Hello all,
First time poster and a newbie to the Teensy range!
I've recently picked up two Teensy 4.1 boards to work on a project where I hope to bring multiple 0-5V sensors on a car (temperature, pressure etc) into the Teensy and broadcast these over a CAN bus to other devices.
Reliability is key for this application so I want to ensure that I do not accidentally supply more than 3.3V to any of the analog inputs and end up damaging the board.
As I mentioned above, the signals I am dealing with are typically 0-5V, so I will need to use a voltage divider to bring the 5V input down to 3.3V at the analog input pin.
My current approach is to set R1 and R2 to 2.4K and 2.2K respectively, meaning I can have Vin at up to 6.9V without Vout (to the analog input pin) exceeding 3.3V.
I will connect a 10nF capacitor between Vout and GND to reduce noise.
While the voltage divider will keep the expected input voltage range within safe limits, I need to provide some protection against accidental application of voltage in excess of the 0-5V (or 0-6.9V as described above).
I've seen a few approaches to achieve this, the most simple of which appears to be use of a 3.3V zener diode between analog input pin and ground.
Does this approach sound reasonable/sufficient or am I missing something obvious here?
Really appreciate any advice which can be provided and apologies for my basic skill level!
Regards,
Cal
First time poster and a newbie to the Teensy range!
I've recently picked up two Teensy 4.1 boards to work on a project where I hope to bring multiple 0-5V sensors on a car (temperature, pressure etc) into the Teensy and broadcast these over a CAN bus to other devices.
Reliability is key for this application so I want to ensure that I do not accidentally supply more than 3.3V to any of the analog inputs and end up damaging the board.
As I mentioned above, the signals I am dealing with are typically 0-5V, so I will need to use a voltage divider to bring the 5V input down to 3.3V at the analog input pin.
My current approach is to set R1 and R2 to 2.4K and 2.2K respectively, meaning I can have Vin at up to 6.9V without Vout (to the analog input pin) exceeding 3.3V.
I will connect a 10nF capacitor between Vout and GND to reduce noise.
While the voltage divider will keep the expected input voltage range within safe limits, I need to provide some protection against accidental application of voltage in excess of the 0-5V (or 0-6.9V as described above).
I've seen a few approaches to achieve this, the most simple of which appears to be use of a 3.3V zener diode between analog input pin and ground.
Does this approach sound reasonable/sufficient or am I missing something obvious here?
Really appreciate any advice which can be provided and apologies for my basic skill level!
Regards,
Cal