It has been a while ....I did soldering long long time ago.... Cannot remember how I finished all the course work - analogue, digital circuits , PWM , assembler, micro controller and so on.
Now, I brought my interests again - This is Arduino Uno (upper part) made by Italy and with micro controller chip and BUB (lower part) It took two hours to finish soldering according to design spec.
And tested Arduino example source code to verify all the receiving/transmitting parts are working correctly for half an hour.
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