![]() Here is the code example for this test procedure. Micros ( ) function calls with direct pin access to eliminate the execution time effect of theĭigitalWrite ( ) function and also avoid any effect introduced by the implementation of the micros function itself.Īnd I’ll run the test code on both the simulation environment and a real Arduino board with an oscilloscope to check if things are going to align or not. Micros ( ) function implementation itself.ĭelayMicroseconds Accuracy Measurement Test2 So it’s something consistent and I believe it’s inherent in the I went up to a 600µs time delay and it was printing 600s and 604s as well. Which will stay the same whether you increase or decrease the delayMicroseconds time period. It’s a little bit better but still, there is a consistent random 4µs error. But for the sake of testing, I’ll modify the code and run the test again.Īnd here is the result for running the modified test code example above. ![]() One solution can be to disable interrupts before the “short microseconds delay” and re-enable interrupts afterward. It turned out to be due to having interrupts that pause theĭelayMicroseconds ( ) function execution causing it to take more time than expected in a non-deterministic way. Which is a significant fluctuation in the resulting pulse width (around 10µs), and it’s sporadic in time. The behavior I’ll describe here is consistent and easily observable in both simulation environment and in real-world testing. It’s nearly the same as what we’ve seen in the simulation environment. Here is the result of testing this project on my Arduino UNO board as captured by my DSO (digital storage oscilloscope). This article will give more in-depth information about using proteus ISIS for Arduino projects simulation. ![]() There are 1000 microseconds in a millisecond and 1,000,000 microseconds in a second. And it can be acceptable as long as it’s a few µs time delay.ĭelayMicroseconds ( ) function pauses the program for the amount of time (in microseconds) specified as a parameter. Things like short pulse generation, triggering a sensor or external electronic circuit, or forcing the CPU to wait for a short time period before attempting to execute a certain piece of logic.ĭespite the fact that using a delay function is not generally preferred, it’s still a very popular option for various use cases. Occasionally, you might need to insert a very short time delay to achieve certain functionality for your Arduino projects. But in this tutorial, we’ll go down to very precise time delay intervals generation down to 1µs and measure the accuracy of the Arduino delayMicroseconds built-in function. In a previous tutorial, we’ve discussed in detail the Arduino delay() function and how to use it in your Arduino projects to generate time delays in milliseconds and up to 25 days. The Need For delayMicroseconds in Arduino
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