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UART 5V -> 3V Converter
DocJC wrote:At 9600 baud this will be fine. You need to look up resistive dividers and Ohm's Law. Hope this helps get you back on track with the rest of your project. JC Thanks a...
Thursday, 6 January 2011 - 06:57
UART 5V -> 3V Converter
DocJC wrote:Quote:I would go with NPN transistors – one for transmit and one for receive. Aero1, Wouldn't two transistors be required, if using only NPNs? The first one would...
Thursday, 6 January 2011 - 00:50
UART 5V -> 3V Converter
Simonetta wrote: +5v +3V | -------- R 1K R 220----------------------1| 4N25 |-+------ Rxd TxD...
Thursday, 6 January 2011 - 00:49
UART 5V -> 3V Converter
Why do we need to step up? According to Atmega datasheet, (atmega644P in particular), 3V is considered high. So, why we still need step up? Confused...
Thursday, 6 January 2011 - 00:47
UART 5V -> 3V Converter
The Tx of MCU, can I use this method to reduce the voltage? The start bit is logic low right? 3V3 | R 10k...
Wednesday, 5 January 2011 - 06:31
UART 5V -> 3V Converter
Do I have to step up? 3V is considered high for MCU (TTL)
Wednesday, 5 January 2011 - 05:42
W5100 AVR Port Unreachable!
ArnoldB wrote:You have no listening port for the particular protocol. Yes, you are right. After troubleshooting for 4 hours, finally I found that I overlook that part. The port...
Thursday, 30 December 2010 - 15:47
EasyAVR6 and speaker
fidekk wrote:I just bought Mikroelektronika EasyAVR6 development board and I'd like to start learning to do some stuff :) I'd like to connect a tiny sepaker to my ATMEGA16 but I...
Saturday, 25 December 2010 - 03:42
Using the UART as a bus
Why reinvent the wheel? Use 1-wire protocol from Dallas.
Saturday, 13 November 2010 - 02:34
Servo Motor Control Using Atmega169
They are so many posts in AVRfreaks abt controlling servo using Atmega. Just do a quick search will give you lots of hints and guidance.
Friday, 12 November 2010 - 10:37
5 wire stepper motor
Or use this cct if more than 500mA. Note, if your stepper motor use more than 500mA, you need heat sink. The transistor will become very hot!
Friday, 5 November 2010 - 12:38
5 wire stepper motor
You can try this simple cct using ULN2003 (200mA? forgot, check datasheet). Or use ULN2803, if your motor is rated 500mA or less.
Friday, 5 November 2010 - 12:31

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