Go to advanced search

by henryhanselscott
Fri Aug 28, 2015 8:24 am
Forum: General discussion
Topic: HW Clock update frequency
Replies: 2
Views: 633

HW Clock update frequency

My Rpi2 project will be located off network therefore I have installed a hardware clock. Time is an essential element to my project because it logs data with a time stamp and it has to be very accurate. I am using a DS3231 chip for this. When the pi boots I know that it reads the hwclock, the questi...
by henryhanselscott
Tue Aug 04, 2015 2:24 pm
Forum: General discussion
Topic: Prevent SD card from being corrupted (improper shutdown)
Replies: 10
Views: 4242

Re: Prevent SD card from being corrupted (improper shutdown)

The thing is that the super cap is extremely expensive. It has a similar price as the the PI board itself. Or at least those I know of. If you can recommend some super cap that would do the job I would be grateful. They are very expensive I agree. I am using 2 of these at $13 each http://www.mouser...
by henryhanselscott
Mon Aug 03, 2015 5:01 pm
Forum: General discussion
Topic: Prevent SD card from being corrupted (improper shutdown)
Replies: 10
Views: 4242

Re: Prevent SD card from being corrupted (improper shutdown)

Hi Arosi, Nothing is going to be 100% bullet proof. I am also using the pi for a prototype product run. Not sure if you are good with electronics or not but the best solution that I could come up with was to build a circuit board that has a small super capacitor powered UPS on it that supplies power...
by henryhanselscott
Fri Jul 31, 2015 11:00 am
Forum: General discussion
Topic: Powering Multiple Pi's
Replies: 15
Views: 2876

Re: Powering Multiple Pi's

I have used these with very good results: http://www.ebay.com/itm/New-Mini-5pcs-LM2596s-3A-DC-to-DC-Buck-Converter-Power-Supply-Step-Down-Module-/291355638787?hash=item43d6263c03 One word of caution, out of a batch of 5 I had one that the capacitor exploded on me. The metal top came off with such fo...
by henryhanselscott
Thu Jul 30, 2015 5:40 pm
Forum: General discussion
Topic: usb oscilloscope
Replies: 8
Views: 3886

Re: usb oscilloscope

Knowing that the OP was asking about USB scopes...but....I considered going that route for a while and after much reading the jury was still out if they would meet my requirements or not. So, I decided to go with the popular Rigol DS1102E bench scope. I now have 2 of them, one for work and one for h...
by henryhanselscott
Tue Jul 28, 2015 4:08 pm
Forum: General discussion
Topic: RPI freeze after a few hours running?
Replies: 5
Views: 807

Re: RPI freeze after a few hours running?

Do you have any custom scripts running? Once I had almost the same issue with a pi project. It would run fine for hours and hours and then freeze and become unresponsive. Using the task manager I could see that over time my memory allocation in Python grew larger and larger to the point the pi stopp...
by henryhanselscott
Tue Jul 28, 2015 4:00 pm
Forum: General discussion
Topic: Raspberry pi 2 for long term usage
Replies: 17
Views: 3666

Re: Raspberry pi 2 for long term usage

Nothing official here but I have had one installed in a factory setting for several months now. It has no power conditioning, can lose power at any time without a shutdown procedure, experiences high heat (120 Fahrenheit) and vibration on the machine that it is on, and usually runs 24 hours per day ...
by henryhanselscott
Wed Jul 22, 2015 3:24 pm
Forum: General discussion
Topic: How to connect a stepper motor
Replies: 9
Views: 1097

Re: How to connect a stepper motor

I think for some strange reason they were put off by the string of question marks I too am a bit puzzled at the negative response of the quantity of question marks? Multiple question marks indicated to me that possibly the OP knows very little to nothing about stepper motors and interfacing the Rpi...
by henryhanselscott
Tue Jun 16, 2015 4:44 pm
Forum: General discussion
Topic: Raspberry Pi as Motorbike Dashboard
Replies: 4
Views: 4696

Re: Raspberry Pi as Motorbike Dashboard

Am I right in thinking that the Pi can read digital signals and control digital device (relays etc) out of the box without additional boards? The pi is a 3.3 volt device at the inputs and outputs and VERY low current on the outputs. So, really it is not directly able to connect to most sensors and ...
by henryhanselscott
Tue Jun 16, 2015 10:36 am
Forum: General discussion
Topic: Rpi2 renaming Flash?
Replies: 4
Views: 940

Re: Rpi2 renaming Flash?

Does the FRED directory already exist before plugging the drive in Not sure what you mean exactly...but the mythical "FRED" directory exist only on the USB flash. With the drive in one of the USB ports and then after an abrupt power loss on reboot, the drive now is "FRED_ " using file manager to lo...
by henryhanselscott
Mon Jun 15, 2015 7:08 pm
Forum: General discussion
Topic: Rpi2 renaming Flash?
Replies: 4
Views: 940

Rpi2 renaming Flash?

So sometimes when an unexpected power failure happens with my pi and it has a USB flash inserted into it, it renames my flash. For instance, the flash is named 'FRED' using the Windows utility when you right click a drive and assign it a name. When being used in the pi, if power fails then on reboot...
by henryhanselscott
Mon Jun 15, 2015 1:58 pm
Forum: General discussion
Topic: Raspberry Pi as Motorbike Dashboard
Replies: 4
Views: 4696

Re: Raspberry Pi as Motorbike Dashboard

Probably not directly possible. The pi is strictly a digital device, you can use some timing functions and RC circuits to get some basic not very accurate analog data using a digital port watching for the trip point for the on/off, off/on transition. So you would likely need something along the line...
by henryhanselscott
Fri Jun 12, 2015 9:45 am
Forum: General discussion
Topic: Where / how to buy BCM2835 for prototyping / production...
Replies: 33
Views: 13208

Re: Where / how to buy BCM2835 for prototyping / production.

