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by jay123035
Wed May 14, 2014 5:35 pm
Forum: Automation, sensing and robotics
Topic: lm2576-5 circuit failing with 13v output
Replies: 4
Views: 3724

Re: lm2576-5 circuit failing with 13v output

thanks for your help. I swapped out the LM2576-5 and the circuit came back to life.


what would cause a LM2576-5 to go bad like that?
by jay123035
Sat May 03, 2014 1:55 am
Forum: Automation, sensing and robotics
Topic: lm2576-5 circuit failing with 13v output
Replies: 4
Views: 3724

lm2576-5 circuit failing with 13v output

I have a project that uses the basic "sample" power circuit for the LM2576-5 (found in issue 6 of MagPi) http://www.eleccircuit.com/wp-content/uploads/2007/07/lm2576-5_0.jpg but all of a sudden the output jumped to 13v instead of 5v. (fried the Raspberry pi it was powering) I am wondering what let t...
by jay123035
Thu Apr 10, 2014 6:25 pm
Forum: HATs and other add-ons
Topic: need specs for making ribbon cable
Replies: 4
Views: 995

Re: need specs for making ribbon cable

this is what i went with. thanks for all of the help.

http://www.digikey.com/product-detail/e ... -ND/686305
by jay123035
Thu Apr 10, 2014 4:36 pm
Forum: HATs and other add-ons
Topic: need specs for making ribbon cable
Replies: 4
Views: 995

Re: need specs for making ribbon cable

i was hoping for a few meters. but if i have to buy a role i will.

this was the connector i was planning on using.

http://www.digikey.com/product-detail/e ... ND/3821470
by jay123035
Thu Apr 10, 2014 3:30 pm
Forum: HATs and other add-ons
Topic: need specs for making ribbon cable
Replies: 4
Views: 995

need specs for making ribbon cable

i wanted to make a custom ribbon cable for the raspberry pi. but i found that there is a LOT of ribbon cable on the market and i cannot find the exact specs. this is what i found:TE CONNECTIVITY / MADISON CABLE 2-57051-4 FLAT CABLE, 26COND, 100FT, 28AWG, 150V http://www.newark.com/te-connectivity-ma...
by jay123035
Mon Mar 10, 2014 8:01 pm
Forum: Troubleshooting
Topic: SOLVED:bad video resolution on boot but changes after reboot
Replies: 3
Views: 1632

Re: bad video resolution on boot but changes after reboot

You can download the monitor settings using sudo tvservice -d /boot/edid.dat Then edit the /boot/config.txt and add (or uncomment if it exists) the line hdmi_edid_file=1 When you next boot your Pi will use the settings from the data file instead of looking for the monitor. Very handy if the monitor...
by jay123035
Mon Mar 10, 2014 6:37 pm
Forum: Troubleshooting
Topic: SOLVED:bad video resolution on boot but changes after reboot
Replies: 3
Views: 1632

SOLVED:bad video resolution on boot but changes after reboot

because i power the monior and the PI from the same source i have to have hdmi_force_hotplug=1 otherwise the PI does not see the monitor in time to output a video signal. but when that set and first power up the system i get state 0x120016 [DVI DMT (35) RGB full 5:4], 1280x1024 @ 60Hz, progressive a...
by jay123035
Thu Feb 13, 2014 5:28 pm
Forum: Automation, sensing and robotics
Topic: 24v to 12v input 12v and 5v outputpower supply circuit
Replies: 10
Views: 3428

Re: 24v to 12v input 12v and 5v outputpower supply circuit

You can get buck/boost BECs. e.g. http://www.helipal.com/bec-for-fpv-system-12-30v-in-12v-out.html i would like to build this myself not just strap on parts. my project has many components, GPS, analog Logic, I2C sensors, and WiFi. i am trying to build/fit this all onto one board that i can mount i...
by jay123035
Wed Feb 12, 2014 11:14 pm
Forum: Automation, sensing and robotics
Topic: 24v to 12v input 12v and 5v outputpower supply circuit
Replies: 10
Views: 3428

Re: 24v to 12v input 12v and 5v outputpower supply circuit

joan wrote:Have you considered using a pair of BECs, one to convert to 12V and one to 5V? They only cost a few UK£ and may be more efficient.

eBay search for 5V and 12V BEC.

No because i do not know what a BEC is or how i would use it. goolgle makes it seam like something RC hobbyists use a lot.
by jay123035
Wed Feb 12, 2014 9:12 pm
Forum: Automation, sensing and robotics
Topic: 24v to 12v input 12v and 5v outputpower supply circuit
Replies: 10
Views: 3428

24v to 12v input 12v and 5v outputpower supply circuit

I am working on a project to add a raspberry pi console to some ATV s. a couple of them run 24v systems but most run 12v. my touch monitor (Lilliput FA1012-np/c/t) needs 12v and the Pi needs 5v. in short I need a power circuit that can take 12v-24v input and output 12v and 5v. my idea is to use a LM...
by jay123035
Wed Nov 13, 2013 12:23 am
Forum: Other projects
Topic: Lilliput touch screen help needed
Replies: 7
Views: 8518

Re: Lilliput touch screen help needed

my lilliput touchscreen doesn't work, even after update, upgrade. the raspberry doesn't recognize it in usb list. I think my screen is broken, but why they do not test them before sending? had that happen a few times after installing software. just reboot a second time. and you should get proper to...
by jay123035
Wed Nov 06, 2013 8:26 pm
Forum: Other projects
Topic: Lilliput touch screen help needed
Replies: 7
Views: 8518

