Modifying IKEA Tradfri Sensor (E1525) timeout help wanted
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I think I may have screwed up one of the earlier measurements. I am using a better meter now, and I got this: https://imgur.com/a/AQk22sR
The Blue pin, which I originally said was connected to the VDD pin appears to actually be connected to the ground shield over the chip - I got a reading of zero. The Red pin, I got a reading of 3V (there abouts) and this is the one connected to the VDD pin on the E93196. Turning the potentiometer did not change the voltage on this.
I remeasured the resistance from the ground leg of the potmeter to top green dot is 77K, bottom green dot is zero when at 1 minute, both are at 77K when at 15 minutes
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Voltages:
All 3 potmeter legs to MCU (blue): 2.9V - Does not change when potmeter moved
All 3 potmeter legs to MCU (red): ~0.2mV-0.3mV - Does not change when potmeter movedResistance:
Top green on potmeter to MCU (red): 67K (turning dial does not change)
Bottom green dot on potmeter to MCU (red): 67K at max time, 110K at minimum time
Unmarked leg to MCU (red): 110K and does not change when potmeter moved -
It's confusing me.
The potmeter has three legs. One is positive supply (VDD probably), one is ground and the other one should change voltage of you move the dial. You should measure between ground and the point you want to measure.Edit
Now you should find out where this third leg is going to -
Yeah sorry about that. My inexperience is probably exacerbating things :grimacing: thank you for putting up with me ;)
I am looking at the potmeter, and I think I can fairly say the legs are like this: https://imgur.com/a/1bTBnUo
So with one probe on the variable leg, where to I test with the other probe?
It looks like the variable leg first goes to TP5_1, then to TP5_2, then to the MCU, but it is not clear which pin: https://imgur.com/a/hbgOOBU
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@bob21 said in Modifying IKEA Tradfri Sensor (E1525) timeout help wanted:
So with one probe on the variable leg, where to I test with the other probe?
Always to ground
@bob21 said in Modifying IKEA Tradfri Sensor (E1525) timeout help wanted:
It looks like the variable leg first goes to TP5_1, then to TP5_2, then to the MCU, but it is not clear which pin: https://imgur.com/a/hbgOOBU
With the continuity function of your multimeter (when it beeps if you short the probes) you can trace where it goes to.
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My meter doesn't beep, but I get a reading of 0.1 between TP5_2 and the second pin from the right, this seems to be the lowest reading by far: https://imgur.com/a/RLFyOBP is this a sign that it is connected here?
But, when I set the potmeter to minimum the Voltage = 2.95, and this doesn't change... the potmeter set to max is still 2.95V... :disappointed:
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According to the pics I found, the MCU is a Silicon Labs Mighty Gecko EFR32MG1P132GI.
With 1 probe to ground I tested:
Pos leg with dial at 1 minute (min): 2.97V
Pos leg with dial at 15 mins (max): 2.97V
Neg leg with dial at 1 minute (min): 2.96V
Neg leg with dial at 15 mins (max): 2.95V
Variable leg with dial at 1 minute (min): 2.96V
Variable leg with dial at 15 mins (max): 2.97VSeems like a very small change.. is this enough of a change to be useful?
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Hello everyone!
Based on the quite useful reverse engineered schematic at https://hackaday.io/project/174308-tradfri-pir-motion-sensor-hacking the measurements were somewhat sabotaged by the 2N7002 (see Connors comment "enables voltage dividers only when triggered").
the transistor is controlled by the Elmos E931.96 PIR motion controller IC.
The latter is programmable by the IKEA TRÅDFRI ICC-1 module's EFR32MG1P132F256GM32 MCU.
E.g.2. Blind Time Ignores motion after the interrupt output is switched back to 0 Range: 0.5s... 8s. The blind time is [Register Value] *0.5s 3. Programmable pulse counter 1... 4 pulses with sign change in between Amount of pulses = [Register Value] + 1 4. Window time For noisy environments 2s... 8s window Window time = [Register Value] * 2s + 2shttps://github.com/basilfx/TRADFRI-Hacking gives a good overview on that.
What is the issue with tose 60s?
