i have a project that i am working on (simple 3W RGB LED mood light driven with a ULN2003 darlington transistor array). i have the source code in my uno board. the question i have is the uno has a 16 mhz crystal for the clock signal. without the crystal it run at 8mhz internally. is there anything in programming that has to change to work the circuit. i am wanting to take out the atmega 328 chip and use it without the arduino uno board. all advise is appreciate. i have searched over the internet and forum but cant find the answer im looking for.
thanks that's exactly what im looking for. the resonator is the answer. makes sense. im assuming the extra pin on the resonator is for the caps builtin vs. the crystal and caps.Correct so after i upload my sketch on the uno board then i remove the chip, add a 16mhz resonator and +5VDC power supply and finish adding the ULN2003 and RGB LED. right?Well most recommend a 10k pull-up resistor for the reset pin (chip pin 1). And possibly a 10k ohm pull-up on arduino pin 0 (chip pin 2) to prevent the bootloader from responding to noise inputs on the rec pin. Also a couple of .1mfd bypass caps between the two Vcc pins (chip pins 7 & 20) and the ground pins ( 8 & 22) are highly recommended, mounted close to the chip. Having a manual reset switch is an option you might consider or not.Lefty
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