
tfcb
-
Content Count
10 -
Joined
-
Last visited
Posts posted by tfcb
-
-
On 4/2/2019 at 10:52 AM, JColvin said:Hi @tfcb,
I am taking a look into this; I connected a level shifter of my own (Digilent's Pmod LVLSHFT rather than the Sparkfun one you linked to) to connect an Arduino Uno and Pmod ISNS20, but I too am getting strange values (no initial offset for example), so I'm debugging some more.
Thanks,
JColvin@JColvin,
Any update on this? Still hoping to use the modules.
Thanks,
Tim
-
Hi,
Just tested the latest update. Here is the output with nothing connected to the IP connector. Since I'm using a Arduino Uno a https://www.sparkfun.com/products/12009 is inline to deal with 5V vs 3.3V. Any thoughts I what I might be doing wrong?
Thanks!
Tim
15:06:29.519 -> 13553 mA | 15.83 A 15:06:29.519 -> 15:06:29.553 -> 15:06:29.623 -> 16967 mA | 18.10 A 15:06:29.623 -> 15:06:29.623 -> 15:06:29.726 -> 13550 mA | 12.41 A 15:06:29.726 -> 15:06:29.726 -> 15:06:29.829 -> 12411 mA | 11.27 A 15:06:29.829 -> 15:06:29.829 -> 15:06:29.931 -> 11274 mA | 11.27 A 15:06:29.931 -> 15:06:29.931 -> 15:06:30.033 -> 11274 mA | 11.27 A 15:06:30.033 -> 15:06:30.033 -> 15:06:30.136 -> 11275 mA | 12.41 A 15:06:30.136 -> 15:06:30.136 -> 15:06:30.238 -> 15823 mA | 18.10 A 15:06:30.238 -> 15:06:30.238 -> 15:06:30.341 -> 19237 mA | 14.69 A 15:06:30.341 -> 15:06:30.341 -> 15:06:30.441 -> 13552 mA | 12.41 A 15:06:30.441 -> 15:06:30.475 -> 15:06:30.543 -> 11274 mA | 11.27 A 15:06:30.543 -> 15:06:30.577 -> 15:06:30.645 -> 11274 mA | 11.27 A 15:06:30.645 -> 15:06:30.679 -> 15:06:30.748 -> 11274 mA | 11.27 A 15:06:30.748 -> 15:06:30.782 -> 15:06:30.850 -> 11274 mA | 12.41 A 15:06:30.850 -> 15:06:30.884 -> 15:06:30.953 -> 15820 mA | 15.82 A 15:06:30.953 -> 15:06:30.986 -> 15:06:31.055 -> 15824 mA | 13.55 A 15:06:31.055 -> 15:06:31.089 -> 15:06:31.157 -> 12415 mA | 11.27 A 15:06:31.157 -> 15:06:31.191 -> 15:06:31.259 -> 11274 mA | 11.27 A 15:06:31.259 -> 15:06:31.293 -> 15:06:31.361 -> 11274 mA | 11.27 A 15:06:31.361 -> 15:06:31.395 -> 15:06:31.464 -> 11274 mA | 11.28 A 15:06:31.464 -> 15:06:31.499 -> 15:06:31.567 -> 13547 mA | 12.41 A 15:06:31.567 -> 15:06:31.601 -> 15:06:31.669 -> 19238 mA | 16.97 A 15:06:31.669 -> 15:06:31.703 -> 15:06:31.771 -> 16969 mA | 13.55 A 15:06:31.771 -> 15:06:31.805 -> 15:06:31.873 -> 11274 mA | 11.27 A 15:06:31.873 -> 15:06:31.907 -> 15:06:31.975 -> 11274 mA | 11.27 A 15:06:31.975 -> 15:06:32.009 -> 15:06:32.079 -> 11274 mA | 11.27 A 15:06:32.079 -> 15:06:32.114 -> 15:06:32.182 -> 11274 mA | 11.28 A 15:06:32.182 -> 15:06:32.215 -> 15:06:32.283 -> 11274 mA | 12.42 A
-
Any update?
-
THANKS! I appreciate the follow-up.
-
I ran the supplied code on an Arduino Uno using a level shifter. The output doesn't make any sense to me. Why are the mA and A results so different? Based on the use of a DMM the A should be approx 13.
Given the for loop wouldn't work on Arduino 1.8.8 I'm wondering if anyone has ever used this part successfully. I appreciate your insight on getting this to work.
