If I do a program which has to control only one sensor, it works. The following example shows how to implement the bounded buffer problem using the protothreads semaphore library. Here is some C switch-while hackery going on. Arduino's great, but how in the world do you do two or more things at once on separate intervals? There are also Wiring and SoftTimer but I did not try those. Arduino Playground is read-only starting December 31st, Variable Scope - An explanation of scope or variable visibility in an Arduino sketch. 
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Hyperthreading would emulate a second core and literally divide the work one core is doing by pretending to be two virtual cores. There are also Wiring and SoftTimer but I did not try those.
This is the first reason Protothreading is not multithreading - we only have one core to work ardduino on an MCU, so traditional multithreading is straight up impossible.
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Arduino Protothreads [Tutorial]
Serves also as an introduction to doing several things at once. The program will pause the execution of this thread until the condition is true.
Serial comm ports for everand ever, and ever This example shows a simple communication protocol that uses protothteads absence of acknowledgment packets to detect a lost packet.
Why to use Arduino protothreads? The main goal of the library is to provide a arduinp way to write programs for event-driven systems in memory constrained environments like micro-controllers.
When time is up, after about milliseconds since last time, in, say leggithreadthe variable is reset. Enter multicore CPUs, and multithreading. Going lower level than this overview get's fairly technical so I'll leave that as an exercise to the reader, but that's the gist: Determining the shutter speed of a digital camera. The driver is implemented both with protothreads and with an explicit state machine.
Protothreads - download
In the protothread function you can check this flag and power on the LED accordingly. Instead, they allow you to write your code in a different way, which may be optimized when you have ardulno lot of tasks to execute, or a state machine you want to simplify.
The following example shows a function writing text to a one-line LCD panel.
If so, we branch off and go do it. DIY Arduino based capacitance meter. Stack Overflow works best with JavaScript enabled. Toggle navigation Adam Dunkels. Home Questions Tags Users Unanswered. There are libraries ptotothreads can do just that for you.
Math Bit Math Tutorial: Why have you put while 1 in your function? Arduino on other Chips. Sign up using Facebook.
It's probably best to read through the code at this point - it is heavily documented. But it doesn't work In this case, we're: So I used protothreads! Now the problem is the ultrasonic sensor.
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