Atmel Standard Reset Circuitry

One very common thing to use when embedding a micro controller into to a project especially robotics projects is a reset switch. The ATMega family of micro controllers from Atmel have the luxury of a reset pin. However using this feature can pose problems, especially when used incorrectly.

Whilst working on a previous project i found that the program was resetting at random, i later found this was because the reset circuit was done incorrectly.

The following is the standard reset circuit that Atmel recommend using:

ATMega Standard Reset Circuit

Normally when i use this i like to use a Tactile Push Button switch and 0805 surface mount caps and resistors, this makes the entire reset circuitry fit in about 1cmx1cm.

Enjoy

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