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Post by atomsoft on Dec 9, 2014 8:43:31 GMT -8
Have you tried with an inductor and capacitor to smooth it out?
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Post by jamesbowman on Dec 9, 2014 10:04:36 GMT -8
Yes, I tried a few things on a solderless breadboard, a lot of things seemed reasonable but did nothing to help the noise problem. Ears are pretty good at picking up noise!
In the end using a tiny voltage regulator to make a clean 3v3 seemed the safest way to go.
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Post by atomsoft on Dec 9, 2014 10:27:35 GMT -8
ok but i had hoped to omit any regulators. Ill do it the simple regulator and jack with fet
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hla
Junior Member
Posts: 29
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Post by hla on Dec 9, 2014 12:12:10 GMT -8
And while you´re at it, add a version with processor included as well. Not much extra cost, but makes the board "unique". There are several options out there with only FT800, such as MikroElektronika and 4DSystems. Alternatively make a layout that makes it easy to piggyback a arduino pro mini, micro og Teensy or something... :-)
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Post by atomsoft on Dec 10, 2014 5:14:34 GMT -8
Which processor? Arduino style or PIC.. if PIC... which type.. 8bit or 32bit
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Post by jamesbowman on Dec 10, 2014 7:08:11 GMT -8
I'd vote Arduino - seems that would make the most people happy.
On the other hand, adding an MCU (particularly with DIP footprint) makes the board more complicated. Right now nobody is making a "minimal" FT800 breakout board, which is what you have.
Personally, I want the minimal version - my one feature request is that you break out the FT800's VCCIO so I can drive a display from the 2.5v and 1.8v MCUs I'm using.
J.
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hla
Junior Member
Posts: 29
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Post by hla on Dec 10, 2014 10:48:37 GMT -8
True about the "minimal". The smallest I've seen is the www.mikroe.com/click/eve/ which is 3.3V. It has LM4864 audio and has pinout for mikroBus. However, I would still want an onboard CPU. But I'm old enough to know that I cannot get whatever I want. Not even now right before Christmas :-)
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Post by atomsoft on Dec 12, 2014 15:26:42 GMT -8
Ok for the basic how is this?
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Post by atomsoft on Dec 12, 2014 15:28:00 GMT -8
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Post by jamesbowman on Dec 12, 2014 17:25:48 GMT -8
Looks really neat - congratulations on getting it laid out on a 1 inch 2-layer PCB!
Oh, when I did the GD2 proto, I mixed up 40-pin connectors, and ordered "bottom" contacts instead of "top". From the look of your board I think you also want the "top" contact version, Digikey 609-1200-1-ND.
Btw I have a box of leftover stuff from the GD2 prototype phase - yours if you want it... jamesb@excamera.com
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Post by atomsoft on Dec 12, 2014 17:39:46 GMT -8
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hla
Junior Member
Posts: 29
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Post by hla on Dec 13, 2014 2:58:40 GMT -8
I love the size ! With this one I only need to solder the FT800/801 (probably the hard part), connector and a few components for backlight. Connect it to a 3.3V Arduino Pro Mini and be ready to go.
If I want a capacitive touch controller, I guess this should be a separate board anyway, because the location of the connectors may differ between different touch panels ?
When can I buy the PCB ? :-)
What are the SMD sizes ?
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Post by atomsoft on Dec 13, 2014 6:16:11 GMT -8
I need to make a BOM and stuff but i was planning on selling these made, if you want a PCB with no components then no problem.
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Post by atomsoft on Dec 13, 2014 6:30:08 GMT -8
I used this headphone jack on bottom: www.ebay.com/itm/111515620834?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AITBut didnt drill holes. lets me use that space. BOM: Partlist exported from C:/Users/Jason/Documents/eagle/FT800/minift800v1.sch at 12/13/2014 9:28:07 AM Part Value Device Package Description SEEED C2 100nf C-EUC0603 C0603 CAPACITOR, European symbol C3 100nf C-EUC0603 C0603 CAPACITOR, European symbol C4 100nf C-EUC0603 C0603 CAPACITOR, European symbol C5 3.3nf C-EUC0603 C0603 CAPACITOR, European symbol C6 10uF C-0805 C0805 C11 0.022uF C-USC0603 C0603 CAPACITOR, American symbol L1 4.7uH L-SPD3D16-4R7M L0420 0210410P1 Q1 MOSFET-N-044020001 MOSFET-N-044020001 SOT23 CJ2302:SMD MOSFET N-CH 20V-2.1A 0440200P1 R1 10k R-EU_R0603 R0603 RESISTOR, European symbol R2 10k R-EU_R0603 R0603 RESISTOR, European symbol R3 10k R-EU_R0603 R0603 RESISTOR, European symbol R4 10k R-EU_R0603 R0603 RESISTOR, European symbol R5 10k R-EU_R0603 R0603 RESISTOR, European symbol R6 10k R-EU_R0603 R0603 RESISTOR, European symbol R7 2R375 R-US_R0603 R0603 RESISTOR, American symbol R8 100R R-US_R0603 R0603 RESISTOR, American symbol U$1 FT800Q FT800Q VQFN_7X7_48PIN U$2 AUDIO_CHINA AUDIO_CHINA AUDIO_CHINA U$3 XC6206 XC6206 SOT-23 (3.3v 500mA) U$4 1X9 1X9 1X9 U$5 4.3_LCD_40PIN 4.3_LCD_40PIN SD-54104-083 (MOLEX: 0541044033) U5 MIC2289 MIC2289 NGL0008B (24v version) Ill post info on my blog and post a link here for you guys Here is the link
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hla
Junior Member
Posts: 29
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Post by hla on Dec 13, 2014 8:07:39 GMT -8
Great ! I guess we should continue discussing your board over at your blog. The original main topic in this thread was FT801 and capacitive touch. Guess it has derailed a bit.
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