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USB pass-through and modify on a microcontroller
Recently Playstation to XBOX 360 converters have become available. They defeat the 360's protection system by using a wired 360 pad in a pass-through configuration. The 360 talks...
Thursday, 1 July 2010 - 23:14
MCUs with USB in DIP package other than PICs
I really like the USB AVRs but the only issue I have is that they are not available in DIP format. For various reasons I won't get in to DIP is preferable to TQFP. Ruling out PICs...
Thursday, 17 June 2010 - 23:27
Used Tek 'scope or new Owon/Rigol/Hantek/etc
I am looking to get a digital oscilloscope and am trying to decide between a used Tektronix and a new Chinese one. I am a mostly doing stuff like LED display control and power...
Tuesday, 9 March 2010 - 14:03
Slow TWI clock
Hi. I am trying to interface with a DS1307 real-time clock on an ATmega8. For some reason the I2C clock seems to be running very slowly: ~13Hz. I have tried changing the...
Sunday, 17 January 2010 - 11:19
5V AVR to lower voltage LEDs without resistors
I am looking at ways of reducing the amount of work involved in building a circuit that uses 7 segment LED displays. I want to avoid needing 8 resistors per display. The obvious...
Thursday, 15 October 2009 - 23:20
How to generate an interrupt when input falls to ~3.9V
I am working with a DCF77 decoder, but it only produces an analogue output which varies from 4.9V (near the 5V rail) to about 3.5V. I need to convert that to digital levels to...
Friday, 2 October 2009 - 19:01
Preventing an ADC pin from floating
Hi. I want to connect one or two analogue joysticks to an AVR. They are just simple pots with the wipers connected to the ADC pins. However, there are some interesting challenges...
Friday, 11 September 2009 - 22:53
Connect unused ADC pins to VCC?
I am using a ATmega168 in TQFP package. It has two pure ADC pins, ADC6 and ADC7. They are not multiplexed with digital I/O so there are no pull-ups on them. It is okay to tie them...
Sunday, 12 July 2009 - 16:55
Length of PCB traces for crystal
Hi. I am designing a PCB and due to limited space it is going to be hard to have equal length traces for the connection from the crystal to the two clock pins on the AVR. One...
Wednesday, 8 July 2009 - 18:37
Simulating external SRAM in AVR Studio
Hi. I am writing a project that needs quite a lot of external SRAM, 256k in fact. I am using an ATmega162 which supports up to 64k SRAM, and I intend to bank switch the actual...
Monday, 11 August 2008 - 21:45
Why is -O0 broken? Why were sbi() and cbi() removed?
I have noticed that there seem to be a lot of problems with compiler optimisations. Worse still, some troll as managed to get the sbi() and cbi() functions removed from AVR-LIBC...
Tuesday, 22 April 2008 - 14:24
Getting a rotary encoder to work reliably
I am working on a project that will ultimately be being built by other hobbyists, and it uses a rotary encoder with 2-bit gray code output. I am having trouble reliably decoding...
Friday, 4 April 2008 - 03:03

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