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16  Using Arduino / General Electronics / Re: inverted Comparator on: February 19, 2013, 10:53:53 am
just fixed it. i soldered LEDs backwards and reconected their ground to 5V. it works fine now but my pcb is full of wires smiley-confuse. i'll be more carefull when i'll design another boards.
17  Using Arduino / General Electronics / Re: inverted Comparator on: February 18, 2013, 04:51:42 pm
So i was in shop today and wanted LP339D (i didn't know it woný work). Old man behind me said letters doesn't matter only numbers does. i argue that it isn't true. at the end he said that i might be right. LP339D were out of stock. Then i came and realised that he was right smiley-roll-sweat. Hopefully i'll never meet him again.
18  Using Arduino / General Electronics / Re: inverted Comparator on: February 18, 2013, 07:18:56 am
i believe you but it's not written there or at least i coludn't find it. Are you sure? Didn't you mean LM393?
19  Using Arduino / General Electronics / Re: inverted Comparator on: February 18, 2013, 06:10:42 am
How about LP339D?
20  Using Arduino / General Electronics / Re: inverted Comparator on: February 18, 2013, 04:59:28 am
Thanks. i dont really know what all those things mean in datasheet. i'll try to find some replacment.
21  Using Arduino / General Electronics / Re: inverted Comparator on: February 17, 2013, 04:45:10 pm
I have been trying lm358 on breadboard and i put lm339 on pcb. Big mistake. i'll try to reverse diodes and reconnect them or replace them with resistors if necessary.
thank for quick reply.
22  Using Arduino / General Electronics / inverted Comparator on: February 17, 2013, 04:14:19 pm
Hey guys,
Today i realised why my robot doesn't work. I'm using comparators for sensors and their output goes to LEDs and MCU. the problem is that Lm339D comparators have some weird output. i hooked it up to my breadboard and realised that LED, which was connected to output, was only working when cathode was connected to output and anode to 5V . I expected it another way, like output will be 5V+ or 0. I have already done PCB and i cant change it  so i want to know if there is some another comparator that i would use. At least what is that attibute called in datasheet.

Thanks for your help  smiley.
23  Development / Other Hardware Development / Re: my own ft232rl circuit on: January 27, 2013, 05:26:54 am
Do you have a diode acros that resistor like current Uno's use (anode to reset, cathode to +5)?
anode to reset on atmega or on ft232?
24  Development / Other Hardware Development / Re: my own ft232rl circuit on: October 06, 2012, 10:41:01 am
thanks i will try and post results later.
25  Development / Other Hardware Development / Re: my own ft232rl circuit on: October 05, 2012, 01:57:46 pm
(all my designs with that chip have been self powered).

my design is working but it doesnt upload everytime. first upload error second too and third success. would you be so nice and send me your schematic, please?
26  Using Arduino / Microcontrollers / Re: atmega1284p/pu on: September 29, 2012, 01:44:01 pm
after all it's working  smiley-lol. the problem wor with max232. i have made ft232rl circuit and now it works. im using optiboot but it's using rx0 and tx0, weird. anyway i wanna thank for your help. it shouldn't be done without you, thanks.
27  Development / Other Hardware Development / Re: my own ft232rl circuit on: September 27, 2012, 09:43:40 am
thanks for replies. its working  smiley-cool. just rx and tx was connected wrong. thanks for help anyway.
28  Development / Other Hardware Development / my own ft232rl circuit on: September 24, 2012, 03:11:31 pm
Hi guys,
i have made usb to uart coverter with ft232rl but a had few problems abouth it. first capacitor C3 stared smoking a burning after connecting to pc  smiley-eek. then i realised that pin 4,5 on IC are connected together. could this be reason why the cap died? anyway after desoldering this cap and disconnected those pins, i conncted this circuit to PC and drivers installed, It made new port (COM7) and it seemed like it's  working. when i connected it to the arduino on my breadboard i couldn't upload sketch. after compiling it reseted arduino but it showed error and didn't upload. Is there anything wrong with schematic or something else? Can someone help?
29  Using Arduino / Microcontrollers / Re: atmega1284p/pu on: September 15, 2012, 01:46:01 pm
rs232 plug is connected right i just have 30 pictures step by step of it and i choose one randomly. anyway i have bootloaded mighty 1284p 16mhz using optiboot so my line looks like this:
Code:
mighty_opt.bootloader.high_fuses=0xde

loopback is not working  smiley-mad but i can upload code to arduino uno. thats weird.
30  Using Arduino / Microcontrollers / Re: atmega1284p/pu on: September 15, 2012, 05:46:58 am
i tried both uarts but none of them works. 10k resistor is inside the rs232 cover and caps are not necessary because there is one, 1000uf. i guess it is enough. on the breadboard is also connected atmega328 and that one is working 100%, i used that as isp. i still get the same error while uploading as i wrote on one of my previous post. has anyone any idea?
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