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Analog ground and AREF on ATMega6450 when not using ADC
I'm working on an ATMega6450 design that won't be using the ADC.  The data sheet says to connect AVCC to VCC in this case, but says nothing about AGND or AREF.  Should...
Monday, 3 October 2016 - 04:36
Sharing JTAG pins with outputs
I'm working on an ATMega6450 design where I'll be using all the IO pins.  Programming and debug are via JTAG, but I also need these pins for output.  They'll be driving...
Monday, 19 September 2016 - 00:28
How to filter out a power-on spike?
I have an ATTiny85 design that I power from a 24VDC wall wart.  My circuit has an LDO generating 5VDC from the 24VDC (there are no other active components on the 5V rail so...
Wednesday, 7 September 2016 - 01:09
How does an SPI slave know it's received new data?
I'm thinking of using SPI in a project, specifically in daisy-chain mode where I might have 10 slaves and one master (all ATMegas of a variety TBD).  How does a slave know...
Saturday, 16 July 2016 - 18:56
Seeking tips on interfacing to 24VDC
I need to interface an ATTiny841 to an industrial controller that uses 0V - 5V for a logic 0 and 12V - 24V for a logic 1.  To output from the 841 to the controller I'm just...
Tuesday, 5 January 2016 - 18:39
Using current sensing with a servo motor to measure force
I'm going to be building a servo motor-driven two-finger gripper for a robot whose gripping force I need to measure.  I'm thinking of using AVR-based current sensing on the...
Tuesday, 29 December 2015 - 07:04
Seeking Atmel Studio 6
My system crashed and as I reinstall everything I notice I don't have a copy of AS6 and Atmel only has AS7 on their site (as far as I can tell), which I don't want.  Can...
Monday, 16 November 2015 - 21:12
Should fuses be set first during in-system programming?
I'm having some trouble bringing up a new ATTiny841 board, so I'm trying to think of everything I might be doing wrong.  One thing that comes to mind is the order in which I...
Wednesday, 15 July 2015 - 18:06
Unable to erase ATTiny841
I'm bringing up a new PCB using an ATTiny841.  Via Atmel-ICE, I can read the device signature and set fuses (I've set SUT_CKSEL to EXTCRES_8MHZ_XX_1KCK_16CK_16MS for a...
Tuesday, 14 July 2015 - 20:29
ATTiny841: timer problem
I'd like to create a 5-second timer based on Timer1.  In the code below, I'm running off a 16 MHz external crystal, divided down by 1024.  The counter counts up to 16,...
Wednesday, 1 July 2015 - 20:03
Tips on selecting a crystal for an ATTiny841
I've built a number of AVR projects, but I've always used either the internal or an external oscillator.  I'm starting a project now that I'd like to use an external crystal...
Monday, 22 June 2015 - 21:53
"Unable to enter programming mode."
I'm running AS6.2 and Atnel-ICE on Win7 Pro x64, targeting an ATTiny841 via debugWire.  Everything was working fine yesterday (I could program and emulate), and I was careful...
Saturday, 20 June 2015 - 00:42

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