I received today this UBEC https://www.banggood.com/Hobbywing-3A-UBEC-5V-6V-Switch-Mode-BEC-For-RC-Models-p-915037.html?utm_design=41&utm_source=emarsys&utm_medium=Shipoutinform171129&utm_campaign=trigger-emarsys&utm_content=Winna&sc_src=email_2671705&sc_eh=130273cb35096df51&sc_llid=7033010&sc_lid=...
Watching the PefMon, does the program start up and ramp up to a high CPU percent rate of use or does it take 30+ minutes or several hours to ramp up the cpu percent of use. Say, when cpu use gets to around 50%, stop the program, does the % of cpu use drop quickly or does it continue at 20% or more? ...
Thanks for your reply :) My fan is pulling air from the case instead of pushing, I've read that is more effective. Is this still the case, when running with no heatsink? Positive or Negative air pressure, that is the question. My view, I use positive air pressure over negative air pressure because,...
Consider using the GPIO.add_event_detect(channel, GPIO.RISING, callback=my_callback, bouncetime=200) bouncetime to delay the responsiveness of the switch press. I, out of curiosity, tested out the idea with using a 32kHz interrupt routine. I took the frequency of 16kHz got the time period, used that...
I’ve pretty much given up on additional passive filtering because I figure the noise is internal to the processor (although the wiring could be neater – but its one Hertz), unless anyone has ideas… Send the noise through a inverter and feed it back into the sample. Might want to send the sample thr...
Perhaps 2 detectors would work a lot better, when you figure out what your issue. I use, as a 2nd sensor, a Microwave motion detector in conjunction with my primary sensor to give 2 degrees of detection. Microwave motion detectors, such as a Icstation RCWL-0516 Microwave Radar Detector are low cost,...
The DS3231 is, supposed to be accurate to +- 2min per year. I'd say if this is not accurate enough for a week or two, not connected to the internet, use a GPS module instead. Something like the Adafruit Ultimate GPS, which has a RTC, just add battery, has a low operating current requirement. I run a...
I use this code to comm with-an OLED #!/usr/bin/env python # Substantially derived from code by (c) 2015 Richard Hull The MIT License (MIT) # https://github.com/rm-hull/ssd1306: # "Permission is hereby granted, free of charge, to any person obtaining a copy # "of this software and associated documen...
(very nonlinear - my next post will go through the equations for this part, probably tomorrow am). Thanks The last time I put together a A:D converter, it looked a whole lot like this but without the LED's. https://www.seas.upenn.edu/~ese206/labs/adc206/Image5.gif You can be sure, I'll be following...
Something to consider. On the measurement node. Between measurements, bring the RPi input to a high impermanence state or remove the connection by opening the connection (a bilaterial switch) to the cap with a electronic switch, also, open the input to the cap, and short the sampling cap to ground t...
Based on the postings in this thread https://www.raspberrypi.org/forums/viewtopic.php?t=26907 a 32khz input does not sound overly ambitious. You have a lot going on in your code. Have you tried a simple experiment with code that only handles the input of the 32 khz signal and nothing else? Somethin...
Nutzzzzz! This code takes up > 30% of the cpu time handling a 32kHz interrupt. import RPi.GPIO as GPIO import time iPinInt = 21 GPIO.setmode(GPIO.BCM) def f32K( iChannel ): print("eek") return; GPIO.setup( iPinInt, GPIO.IN) GPIO.add_event_detect( iPinInt, GPIO.RISING, callback=f32K) time.sleep(100) ...
Just playing around, I enabled the 32jHz oj my DS3231 RTC and added on some code to handle the 32K signal as an interrupt. In short order cpu use jumps to > 50% and the red sign of doom shows up. I would think the RPI-B would handle a 32kHz-interrupt? import serial import RPi.GPIO as GPIO ##import s...
I use a DS3231 RTC. I have programmed the RTC to provide a 1PPS interrupt to a Python application. I recommend that, before the RTC is set to be used by the OS set up the alarms or interrupts before the OS locks you out. Once the RTC has its settings set then add it to the OS. This link should answe...
I want a device that measures the speed of a repetition of a barbell in a gym environment. I am only concerned with speed on the one plane - no interest in trying to track horizontal movements. Is this something that could be done with a Pi? In terms of hardware I envisioned a cable reel that could...
In theory: In the main code I import time. In a class that is in another module, that I import, time is imported. It makes sense, to me, that if I import time, before I import the class, then I do not need for the class to import time., correct? Also, if time is imported once and the class is callin...
I figure that if one was to use your way of blinking an LED one would want to set the GPIO pin high and then low? GPIO.output(4,GPIO.HIGH) In both the On and Off code setting the GPIO 4 to the same state will leave the LED on or off, depending how it is wired. In one of the scripts you need to chang...
I have a Arduino connected to myPi through the serial port. I use the Arduino to take sensor and LIDAR readings as well as torque the 3 servos. myPi makes the decisions. Good luck.