Read battery percentage using Arduino
vijayvarghese last edited by
Is it possible to read battery info of an Android with an Arduino via Bluetooth without an external app on the Android side .
For example . Bluetooth connection to a cars media player shows battery life , signal strength ,etc....
kowshik1729 last edited by
@vijayvarghese The answer is "NO". If my guess is correct, you might have misunderstood the working of Classic Bluetooth and Bluetooth Low Energy(BLE). You cannot acquire battery percentages, RAM usage directly just by connecting HC-05 to Arduino and connecting it to mobile phones. Because our mobile phones don't share any characteristics to outside just through Bluetooth.
The example of car which you have stated is just applicable to the automobile field. If you are able to read the battery percentage, signal strength kind of parameters that means that the car's BLE has been programmed with those characteristics to be displayed. To be simple, it means that the Bluetooth inside the car has been given permission to display those. It depends upon the BLE configuration used and security levels. You cannot access any parameters from mobile phone just with Arduino and HC-05 Bluetooth module.
If you want to learn more about this please read the post in makergram named "Automatic pairing of ESP32 using BLE" where @salmanfaris has given a detailed explanation of how BLE works. If you want to work out how BLE's work, try connecting your MI Band(Or any smart wrist bands) to the nRF Connect Mobile app(Can be found in play store for free). Try seeing what parameters are displayed. please write back in case of queries.!!
vijayvarghese last edited by
@kowshik1729 Thank you ..
@Richu-Bini thanks for posting the question . just for a brief about pwm, pulse width modulation technique is a method to change the duty cycle of a wave. Which means you can determine how much time a signal must be on or off.
So, coming to the question, software pwm and hardware pwm is just two different ways of producing same result. In software(referring Arduino here) you'll just write a value between 0 to 255 inorder to determine duty cycle percentage. For example 0 is 0% duty cycle which means the cycle is on for 0% of whole time, similarly 127 means 50% of time cycle will be on and 255 means signal will be on for ever. This is regarding software.
Coming to hardware, you can generate a pwm signal using very simple passive component, called as potentiometer and 555 timer IC by using 555 timer as bistable multivibrator(The generated output will have two stable states 0 and Vmax, hence the name bistable) and changing the resistance using a potentiometer generates different duty cycles. This is the difference between hardware and software pwm. Please let me know if I haven't explained what you have expected.
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What is the difference between hardware pwm and software pwm
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