Quote
21:03:59.722 -> -3 mA | 14.91 A
21:03:59.790 -> -17 mA | 15.74 A
21:03:59.824 -> 27 mA | 16.07 A
21:03:59.894 -> 16 mA | 15.56 A
21:03:59.928 -> 21 mA | 13.81 A
21:03:59.996 -> -37 mA | 10.92 A
21:04:00.029 -> -34 mA | 7.39 A
21:04:00.099 -> 3 mA | -21.73 A
21:04:00.133 -> 14 mA | -24.97 A
21:04:00.200 -> -7 mA | -15.56 A
21:04:00.234 -> -5 mA | -18.75 A
21:04:00.302 -> -22 mA | -24.99 A
21:04:00.336 -> 3 mA | -25.01 A
21:04:00.404 -> 18 mA | -20.24 A
21:04:00.439 -> 31 mA | -21.51 A
21:04:00.508 -> -10 mA | -22.08 A
21:04:00.541 -> 8 mA | -22.66 A
21:04:00.609 -> 1 mA | -22.27 A
21:04:00.643 -> -35 mA | -21.73 A
21:04:00.713 -> -10 mA | -12.20 A
21:04:00.747 -> -33 mA | -8.29 A
21:04:00.781 -> 37 mA | -4.85 A
21:04:00.850 -> -27 mA | -1.34 A
21:04:00.884 -> 28 mA | 2.17 A
21:04:00.952 -> -4 mA | 5.09 A
21:04:00.987 -> 10 mA | 7.94 A
21:04:01.056 -> 6 mA | 10.27 A
21:04:01.090 -> -11 mA | 12.49 A
21:04:01.159 -> -32 mA | 14.11 A
21:04:01.193 -> 37 mA | 15.23 A
21:04:01.261 -> -25 mA | 15.91 A
21:04:01.296 -> -15 mA | 16.01 A
21:04:01.364 -> 7 mA | 15.20 A
21:04:01.398 -> -28 mA | 13.04 A -
Are the data lines on the ISNS20 5v tolerant? The "resource center" isn't exactly clear. From what I can tell the various data lines on the Arduino Uno are all 5v. Obviously 3.3v will be provided to VCC. Thanks.
BTW, as I understand, this for statement:
for(int i; i < NUM_READINGS; i++)
should really be:
for(int i=0; i < NUM_READINGS; i++)
otherwise, the for loop might only run once (if lucky) as the variable "i" is undefined on the first run and might remain >= NUM_READINGS thereafter. The same version of gcc produces different results when executed on ARM or x86_64. More details than I understand at: https://stackoverflow.com/questions/4532871/define-integer-int-whats-the-default-value
-
FWIW, the following python program, based on this code: https://github.com/DesignSparkrs/DesignSpark.Pmod/blob/master/DesignSpark/Pmod/ISNS20.py
#!/usr/bin/python import spidev import time spi = spidev.SpiDev() spi.open(0, 0) spi.max_speed_hz = 100000 spi.mode = 0b00 try: while True: resp = spi.xfer2([0x00, 0x00]) w = resp[0] w <<= 8 w |= resp[1] refV = 3.3 lsb = refV/4096 mV= (w-2048)*lsb*1000 amps = mV/66 print amps time.sleep(1) except KeyboardInterrupt:# Ctrl+C pressed, so... spi.close()
produces:
-0.048828125 15.2221679687 16.1010742188 13.76953125 5.50537109375 -3.6376953125 -11.2182617188 -15.4296875 -15.576171875 -8.69140625 1.025390625 9.89990234375 14.8559570312 15.7836914062 9.0087890625 -1.318359375 -10.595703125 -0.048828125 -0.048828125
-
Hi,
I'm attempting to use the ISNS20 with an Arduino Uno. I am using a Sparkfun Bi-Directional Logic Level Converter to handle 5V vs 3.3V.
I'm using the source from https://www.hackster.io/58702/using-the-pmod-isns20-with-arduino-uno-0ee8db .
CS is connected to Pin 10, D0 is connected to Pin 12 and CLK is Pin 13.
I wire Black/Line to IP+ and the IP- to the Black/Line connection on an outlet. Unfortunately I get the same result if I draw current or not (using a hair dryer).
14:54:37.548 -> Courant=-33 mA
14:54:37.582 -> Courant=28 mA
14:54:37.582 -> Courant=-33 mA
14:54:37.615 -> Courant=-33 mA
14:54:37.615 -> Courant=28 mA
14:54:37.648 -> Courant=-33 mAI don't have an oscilloscope. I do have a DMM.
Thanks,
Tim
Pmod ISNS20 SPI Arduino
in Add-on Boards
Posted
@JColvin Update? I like to think we are being quite patient but this has dragged on for over 6 months.