I bought 2 PCBs assembled from JLCPCB. got the first one into my versatile tractor, and its working great. Had all the minor teething problems i would have expected for setting something up like this my first time, but I got it all working good.
Getting the second one going though has been a little weird. I cant get the wheel angle sensor to work. The sensor is working as it should I believe, need to pull it off to confirm for sure, but im getting about 3 volts at pin 2 all the time without the ampseal plug even in. Is this normal? its even there when none of the teensy, imu, motor driver, or the UBLOX are in place and testing by supplying 12v to pin 22 and ground through pin 4 on the desk.
I’ll pull the WAS (land rover sensor) off the tractor to test it properly, but i dont think that is the issue given the voltage is still there when its on the test bench. Figured id ask here first to see if I’m even looking in the right place.
Bought the landrover type at the start, bought in pairs & broke them in getting setup.
The next pair I got gave a bit of bother, after a lot of hassle with the first 1 I broke it, the second was no better so I tested it with a meter & it was a dud, so just tried the 1 that had broken & it was a bit intermittent, they came from ebay, so the next I got on amazon & tested before fitting, been fine since.
So test first to rule that out maybe.
1 Like
Check the plug is wired correctly
Sometimes the pre wired plug is wrong
The wiring diagram for thess is on the github documentation if you do a search to rule that out
It could also be a faulty ads1115 on the board
You could add an external ads1115 using the header pins if the one on the board has died
Its definitely not the WAS. Got that checked, and its definitely in spec and working and was wired correctly I will be checking my future sensor purchases for sure now though, so thanks for your comment @dumbstruck!
Poking around with the multimeter, I found that there are two distinct voltages coming from the ADS1115 chip on the board. On the pins for ai0 and ai1 it will read between 2.9v, and 4.1, but they are two distinct voltages, ususally about .5v apart and dont match up with any of the 3.3 v connections. I cant find any soldering shorts anywhere else. Does anyone know if this is the normal behaviour?
They hold steady each time i check them, but can vary between power cycles. Im assuming that because these are supposed to be Analog In posts according to the chip manufacturer, they are not supposed to be emitting anything and i got a bad/fried my ADS1115 chip? (like @del_boy said, I wrote this out but did not post it last night i guess)
I actually tried this board for assembly first, but couldnt get it to work and just jumped to the other one, but I think that this was my problem from the get go. I also have a ADS1115 from ADafruit around from when my Dad tried tackling this before, so thats awfully convenient, but I’ll still have to remove the old chip so that it doesnt mess with anything.