Comments on: Home Made AVR Devboard

By: pp

pp — Sat, 13 Mar 2010 05:17:17 +0000

i want to make the development board for atmega16 …….is there some ckt diagram for this

By: Rohit Sharma

Rohit Sharma — Sat, 06 Mar 2010 04:05:15 +0000

You know Avinash , you are a good guy.

I really like the tutorials, (party because i had summer training on Atmega microcontrollers) these tutorials really helps and i am looking forward for more (specially on wireless module [read Zigbee])

By: Ramesh

Ramesh — Tue, 12 Jan 2010 10:17:29 +0000

Hi Avinash
really gr8 job

By: Avinash

Avinash — Tue, 15 Dec 2009 03:04:43 +0000

@Mitesh

Thanks! We are in Jamshedpur. I can also send these to you by DHL Express. We export many Items by DHL Express. Please tell me your background. Do you have experience in E business or Bussiness Related to electronics? Then you may represent us in USA. After India our Most of our Visitors are from USA and its a Great Market.

PLEASE REPLY TO MY EMAIL avinash [ at ] eXtremeElectronics.co.in

By: Mitesh

Mitesh — Mon, 14 Dec 2009 22:31:46 +0000

Hi Avinash,
Nice kits! I am in the US (used to live in Hyderabad) and can purchase these from you and sell them here in the US. I have friends/family that routinely fly back and forth. Which city are you located in? If it is Hyderabad/Bangalore/Chennai, I can have somebody purchase some of them and get them to me over here.
Thanks.
Mitesh
aminmitesh@hotmail.com

By: Rohit

Rohit — Thu, 10 Sep 2009 23:24:04 +0000

you are doing good work, looking forward to your tutorial on rf transceiver.

By: Zvonimir Cicak

Zvonimir Cicak — Sun, 02 Aug 2009 11:38:33 +0000

I’m interested also if you can give pcb layout of your Devboard so we can make it at home…

By: Suhas

Suhas — Wed, 13 May 2009 10:21:55 +0000

Hey, Is it possible for you to provide the PCB design of the Devboard?
I am interested in making one myself.

By: Avinash

Avinash — Thu, 30 Apr 2009 02:19:11 +0000

Hello Raul,

Please check connections. Communication with Programmer < -> Micro is not ok.

Yes devboard should be powered while programming.

Keep all cables as short as possible. Check DB9 PIN connections. Select Correct COM Port.

If all else fails buy a ready made USB Port based programmer from here

http://shop.extremeelectronics.co.in/product_info.php?cPath=21&products_id=28

By: Raul

Raul — Sun, 26 Apr 2009 13:22:09 +0000

Hello,
I have to do a project using ATmega16 and i make your Home Made AVR Devboard and the programmer for serial. I use PonyProg .
And…i have some problems:
I connect the programmer and Devboard to the PC serial, and when i tray to read the fuse bits, i receive the next error: “device missing or unknown device -24″, i clink the Ignore button and finally read the fuse bits, but all are selected.
When i tray to write o small program into controller (i tray to on/off a LED)i receive the same error; i hit the Ignore button, PonyProg write something, verify something, but finally he says : “Write fail!!”.
So … what is the problem? I skip something??
One more question: when i write something into controller , the Devboard must to be power ?(i tray the both )

By: Seemanta

Seemanta — Thu, 26 Mar 2009 20:01:49 +0000

Nice pictures man! I really liked you site. I too am a hobby embedded developer!

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By: AL

AL — Sat, 18 Oct 2008 18:57:50 +0000

Found it!

http://www.atmel.com/dyn/products/datasheets.asp?family_id=607

By: AL

AL — Sat, 18 Oct 2008 17:04:13 +0000

Hi,

Thanks for the answers. That helps a lot. I happen to find ModernDevice’s tiny Atmel dev board. It’s very interesting. See http://www.moderndevice.com/RBBB_revB.shtml.

In your answer, you referred to page 202 for the “ADC Noise Cancellation Techniques.” All the Atmel datasheets I looked have 22 or pages not to 200+ pages. They do refer to those pages as well. I kept searching and searching on the atmel.com site but can’t find the complete (200+ pages) of the atmel datasheet. Do you know the link by any chance?

Thanks.

By: Avinash

Avinash — Fri, 17 Oct 2008 03:28:28 +0000

Hi AL,
The ceramic capacitors (0.1uF) are Decoupling capacitor capacitor. They are used to decouple the power supply from the MCU. The advantage is they bypass the spikes frm the power supply. They are placed close to the MCU. The standard value used for this purpose is 0.1uF ceramic disk type.

The C1 (100uF) is used as a filter capacitor. Its purpose is to further smooth the In put DC input which you may supply from a transformer. Its value is not so important just select is according to the current requirement of the circuit. It the circuit is a consuming one you can increase it (470uF or even 1000uF).

The two capacitors 22pF connected to the Crystal. Their value is suggested in the ATmega8 Datasheet (see page 27)

The L1 (inductor) C7 is used as suggested in the dataseet page 202 “ADC Noice Cancelling Techniques”.

So Now you know how the value are calculated you can go ahead and start building !!!

For any help we are here

The C6

By: AL

AL — Thu, 16 Oct 2008 21:21:53 +0000

Hi,

This is great! Just like the board sold by sparkfun.com but better I am a very beginner with microcontrollers and circuit designs. Would you kindly explain how you come about to use capacitors and the L1? I know the capacitors would smooth out the voltage to make it more stable, etc. But how did you come about the capacitance values?

What kinds of tolerances in your resistors and capacitors, e.g., 1%, etc.?

Thanks. And GREAT WORK!

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