I´m trying to hack a wheelchair controller. I planning to change joystick pod of controller with signals from an Arduino.
I already make my shield with 2 DAC that supplies both axes .
Its works but crashes after a few seconds (random). Im looking the josytick pod circuit so I can figure out what is happening. What electronic components are these?
1- resistor array ?
2-Diode ?
3-capacitor ?
4- resistor
Regards,
D50800-03.pdf (184 KB)
I also think so but it's hard to say with that bad photo.
Pelle
Hi, from the pdf I'd say that the ICs are possibly Hall Effect devices, the joystick itself would have possibly 2 or four magnets mounted on it that line up with these ICs.
The distance between the IC and the magnet gives you analogue output.
Tom.... 
I would try looking at the output with a multimeter before worrying about
how it works - first establish if its working, and if so move your attention to
your DAC shield...
MarkT:
I would try looking at the output with a multimeter before worrying about
how it works - first establish if its working, and if so move your attention to
your DAC shield...
I dont know where the problem is. If it is in centre pin or in X / Y pins. As I have seen other hacks with VSI controller with DACS (no centre pin required) I assume this where ok.
Yes, Im starting to think that my problem is not on how I replicate the joystick pod and is something else. Maybe noise somewhere.
MarkT:
I would try looking at the output with a multimeter before worrying about
how it works - first establish if its working, and if so move your attention to
your DAC shield...
I tested:
VS with centre = 1.1 Kohm
GND with centre = 1.1 Khom
Voltage of Vs supply:
standby 4.9 V aprox.
throttle 5.10 -5.20 aprox
then I remove hall sensors and get:
VS with centre = 2.2 KOhm
GND with centre = 2.2 KOhm.
