![]() It has a USB host interface to connect with Android based phones. TimerCounts = (overflowCount << 16) + timer5CounterValue // each overflow is 65536 moreįloat frq = (timerCounts * 1000. The Arduino MEGA ADK is a microcontroller board based on the ATmega2560 (datasheet). Timer5CounterValue = TCNT5 // see datasheet, (accessing 16-bit registers) External clock source on T4 pin (D47). TIMSK5 = _BV (TOIE1) // interrupt on Timer 5 overflow So this works: // Timer and Counter example for Mega2560 for those who asked me, the version with the pin number (not 1:1) and the Pinout of ATMega2560. OK, Timer 5 is connected to an external pin (D47 at the end). Revision 3 of the board has the following new features: 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to. Hi All, as promised, after the version of arduino uno, here is the diagram of Mega: NEW Version 2.0. I've marked important pin names like OC1A, RX, MISO etc ARDUINO MEGA:Ģ6 B7 OC0A,OC1C X 13 Arduino code ignorant of OC1CĤ0 L5 OC5C X 44 note OC5C not supported by analogWrite. In general, we recommend that you format the card before using it in any case. For example, if you have a small card, 8-32 megabytes, it can be formatted for FAT12, which is not supported. For some crazy reason the code tagged text isn't coming out in a fixed-width font alas. The Arduino SD library that we will use supports both FAT16 and FAT32 formats. ![]() Note that "pack" means the package pin numbers, not Arduino pin numbers which are in the final column. My shorthand list of pin outs (which may have mistakes, note) is given below. The pin assignments for the Mega are given in the relevant datasheet. adjust counts by counting interval to give frequency in Hzįloat frq = (timerCounts * 1000.0) / timerPeriod StartCounting (500) // how many mS to count for TimerCounts = (overflowCount << 16) + timer1CounterValue // each overflow is 65536 moreĬounterReady = true // set global flag for end count period Timer1CounterValue = TCNT1 // see datasheet, page 117 (accessing 16-bit registers) grab counter value before it changes any more ![]() Timer2 Interrupt Service is invoked by hardware Timer 2 every 1ms = 1000 Hz ++overflowCount // count number of Counter1 overflows GTCCR = _BV (PSRASY) // reset prescaler now TIMSK2 = _BV (OCIE2A) // enable Timer2 Interrupt OCR2A = 124 // count up to 125 (zero relative!!!!) So we count 125 of them, giving exactly 1000 uS (1 mS) 16 MHz clock (62.5 nS per tick) - prescaled by 128 Timer 2 - gives us our 1 mS counting interval TIMSK1 = _BV (TOIE1) // interrupt on Timer 1 overflow TimerTicks = 0 // reset interrupt counter TimerPeriod = ms // how many 1 mS counts to do these are checked for in the main program PS: This might help: // Timer and Counter example This is the sketch I am talking ying to decipher the pins for the compiles on the mega with no errors.
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