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Selecting a zener diode for solenoid flyback suppression
I'm low-side driving a 24V, 1.2A DC solenoid with a 30V MOSFET. I'd like to protect the MOSFET with a zener diode across the source and drain (cathode to drain, anode to source)....
Wed. Nov 14, 2018 - 02:56 PM
How to use memory mapped IO in ATMega32A
The datasheet for the ATMega32A shows the IO ports as being memory mapped.  E.g., the address for PORTA is given as 0x1B (0x3B).   1.  What's the difference between...
Mon. Aug 27, 2018 - 02:11 AM
External storage: USB or SD card?
I need to design a board that will have to access external, removable storage of less than 5MB.  The CPU needs to be an AVR with a USART and a handful of GPIO.  The most...
Fri. Jul 20, 2018 - 06:35 PM
Ateml-ICE fails to enter programming mode in AS7
I'm trying to program an ATTiny85 via Atmel-ICE and debugWire from AS7, but I get an error:   My devices seem to be set up correctly: What might be causing this?...
Mon. Jun 25, 2018 - 04:54 AM
OK to use a filter cap on RESET when using JTAG?
I'm designing an ATMega32A board, which is programmed and debugged via the JTAG interface.  The AVR042 app note recommends a .1 uF cap on reset unless you're using DebugWire...
Tue. Jun 5, 2018 - 09:33 PM
Reflowing a previously soldered board
In a week or two I'm going to bring up a new board I've designed based on an ATMega32A.  It has a 5V regulator fed from an external 12V supply, 16 MOSFETS, an RS485 driver,...
Tue. May 15, 2018 - 03:36 PM
ATMega32A: JTAG vs. debugWire
I'm starting a new design with the ATMega32A.  The chip supports both debugWire and JTAG, and I'm wondering what the benefits and disadvantages of each are.  I'll be...
Sun. May 6, 2018 - 05:59 PM
Have you ever driven a 16x2 I2C LCD?
I bought one of these inexpensive 16x2 I2C LCDs on Amazon.  There's no documentation, but I figured how hard could it be to get up and running, since I've used UART-...
Thu. Mar 8, 2018 - 04:59 AM
Seeking I2C app note code
I'm working my way through AVR315 (now AN2480) and it references TWI_Master.c and TWI_Master.h.  Atmel used to offer source code along side the associated app note...
Mon. Mar 5, 2018 - 03:51 AM
Unable to connect to Atmel-ICE
I'm doing some ATMega328P development with Jumpstart C and Atmel-ICE on Windows 10.  Everything was working fine up until a couple of days ago when the IDE stopped being...
Fri. Mar 2, 2018 - 07:37 PM
This is a test - ignore
Sorry.  Testing my malware blocker (Malwarebytes) which hasn't been letting me post here without disabling the entire app, despite the site being whitelisted.   Ed.:...
Mon. Feb 26, 2018 - 06:33 PM
Unable to connect to AVRISP MkII with avrdude
I'm brand new to avrdude and trying to accomplish my first flash.  I'm on a Win 10 system.  Whether I try to write or verify, I get the same error:   avrdude:...
Thu. Feb 8, 2018 - 04:48 AM

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