The software hacks include reducing clock speed, lowering operation voltage, and optimizing software code for low power. Irrespective of the Arduino board selected for a given application, designers almost always use Arduino sleep modes or power save modes to optimize power consumption.Īpart from selecting a low-power Arduino and using power save modes, some software and hardware hacks can be used to reduce power consumption. In such situations, the application may not be feasible or may get compromised using a low-power Arduino. Usually, low-power variants have fewer hardware features or fewer GPIO. Often, a low-power Arduino may not fit well to a particular application. An Arduino board selection cannot be solely based on operating voltage or power consumption. When low power design is the priority, designers first choose an Arduino board with lower operational voltage. There are several hacks and tricks that designers use to reduce the power consumption of the Arduino board. However, the net power consumption by the device still depends upon other components interfaced with the controller. Several measures can be applied to reduce the overall power consumption of the controller. Optimizing Arduino also makes it possible to ensure that the entire circuit is utilized most efficiently. In such a case, optimizing Arduino for low power consumption is essential. Such devices often deploy far from the power line to have periodic battery replacement or are mobile devices designed for periodic charging cycles. Arduino boards are often used in devices that rely on battery or solar charging. You can achieve this behavior without resorting to using sleep by using a timer object to periodically call a function that opens the serial stream (possibly flush it), reads the data, processes it, and closes the serial stream.Power consumption of the embedded controller is a primary concern in low power design. In this case you could have python sleep and use no delay (or a shorter delay) on the Arduino. If there is other stuff to be done on the Arduino (perhaps if you are doing some filtering of the temperature data using the Arduino so as to reduce noise) then it might make more sense for it to push data to the serial stream at the end of each loop, and for the python script to only read the data every 5 seconds. As such, It is pretty useful to explore python threading when you are writing a program which collects data over a serial stream unless the program is only collecting data. Note that readline will block your program from doing anything else while it waits. That said, I would make the timeout slightly longer than the delay on the Arduino side of things. According to the documentation readline will wait until it has received a value or until the timeout is reached. You don't need to deal with the timing delay in python if the Arduino is delaying. If there is nothing else to be done on the Arduino then it is fine to have it sit and wait on the other hand if there is nothing else for the python script to do then it is fine for it to sit and wait, but there is no reason for both of them wait. The answer is that it depends on what you are actually trying to accomplish.
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