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by saranga2000
Sun Mar 31, 2013 4:33 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Pi PIC Programmer using GPIO
Replies: 102
Views: 36643

Re: Raspberry Pi PIC Programmer using GPIO

Awesome Tomas - for adding EEPROM only erase and write. Makes me all the more frustrated that I havent made much progress in getting it to work - talked to two good electronics hackers here - and they suggested I go with arduino instead of PIC for my needs ( and talk to it over usb) . That would pro...
by saranga2000
Mon Mar 25, 2013 5:16 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Pi PIC Programmer using GPIO
Replies: 102
Views: 36643

Re: Raspberry Pi PIC Programmer using GPIO

Great to see multiple people having success with Holden's rpp - rpp itself and mods. Just reiterates how much of a noob I am, how far I am from the skills needed. For my part, I tried 1. rebuilding the circuit a few times - did not help 2. tried to measure the voltages at vss and vdd like tlc sugges...
by saranga2000
Thu Mar 14, 2013 1:47 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Pi PIC Programmer using GPIO
Replies: 102
Views: 36643

Re: Raspberry Pi PIC Programmer using GPIO

Thanks for your reply Tomas. I have just bought a pic programmer. I will try the things you suggested and post back.
by saranga2000
Tue Mar 12, 2013 12:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RasPI & PIC mcu bootloader
Replies: 5
Views: 1647

Re: RasPI & PIC mcu bootloader

Hi Valter, Can this be used for PIC16F628a too? If yes, what modifications are needed - have you done them by anychance? Also, how is this different from Holden's RPi Pic Programmer - rpp ( http://holdenc.altervista.org/rpp/) - apart from a far simpler circuit in this case? I have been trying to get...
by saranga2000
Mon Mar 11, 2013 7:24 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Pi PIC Programmer using GPIO
Replies: 102
Views: 36643

Re: Raspberry Pi PIC Programmer using GPIO

Hi Holden, I tried without the led's. Previously I also had not connected capacitors across the power supply, I did that this time around. Running sudo ./rpp still returns the same Error: unknown device or programmer not connected. I once again connected led's to each of the outs, to check that they...
by saranga2000
Fri Mar 08, 2013 6:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Raspberry Pi PIC Programmer using GPIO
Replies: 102
Views: 36643

Re: Raspberry Pi PIC Programmer using GPIO

Hi, I am trying to see if I can program a PIC16F628a based on your circuit and software. I think I have wired up everything correctly. I added 4 led's( each with a 1KOhm resistor) for debugging: 3 green led's in parallel with the Clock, Data, and VPP, and 1 yellow led in parallel with the T3/Gpio8 f...
by saranga2000
Wed Mar 06, 2013 5:23 pm
Forum: Beginners
Topic: Wireless EW-7811Un no longer connects
Replies: 3
Views: 641

Re: Wireless EW-7811Un no longer connects

I have the exact same problem - wifi used to connect, but now it doesnt, unless I startx. I installed wicd, and am using dlink dwa 131. Nothing has changed at all, no configs etc, so not sure why suddenly wifi doesnt connect in the non-graphical mode. I also get the skip wlan0, eth0 as it boots up. ...
by saranga2000
Sat Feb 23, 2013 1:52 pm
Forum: Automation, sensing and robotics
Topic: drive multiple heavy duty stepper motors
Replies: 16
Views: 19374

Re: drive multiple heavy duty stepper motors

Thanks photomankc, Ravenous for your replies. To be honest, I don't have any specific use case for the CNC I was thinking of making. My only motivations are: 1. Build a CNC using RPI: stumbled on a lot of DIY CNC videos, articles on servos/steppers etc and its fascinating. 2. It not be a toy: that I...
by saranga2000
Thu Feb 21, 2013 6:16 am
Forum: Automation, sensing and robotics
Topic: drive multiple heavy duty stepper motors
Replies: 16
Views: 19374

Re: drive multiple heavy duty stepper motors

Thanks Ravenous & photomankc for your replies. I guess its a good thing I reached out here and got your feedback, before I started purchasing parts. Btw, Ravenous, the Nema34 is listed for US$90 on an online site, and the other axes can be of lesser torque. So the sum total I thought shouldn't cost ...
by saranga2000
Wed Feb 20, 2013 2:32 pm
Forum: Automation, sensing and robotics
Topic: drive multiple heavy duty stepper motors
Replies: 16
Views: 19374

Re: drive multiple heavy duty stepper motors

Thanks mayannaise & photomankc for your reply. To your pointers to easydriver & L6740 breakout, I had looked at online information on it and its more powerful v2 ( big easy driver) - https://www.sparkfun.com/products/10735. The main issue I saw was 1. they can drive a max of 2A per phase - a decentl...
by saranga2000
Sun Feb 10, 2013 7:08 am
Forum: Automation, sensing and robotics
Topic: drive multiple heavy duty stepper motors
Replies: 16
Views: 19374

drive multiple heavy duty stepper motors

Hi, I want to make a CNC m/c driven by up to 4 to 6 heavy duty 24v steppers(xyz axes +tool changers). Is there a detailed tutorial (schematic, part numbers) to help make stepper motor drivers controlled by a raspberry pi? Preferably via I2C, to leave some gpio pins free for other purposes. External ...
by saranga2000
Wed Dec 19, 2012 3:00 pm
Forum: Beginners
Topic: D-Link DWA-131 // Help Please
Replies: 16
Views: 26314

Re: D-Link DWA-131 // Help Please

I just got myself a D-Link DWA 131 and tried some of the suggestions given in this thread unsuccessfully. The easiest way I was able to get it up and running, was by following the instructions in http://elinux.org/RPi_VerifiedPeripherals#Working_USB_Wi-Fi_Adapters for this adapter which is to use wi...

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