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by MarkTF
Fri Dec 22, 2017 3:21 pm
Forum: General discussion
Topic: Warrenty of the Pi ?
Replies: 63
Views: 5570

Re: Warrenty of the Pi ?

1) I've used these pins without issue. In the niche of people doing external watch dog stuff, it's probably the norm to use these pins. 2) You probably want to check your soldering station to verify that it is ESD safe, your are using good soldering technique, and that whatever circuitry you are att...
by MarkTF
Thu Dec 21, 2017 4:41 pm
Forum: General discussion
Topic: Looking for a small monochrome display.
Replies: 9
Views: 1818

Re: Looking for a small monochrome display.

Maxwell175 wrote:
Thu Dec 21, 2017 2:36 pm
Is the one I mentioned above going to work? I would love some code samples or something.
From Adafruit, one of the official Raspberry Pi distributors: https://cdn-learn.adafruit.com/download ... rry-pi.pdf
by MarkTF
Tue Dec 12, 2017 4:14 pm
Forum: General discussion
Topic: Distance using u'sonic sensor
Replies: 13
Views: 1427

Re: Distance using u'sonic sensor

For what it's worth, there is now a HC-SR04P (note the "P") variant of the HC-SR04 sensor that works powered either from 3.3V or 5.0V. Using this sensor powered with 3.3V would eliminate the need for the voltage divider resistor network. That said, the standard HC-SR04 can be used with the voltage d...
by MarkTF
Fri Dec 08, 2017 2:27 pm
Forum: General discussion
Topic: Should I move to Ubuntu
Replies: 10
Views: 1755

Re: Should I move to Ubuntu

I've run Ubuntu (Lubuntu actually, which is the LXDE desktop variant) on an old Intel machine since version 12, now 17, and the version level upgrades do break installed applications from time to time. I'm not clear on why Ubuntu would be any different from Raspbian in this respect.
by MarkTF
Wed Dec 06, 2017 2:23 pm
Forum: General discussion
Topic: First "REAL" RPi Rack
Replies: 35
Views: 21242

Re: First "REAL" RPi Rack

. . . if you are going to all the trouble of making a custom rack for high density clusters, then why not build a rack based on the CM3. You could eliminate a lot of the interconnecting cables and fit a whole lot more in the same space. . . It's probably relevant that the original post is from July...
by MarkTF
Tue Dec 05, 2017 6:33 pm
Forum: General discussion
Topic: 3V3 rise time
Replies: 21
Views: 1547

Re: 3V3 rise time

Am I reading the oscilloscope plot wrong or does the 5 V (yellow trace) start at 2 V, hang out there for a while, and then ramp up to 5 volts? How does that happen? I think it's showing 2 V per vertical division for both traces, 0 V is at the second line from the bottom, and 500 us per horizontal di...
by MarkTF
Tue Dec 05, 2017 2:46 pm
Forum: Advanced users
Topic: I want an audio player like Volumio or Runeaudio or moode
Replies: 8
Views: 11589

Re: I want an audio player like Volumio or Runeaudio or moode

Is it possible to Install extra like smb server On a distro like the ones i mentioned? I know it is all based On the same but On all the fora of those distros they say you cant Install it On Raspbian thats why i was looking for alternatives I just installed Volumio on a NextThing CHIP ARM SBC, so t...
by MarkTF
Mon Nov 20, 2017 1:58 pm
Forum: General discussion
Topic: Moving from RPi to standalone devices and peripherals
Replies: 12
Views: 1240

Re: Moving from RPi to standalone devices and peripherals

When I lasted used microPython on the ESP8266, it was pretty buggy, but they've had a year and a half to sort things out and it may be better now. Motivated by this thread, I spent a few hours with MicroPython installed on a ESP8266 "NodeMCU V3" board over the weekend working through the tutorials ...
by MarkTF
Tue Nov 14, 2017 5:30 pm
Forum: General discussion
Topic: Moving from RPi to standalone devices and peripherals
Replies: 12
Views: 1240

