robert-hh / ads1x15 Goto Github PK

data = array("h", 0 for _ in range(_BUFFERSIZE)) <-error " generator has to be placed in parentheses if not the only argument."

data = array("h", (0 for _ in range(_BUFFERSIZE))) <- accepted

The 'machine' module was installed but is not detected. (sudo) pip install machine.
Installation process normal and concludes correctly, still, a "No module named machine" occurs.

Running Python 2.7 on Raspberri Pi Raspbian Stretch (Debian), current verison.
I leave the module file, 'ads1x15.py' in the same directory as the test script taken from github.
Should I have made some other preparation for using the module?

Hi Robert, I'm using your library with a Pycom Wipy 3.0 in order to catch data from 3 sensors.

Sensor1 must be read every 10ms, sensor2 and sensor3 every 100ms.
I'm using 4 as a rate (_DR_1600SPS, # 1600/128 samples per second) and the conversion time is more or less 10ms. When i reach 100ms I got a delay since every conversion time is accumulated for the 3 sensors. In fact, sensor1 is sampled every 11ms, but at the tenth sampling it loses 30ms. Sensor2 and 3 are sampled every 130ms. Could you suggest me a way to reduce this delay?

Thank you!

I am testing your sample code for continuous sampling trigger by the ADC, however, there are a couple of things that are not clear. One of them is the irq attribute of Pin. Is the line

irq_pin.irq(trigger=Pin.IRQ_FALLING, handler=sample_auto)

supposed to work on ESP32 (i.e. LoPy4 + pysense)? In my case, it does not:

AttributeError: 'Pin' object has no attribute 'irq'

That said, I modified a few lines to instantiate the I2C bus, and I can manage to run your example using the callbackmethod in Pin. However, it does not seem to actually change the data rate of the ADC (I get around 34 sps, no matter the rate -- though I am executing this in REPL). You mentioned you reach 252 sps? Were you able to test different rates?

Help appreciated.

Hi Robert, I'm trying to use this library for the 2-Channel 4-20 mA Current Loop Receiver 16-Bit ADS1115 I2C Mini Module with a Lopy, but I do not know if it's works. can you give some guidance to use it.
This is the module:
https://store.ncd.io/product/2-channel-4-20-ma-current-loop-receiver-16-bit-ads1115-i2c-mini-module/

Hello, I'm trying to implement an transimpedance amplifier in a sensor circuit and the ADC I'll use is the ADS1114. By reading the registers page in the datasheet and by going through the hole python library, I don't know if this library may be compatible with this specific ADC. Could it be compatible or should I create a new library only for that ADC?

Hi here is the function I used for sampling at 860s/s.
i2c = I2C(1,scl=Pin(15), sda=Pin(14), freq=400000) ads = ads1x15.ADS1115(i2c, addr, gain) def sample(adc = ads.read_rev, data=data, timestamp = timestamp, voltage=ads.raw_to_v): global index_put, irq_busy for i in range(860): if irq_busy: return irq_busy = True if index_put < _BUFFERSIZE: ads.set_conv(7, 0) data[index_put] = ads.read_rev() index_put += 1 i +=1 irq_busy = False irq_busy = False index_put = 0
Here is what I get with a 40Hz Sine:

I don't know if it is my ADC or a problem in my code!
Any response is greatly appriciated :)

Hello,
for the ads1015 i have a problem with your driver. I had to delete the gain on this
ads = ads1x15.ADS1015(i2c, addr)
by adding the gain i have this issue
function takes 4 positional arguments but 5 were given