resistor between
|
||||||
|
pin2 and pin13 of flatconnector, the following telemetry is transmitted:
|
||||||
|
|
||||||
|
330R --> -168°
|
||||||
|
560R --> -113°
|
||||||
|
820R --> -52°
|
||||||
|
1K --> -4.1°
|
||||||
|
1.5K --> 121°
|
||||||
|
2.2K --> 319°
|
||||||
|
|
||||||
|
|
||||||
|
2 be continued
|
Ładowanie…
Reference in New Issue