The ALERT/RDY (2) pin was left disconnected on the board. This results in the requirement to poll the board. You cannot hook the ALERT/RDY pin to an GPIO and use it as a interrupt....
JaneYu 2019-08-10 01:58:23 8 Views13 Replies The ALERT/RDY (2) pin was left disconnected on the board. This results in the requirement to poll the board. You cannot hook the ALERT/RDY pin to an GPIO and use it as a interrupt. The requirement to poll the ADC results in higher SOC resource consumption and lower SPS. Can you put the ALERT/RDY on a header so it can be connected?
The ~555mV on all channels is due to there not being a pulldown on the A0-A3 in. I placed a 62k resistor to ground on each A0, A1 etc and I get 0V when nothing is connected. Didn't really do any math on the resistor value, so have fun with that part.
JaneYu Yes, the list you listed above are all compatible. You can choose ESP32 as your board.
https://www.dfrobot.com/pro...
JaneYu Hi everyone, I started using this product a few days ago to retrieve data from a connected sensor and write the measurements into a csv file. This works well but it looks like I am only logging at around 8-10 Hz, where my sensors' value would need to be read at minimum 50 Hz. Are you aware of material limitations on your product ? I am using a Raspebrry Pi Zero W to achieve it, maybe it could come from there as well (or from my code of course). Thanks in advance !
JaneYu We think the limitation is the Python code.
As a relatively high-level language, Python's execution speed is relatively slow.
You can try to print out the execution time of each loop to determine whether your python code can execute at 50Hz
There are a lot of wait statements in the python function library as well as the code itself. If you decrease the time on those you may be able to get a higher frequency result.
How do i connect my sensor to this device? does anyone have a diagram?
JaneYu Hi,
I bought a 16 bits adc module recently, and I see that the values are in millivolts (in int16_t in the library from 0 to 6143).
How to get the 16 bits resolution (a resolution of 0.0078125mV) ? and not only 1mV whatever the measurement range (even in eGAIN_SIXTEEN) ?
unless I didn't understand something...
JaneYu , would love to check.
I am currently using a 4-20 mA liner sensor which gets its power from a 24 V Power Source. I plan to attach a 250 ohm resistor to the current output of this sensor.
From there I wish to read the voltage on my raspberry pi. As per ohm's law, I will get a voltage reading from the resistor which is proportion to the current. Hence 4mA will give 1 V , while 20mA will give 5v.
So my question is, will I be able to read external voltages on the ADC module ? as I'm using an external power source to power the sensor instead on the local power source from the ADC module
JaneYu Hi, would love to check.
I am currently using a 4-20 mA liner sensor which gets its power from a 24 V Power Source. I plan to attach a 250 ohm resistor to the current output of this sensor.
From there I wish to read the voltage on my raspberry pi. As per ohm's law, I will get a voltage reading from the resistor which is proportion to the current. Hence 4mA will give 1 V , while 20mA will give 5v.
So my question is, will I be able to read external voltages on the ADC module.?
JaneYu Bonjour,
Votre module ads115 (dfr0553) fonctionne très bien, mais ne peut utiliser que 2 adresse i2c (48 et 49).
Est-ce que vous envisagez de modifier votre produit pour pouvoir utiliser les 4 adresses possibles (48, 49, 4A et 4B), comme c'est possible sur votre module mcp23017 (dfr0626) ?
D'avance merci pour votre réponse.
Bruno Martineau.
JaneYu 