Re: Moving from RPi to standalone devices and peripherals

Anyone have some input for good MCU's for ASM? You can find freely available assemblers and processor simulators for a variety of MCU architecture. SDCC is one I've used and it's in the RPi repositories. It supports a number of MCUs, but the 8051 is the original and best documented. Many of the MCU...
by MarkTF
Tue Nov 14, 2017 4:25 pm
Forum: General discussion
Topic: Moving from RPi to standalone devices and peripherals
Replies: 12
Views: 1240

Re: Moving from RPi to standalone devices and peripherals

I personally have not had any real issues with powering the little modules ESP-12F providing the 3.3V supply is close and there is one decent decoupling capacitor across the module. I have about 20 of these deployed around my house and they have been running for months with no issues. Indeed, if th...
by MarkTF
Tue Nov 14, 2017 2:07 pm
Forum: General discussion
Topic: Moving from RPi to standalone devices and peripherals
Replies: 12
Views: 1240

Re: Moving from RPi to standalone devices and peripherals

I'd take a look at the Arduino products. The general idea is a beginner (to microcontrollers) friendly development environment and a very rich user community. Arduino "sketches" are written in a variant of C/C++ which is the dominate programming language in the microcontroller world. While the ESP82...
by MarkTF
Tue Nov 14, 2017 1:46 pm
Forum: General discussion
Topic: Charging Raspberry Pi 4 wheeled Rover with Batteries
Replies: 1
Views: 585

Re: Powering a Raspberry Pi Rover with Lithium Ion Batteries

Do you have a link to where that figure originates? I'm very wary of that circuit and I'm surprised the (generally quite competent) people at AdaFruit would recommend it unless there's something going on that I'm missing. LiPo batteries can be connected in parallel and they will appear to the charge...
by MarkTF
Mon Nov 06, 2017 5:49 pm
Forum: General discussion
Topic: Extending Wireless Range
Replies: 72
Views: 9459

Re: Extending Wireless Range

Legalities aside, it requires a certain amount of skill to add a connector to the Pi3 and expect it to work well at gigahertz frequencies. Without such skill one is probably more likely to wind up with something that works worse than the on-board antenna. There is a great deal of "magic" involved in...
by MarkTF
Thu Oct 26, 2017 2:52 pm
Forum: General discussion
Topic: count the number of people leaving and entering vehicle
Replies: 3
Views: 513

Re: count the number of people leaving and entering vehicle

arduino for taking some action like disengaging the clutch if number of passengers are in excess. ... and arduino is connected with the raspberry. is there any possibility that the raspberry do the function of the arduino. Raspberry Pi has GPIO (controllable digital input or output pins) that can c...
by MarkTF
Thu Oct 26, 2017 2:41 pm
Forum: General discussion
Topic: raspberry pi 3 reacts to every electric pulse
Replies: 6
Views: 950

Re: raspberry pi 3 reacts to every electric pulse

You don't describe the details of the setup, but I'm guessing that you have a relatively long run of wire between the GPIO pins and the switch. I'm also assuming that your circuit is a switch closure to ground with a pullup to 3.3 V near the GPIO end. With this it sounds like you have an electromagn...
by MarkTF
Thu Oct 26, 2017 1:10 pm
Forum: General discussion
Topic: 8-BIT Game Design
Replies: 4
Views: 1756

Re: 8-BIT Game Design

I haven't used it, but Pico-8 is available for Raspberry Pi: https://www.raspberrypi.org/magpi/pico-8-review/
by MarkTF
Mon Oct 23, 2017 3:15 pm
Forum: General discussion
Topic: Serial Port Communication over the USB in Raspberry Pi 3
Replies: 18
Views: 47204

Re: Serial Port Communication over the USB in Raspberry Pi 3

when i plug my device the port /dev/ttyACM0 appear, but i still confused if i need any adapter like the one below. I don't think you need a stand alone USB to serial adapter. If a ttyACMx port appears, the device has registered as an "abstract control model" which (historically) is a serial modem d...
by MarkTF
Thu Oct 12, 2017 5:15 pm
Forum: General discussion
Topic: How to measure current draw of the RPi
Replies: 31
Views: 11650

