Hello everyone,
I want to measure the Voltage of big a Battery which has a voltage range of 19.5V-29.4V. I want to use the ADC of a teensy 4.0 board and since the input only allows 3.3V at max I need a voltage divider.
The circuit below shows the basic concept. I randomly selected R1 to be 50k Ohm and R2 to be 6k Ohm. At 29.4V this would mean 3.2V at the teensy input.
The battery has an integrated BMS which prevents it from reaching higher Voltages. For redundant security, would clamping diodes work?
Are the choosen resistor values good?
What do I need to consider when it comes to accuracy, sampling speed and impedance when selecting resistor values?
Do I need any other circuitery?
Thank you very much in advance!
Kind regards
I want to measure the Voltage of big a Battery which has a voltage range of 19.5V-29.4V. I want to use the ADC of a teensy 4.0 board and since the input only allows 3.3V at max I need a voltage divider.
The circuit below shows the basic concept. I randomly selected R1 to be 50k Ohm and R2 to be 6k Ohm. At 29.4V this would mean 3.2V at the teensy input.
The battery has an integrated BMS which prevents it from reaching higher Voltages. For redundant security, would clamping diodes work?
Are the choosen resistor values good?
What do I need to consider when it comes to accuracy, sampling speed and impedance when selecting resistor values?
Do I need any other circuitery?
Thank you very much in advance!
Kind regards