Sorry if this seems like a hijack of the thread, but

Well we have definitely entered the rabbit hole, and I am afraid that I lead the way...........
by henryhanselscott
Thu Jun 11, 2015 1:11 pm
Forum: General discussion
Topic: Where / how to buy BCM2835 for prototyping / production...
Replies: 33
Views: 13208

Re: Where / how to buy BCM2835 for prototyping / production.

This is the EXACT reason the Compute Module was developed. The CM is what you want. Sorry if this seems like a hijack of the thread, but speaking of the CM, any time table for upgrades to the 4 core and more memory? I do have an embedded application that is in the prototype stage using the Rpi2. At...
by henryhanselscott
Sun Jun 07, 2015 12:34 pm
Forum: General discussion
Topic: Copy folder to USB drive
Replies: 1
Views: 1380

Copy folder to USB drive

One of my projects requires me to transfer text files contained in a folder to a USB flash drive. I am using Python 3. Currently, my Flash drive is named CTI and my Python code copies the folder via: shutil.copytree ("bla bla bla", "/media/CTI") What I would like for it to be able to do is transfer ...
by henryhanselscott
Fri Jun 05, 2015 3:17 pm
Forum: General discussion
Topic: Real time clock reset issue
Replies: 4
Views: 2927

Re: Real time clock reset issue

Thank you for the responses. I checked the battery, it measures 3.059 volts with a Fluke DVOM. I am running the latest raspbian image so I should be able to take advantage of "dtoverlay=i2c-rtc,ds1307" One question yet, using "dtoverlay=i2c-rtc,ds1307", how would I go about setting the time on the R...
by henryhanselscott
Thu Jun 04, 2015 9:34 am
Forum: General discussion
Topic: Real time clock reset issue
Replies: 4
Views: 2927

Real time clock reset issue

I have installed an RTC module like this one: http://thepihut.com/products/mini-rtc-module-for-raspberry-pi part of the configuration is like this sudo nano /etc/rc.local echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device sudo hwclock -s date exit 0 The problem is that this causes the time o...
by henryhanselscott
Wed Jun 03, 2015 12:10 pm
Forum: General discussion
Topic: Loading my app like Scratch loaded at boot time
Replies: 5
Views: 804

Re: Loading my app like Scratch loaded at boot time

I may can help you with some of your request. After trying all of the "normal methods" to auto start my Python script a couple of things became apparent to me. 1. If your script uses the "x" environment then some stated autostart routines will not work. 2. If your script uses the GPIO pins then some...
by henryhanselscott
Mon Jun 01, 2015 10:04 am
Forum: General discussion
Topic: Power Raspberry Pi through GPIO pins
Replies: 4
Views: 896

Re: Power Raspberry Pi through GPIO pins

This is the ONLY way that I will power a pi. I do use an external fuse to protect things if something goes wrong.

Henry
by henryhanselscott
Sun May 31, 2015 10:41 am
Forum: General discussion
Topic: Bottom line on RTC
Replies: 1
Views: 425

Bottom line on RTC

Suppose that I have a Rpi2 that is field deployed with no internet connection. I have a RTC installed (DS3231) and I want the pi to read the RTC on boot every time and write it to the system time. I cannot seem to find any definitive information on the net for this. Depending on what you read, you c...
by henryhanselscott
Wed May 27, 2015 10:38 am
Forum: General discussion
Topic: What is your main purpose of the PI?
Replies: 22
Views: 3858

Re: What is your main purpose of the PI?

Rapid prototyping of new product ideas.
by henryhanselscott
Fri May 22, 2015 1:25 pm
Forum: General discussion
Topic: What is the best way to send data from one Pi to another?
Replies: 27
Views: 10325

Re: What is the best way to send data from one Pi to another

If it were me......I am a novice mind you, I would send it via serial data either through the GPIO or a USB serial convertor.
This assumes that they are relatively close to each other < 100 ft.
Henry
by henryhanselscott
Thu May 21, 2015 5:44 pm
Forum: General discussion
Topic: is raspberry pi suitable for industrial application
Replies: 6
Views: 5255

Re: is raspberry pi suitable for industrial application

Sounds like in general you need to continue your studies on industrial control systems. I have worked with many industrial engineers over the past 20 years, they come in all varieties and they all prefer different methods to accomplish the same goals. Its kind of like cooking, a cook will develop a ...
by henryhanselscott
Wed May 20, 2015 3:52 pm
Forum: General discussion
Topic: Challenge - who can do this for me?
Replies: 19
Views: 2449

Re: Challenge - who can do this for me?

http://www.piups.net/ I use a home brew version of this UPS for my pi and it has proven bullet proof so far (2 months). Unless you have something that can tell the pi to start the proper shutdown procedure while it operates on the "backup" power you will run the risk of corruption of data on the SD ...
by henryhanselscott
Tue May 19, 2015 8:41 pm
Forum: General discussion
Topic: Touch screen Image
Replies: 1
Views: 352

Touch screen Image

http://www.amazon.com/SainSmart-Module-Screen-Display-Raspberry/dp/B00OPZNI3M Has anyone been able to figure out how to install just the drivers for this screen for the Rpi2? The supplied image does not seem stable and I would like to use the latest Rasbian image and install the spi drivers for the ...

Go to advanced search