Re: How to measure current draw of the RPi

Of all the ideas presented so far, I think the "USB Power Meter" idea is probably going to be the most workable. Having looked at them on Amazon, the thing that is curious is the difference in price between seemingly (more or less) identical devices. For example, the one at the link posted earlier ...
by MarkTF
Wed Oct 11, 2017 2:05 pm
Forum: General discussion
Topic: Arduino or raspberry
Replies: 6
Views: 977

Re: Arduino or raspberry

A simple Arduino (Uno) is likely the better choice for collecting data from the sensors since it has an integral analog to digital converter which you'll need and getting deterministic timing for the RPM measurement is more straightforward. A strain gauge will probably also need a suitable amplifier...
by MarkTF
Wed Oct 04, 2017 5:16 pm
Forum: General discussion
Topic: Why no enthusiast Raspberry Pi products?
Replies: 53
Views: 6706

Re: Why no enthusiast Raspberry Pi products?

. . . To me, it seems logical that if you did produce a more expensive product with higher profit margins, this would feed back to the company, allowing them to further pursue their original cause. . . . Balanced against this is that "a more expensive product" in this context puts that product in c...
by MarkTF
Mon Oct 02, 2017 12:47 pm
Forum: General discussion
Topic: If you built a fully loaded Raspbian
Replies: 18
Views: 2573

Re: If you built a fully loaded Raspbian

. . . it takes a week to do things in Linux that can be done in seconds on a Windows system. . . When I first installed CH340 drivers on Windows 7 a couple years back the only available install package was in Chinese and my Intel/Ubuntu (12.x?) machine just worked without modification. I'm pretty s...
by MarkTF
Wed Sep 27, 2017 5:54 pm
Forum: General discussion
Topic: My dream: Pi Foundation to recreate an old x86 pc!
Replies: 14
Views: 1771

Re: My dream: Pi Foundation to recreate an old x86 pc!

In the industrial SBC computer market there are plenty of small Intel/MS-DOS single board computers available. They are fairly costly due to the limited market. Also DOS drivers for modern peripherals generally don't exist.
by MarkTF
Wed Sep 27, 2017 4:02 pm
Forum: Off topic discussion
Topic: Raspberry Pi for the post apocalypse survivalist.
Replies: 13
Views: 3258

Re: Raspberry Pi for the post apocalypse survivalist.

If I didn't have any food I would have an extreme lack of interest in RPis or any other computers. Hey now, if you've got a bag of RPI Zeroes, you've got a bag of chips. Eat up, they even come in different flavors. Nextthing's C.H.I.P. might be more appropriate in this context. https://discourse-cd...
by MarkTF
Wed Aug 23, 2017 6:27 pm
Forum: General discussion
Topic: Serial ESP8266 Remote Serial Port WIFI wireless, WiFi Serial Transceiver Module , ESP32 Wifi Bluetooth Board
Replies: 4
Views: 2951

Re: Serial ESP8266 Remote Serial Port WIFI wireless, WiFi Serial Transceiver Module , ESP32 Wifi Bluetooth Board

These links might be helpful: http://www.esp8266.com/wiki/doku.php and http://www.esp8266.com/ A couple of thoughts 1) If you simply want to add wifi capability to an RPi-2B then a usb wifi adapter is a better approach. It will be easier to integrate and will provide a much faster and more versatile...
by MarkTF
Tue Aug 15, 2017 2:35 pm
Forum: General discussion
Topic: HC-05 max baudrate?
Replies: 3
Views: 2322

Re: HC-05 max baudrate?

What's on the other side of your bluetooth connection? I have a hard time believing 115200 baud is unacceptably slow for vim, particularly since vi has been in use since 300 baud modems were cutting edge technology. I think it's more likely that you're seeing some sort of packet latency issue over t...

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