Re: Lilliput touch screen help needed

i bought the SD card (payed 40 (down from 80) to ship it to the states) first off if you boot the card with a USB device (yes even the USB for the monitor) the OS gets corrupted. (thankfully the first thing i did was make a back up of the image) also the config.txt file is stock, so the GPU ram defa...
by jay123035
Fri Oct 25, 2013 9:57 pm
Forum: Raspbian
Topic: Chromium and GPSd
Replies: 0
Views: 1702

Chromium and GPSd

I am making a web page that i want to be able to access GPS data from a "Kiosk Pi". I have chromium and gpsd installed and working separately but chromium is unable to deteriman location. "your location could not be determined" I started chromium with logging and got: [1:1:5152954258:ERROR:nss_util....
by jay123035
Tue Aug 06, 2013 2:43 am
Forum: Automation, sensing and robotics
Topic: power supply circuit
Replies: 12
Views: 2133

Re: power supply circuit

i am getting 88.7mV between ground and feedback/output. idk ill test the diode and the IC and go from there.

it cant be this hard. it was in MagPi
by jay123035
Thu Aug 01, 2013 10:13 pm
Forum: Automation, sensing and robotics
Topic: power supply circuit
Replies: 12
Views: 2133

Re: power supply circuit

is there anyway to test the diode and the I.C.?
by jay123035
Thu Aug 01, 2013 5:03 pm
Forum: Automation, sensing and robotics
Topic: power supply circuit
Replies: 12
Views: 2133

Re: power supply circuit

made a 4th attempt last night. still not as clean as i would like. after soldering i rapped the wires around the leads to help hold the component in place and to show what wire goes were. (though i am worried about vibrations so i might cover the bottom in epoxy when i am finished so that it moves a...
by jay123035
Wed Jul 31, 2013 5:39 pm
Forum: Automation, sensing and robotics
Topic: power supply circuit
Replies: 12
Views: 2133

Re: power supply circuit

Thank you all for your responses. I have a multimeter. I tested for 5v between the 100uF, 100uH, feedback junction and ground. (no voltage) I then tested between the pin 2 and pin 3 of the LM2576t -5 with no voltage (12v between pin 1 and pin 3) The 100uH has a white dot over one prong, does that me...
by jay123035
Tue Jul 30, 2013 7:30 pm
Forum: Automation, sensing and robotics
Topic: power supply circuit
Replies: 12
Views: 2133

power supply circuit

I am trying to assemble the power supply circuit out of the October 2012 issue of MagPi, but am having the worst luck. This is the first time i have used a lot of these complaints so i am a little concerned. (and my first 3 attempts have not worked) i think i am getting the grounds wrong. the first ...
by jay123035
Tue Jun 18, 2013 4:51 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to trigger gpio pin with 24v
Replies: 31
Views: 44633

Re: how to trigger gpio pin with 24v

the attached schematic shows how you can get the optocoupler input current to stay constant as the input voltage is changing. It should work in the range of 8V-40V or more. the zener diode sets 6.2V on the base of the npn, so the voltage across the 1.5k resistor is constant at 5.5V even as input vo...
by jay123035
Thu May 30, 2013 2:42 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to trigger gpio pin with 24v
Replies: 31
Views: 44633

Re: how to trigger gpio pin with 24v

the attached schematic shows how you can get the optocoupler input current to stay constant as the input voltage is changing. It should work in the range of 8V-40V or more. the zener diode sets 6.2V on the base of the npn, so the voltage across the 1.5k resistor is constant at 5.5V even as input vo...
by jay123035
Wed May 29, 2013 6:59 pm
Forum: Python
Topic: GPSd TCP socket test loop error
Replies: 3
Views: 1450

Re: GPSd TCP socket test loop error

import socket import os import time #Simply change the host and port values host = 'localhost' port = 2947 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) while 1: try: s.connect((host, port)) s.shutdown(2) print "Success connecting to " print host + " on port: " + str(port) #os.system("cgps ...
by jay123035
Wed May 29, 2013 2:24 pm
Forum: Python
Topic: GPSd TCP socket test loop error
Replies: 3
Views: 1450

Re: GPSd TCP socket test loop error

no your not missing anything. i am just that novice.

can you point me to what i should replace so that the lower section of code is run if the socket is NOT open? Maybe try?


thanks
by jay123035
Wed May 29, 2013 5:43 am
Forum: Python
Topic: GPSd TCP socket test loop error
Replies: 3
Views: 1450

GPSd TCP socket test loop error

first off thanks i am new to programming and am trying to learn from the deep end. my goal (at present): to have a loop that checks if GPSd is running on socket 2947 is so it prints 2 lines then sleeps for 30sec (30min) and checks again. if the Socket is "closed" it runs: sudo killall gpsd (to be su...
by jay123035
Wed May 29, 2013 4:28 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to trigger gpio pin with 24v
Replies: 31
Views: 44633

Re: how to trigger gpio pin with 24v

May I suggest this solution: use optocoupler 4N28 or similar. it will cost you about $0.25 if you only buy a few. connect 10k resistor from GPIO to GND connect collector/emitter of optocoupler to 3.3V/GPIO connect 6.8k resistor in series with diode of optocoupler this should give you 3.3mA in the d...
by jay123035
Tue May 28, 2013 4:50 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: how to trigger gpio pin with 24v
Replies: 31
Views: 44633

Re: how to trigger gpio pin with 24v

24v-to-3v3 (1).png
24v-to-3v3 (1).png (13.14 KiB) Viewed 42497 times
this is what i am thinking; it is a DC/DC converter to octo isolator (mostly for extra safety as DC/DC Con could drive 3v3) then to a NAND gate.

any ideas on the resister placement? (IDK were to even start on this, needs to work with 12v & 24v)

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