![]() #define Gyro_Sens 0.00333 // Gyro sensitivity = 3.33mV/deg/s I am a novice on programming the Microcontroller so plzz provide me source codes and useful links for the same! Also recommend me a good IMU too! I actually wants to interface it with a 6DOF IMU so that I can get visual data on my computer from it. Routines are included to calculate the Julian date and convert it back to the Gregorian calendar.I have an Arduino UNO R3. The date is held as a Julian date, which is the number of days that have elapsed since Monday, JanuBC. Adjust time for slow/fast running Arduino clock At the end of each hour adjust the elapsed time for Note that we disable interrupts while manipulating the currentTime variable otherwise the interrupt call could be triggered in the middle of the calculation to deduct millisecondsInADay corrupting the calculation.Īfter each hour has passed, the system adjust the number of milliseconds elapsed by the speed adjustment we calculated earlier, adjusting the current time to compensate for the fast or slow internal clock. Set the CTC mode Compare time and trigger interrupt we are using our own millisecond counter which we can reset at Set up time interrupt - millis() rolls over after 50 days so This diverts the interrupt used to maintain millis() so millis() and delay() will no longer work. The following code will set an interrupt that will trigger every millisecond. The main areas of interest in the clock code are the setting of the interrupt, how this is used and the way the date is held and manipulated. If you do not have Processing installed, visit where you can download and learn about it. The code for the Arduino program and the Processing script are provided below. This gave the number of milliseconds that had been lost or gained in an hour and therefore the value to use for the speed adjustment in the clock program. I therefore created a program for the Arduino to send the number of milliseconds elapsed since handshaking to Processing once every 2 seconds and a script for Processing to read this and compare it to its elapsed milliseconds displaying a real time result and the difference after an hour had elapsed. To assess the inaccuracy, I made the assumption that my computer clock, and hence the millis() in Processing was accurate. Hence, the answer was to replace the millis() interrupt using a counter that I could manipulate and that would count the milliseconds from midnight, resetting each day removing any run time restrictions. The second issue is that the internal millis() function resets itself every 50 days or so and you cannot manipulate the millisecond count. My other concern was whether the Arduino clock was consistently inaccurate, but as indicated, the clock I programmed has maintained very accurate time over 5 days so it appears that the inaccuracy is consistent. All that was then needed was to program a speed adjustment to add or deduct this difference from the internally tracked milliseconds each hour. My approach was to test the accuracy of the Arduino I was using and determine how many milliseconds it lost or gained per hour. Hence if you just rely on this then the count of the milliseconds elapsed will be out by a small percentage and the clock you are creating will either loose or gain time. The main issue with using just an Arduino is that its internal clock speed is not 100% accurate. After running for 5 days, it had not lost or gained any time. I started this as an academic exercise, but ended up with a very accurate clock.
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