New answers tagged voltage
3
In my Raspberry Pi tablet, I use very low frequency PWM to measure the battery voltage. One half of a dual voltage comparator was set up as a sawtooth oscillator operating at approximately 100Hz. The output of this was compared against a divided-down version of the battery voltage by the other half. The output of that in turn was tied into a GPIO pin.
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3
The PiCheckVoltage project may be stale for a reason. It strikes me as a bit over-complicated for the situation you've described. However, parts of the code may be useful. Here are some alternatives to consider:
1. Use "protected" 18650 batteries?
18650 batteries can be bought in a "self-protected" configuration.. You probably knew this ...
4
Why not go for a dedicate i2c monitor / controller - the boards are available for a few pounds on Ali et al and not much more at end user prices?
The INA219 will measure voltage and current, cope with up to 25+ volts and come on boards ready built.
3
One option would be to use an MCP3002 ADC (2 channel analogue to digital converter).
Use a voltage divider circuit (2 resistors) to convert your battery voltage to a voltage range upto 3.3V. Feed this into one of the analogue channels on the MCP3002.
0
Both voltages are tolerated by the Raspberry Pi 3B, but official documentation actually suggests 5.1V.
Higher voltages usually mean more power if the amperage is the same. Also a higher voltage might give a little more heat output, but 0.1V is very negligible.
I suggest using the 5.2V as some of it will be lost to the inefficiencies of cabling.
Source: Power ...
1
No, the GPIO pins can not be used to drive a DC motor.
They can only supply a few milliamps of current at 3V3 which will not be enough. In addition driving any inductive load direct from a GPIO is likely to destroy the GPIO and the Pi. An inductive load is such as a DC motor or a relay coil.
You need a motor driver board or chip or discrete components (e.g. ...
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