This is the tip of the sensor which is detachable from the main body.
Since the connections look like some standard Dupont pin in 2 rows (like raspberry) I was wondering if someone did already hacked these type of device.
I'm pretty sure that in the main body might be other electronics for the sensors but I don t want to cannibalize my working pen and possibly kill it. Did anyone already opened it to see what's inside?
Is it possible to use only the tip and feed those water parameters into Arduino or esp?
The connector is probably intended for programming the chip, but there may be pins that report the measurements using a serial protocol. If you have a logic probe or oscilloscope, it won't damage the device to make some measurements.
You will have to do more investigation - specifically: what exactly is in the tip part?
If you find a PCB in there, maybe you can reverse engineer it to at least know what signals could be present on which of the connectors. But maybe it's only the sensors, and you have to find out how to read those.
By the way, it's truly a 3-in-1. TDS and salinity are calculated from the measured EC, using certain assumptions - probably that the solution is only water with NaCl, which is actually a very good approximation for natural water (typical fresh, brackish or salty water).
Well, untill I understand what those pins are, we will never know. This tool you linked could be very helpful. Also I don't have a oscilloscope and to be honest neither the knowledge to use it properly. That's why I tried to ask here if someone already did the dirty job.
That's problem: I don't really know either what's inside the tip or inside the main body because for now I never got that brave to fully disassemble both the tip or the body. Also I could not find anything online, not even a picture to see if there's some kind chip, ADC...
