ADS1115 read return always 32767
simeondmr opened this issue · comments
Hello,
I'm using ADS1115 and when I call read method like this: block!(self.adc.read(&mut channel::SingleA0));
the function return always: 32767, and this is really strange.
When I call the read method like this: block!(self.adc.read(&mut channel::DifferentialA0A1));
it seems to work correctly.
The dependencies that I'm using are:
ads1x1x = "0.2.1"
i2cdev = "0.4.4"
embedded-hal = "0.2.4"
linux-embedded-hal = "0.3.0"
nb = "1.0.0"
Please could you help me with this problem?
Thanks
Simeon
What you describe is possible depending on how your pins are electrically connected and your choice of full scale range.
Please try building a voltage divider as described here:
https://blog.eldruin.com/ads1x1x-analog-to-digital-converter-driver-in-rust/
Remembering to add the line adc.set_full_scale_range(FullScaleRange::Within6_144V).unwrap(); for 5V.
And then see if you have the same problem.
Hello,
Ok, I will build a voltage divider and I will let you know!
Thanks.
Simeon
Hello,
I have done the voltage divider and the code work correctly.
The problem was that I forgot the line: adc.set_full_scale_range(FullScaleRange::Within6_144V).unwrap();
Thanks for your time.
Simeon