HX711 odd readings
Posted: Tue Jan 21, 2020 8:11 pm
Ok, this is puzzling me. I've been playing with load cells for the first time, I have 4 cells connected through an HX711 as is apparently the customary practice. If I apply a load the reading from the HX711 changes so all appears well but I have two oddities I don't quite understand.
1. The readings are negative rather than positive, Google didn't give me a clear answer on whether that's expected or not.
2. The output with just the load of the empty weighing platform is either around -130k or around twice that with a small number of random data points outside that range. I captured a reading every second for an hour or so and this is what the trace looks like. There's two clear lines, one at X and one at x*2. What could cause that? If it were random noise I'd blame my soldering but this is clearly not random.
Any assistance gratefully received.
1. The readings are negative rather than positive, Google didn't give me a clear answer on whether that's expected or not.
2. The output with just the load of the empty weighing platform is either around -130k or around twice that with a small number of random data points outside that range. I captured a reading every second for an hour or so and this is what the trace looks like. There's two clear lines, one at X and one at x*2. What could cause that? If it were random noise I'd blame my soldering but this is clearly not random.
Any assistance gratefully received.
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