Hi everybody,
I use this board: esp32-c3-supermini and cant get correct values for joysticks with analogRead().
Joystick voltage output is 2.53V but analogRead() returns ~3500-3700 range values.
Board and Joysticks powered with 5V both.
Any ideas what is wrong?
the code:
map_joystick_value(analogRead(pin_x1), mid_x1, false);
uint8_t map_joystick_value(int16_t value, int16_t mid_value, bool isYAxis) {
Serial.println(value);
}
setup:
It sounds like you have a 12 bit ADC which will return values in the range of 0 to 4095. You can map those to whatever range you desire.
its 12 bit ADC for sure,
the 2.5V (5V / 2) value should be ~2045 (4090 / 2),
but analogRead() returns ~3500 so that is wrong value
Is 5V your Vref?
Have you tried swapping parts?
ESP32 is a 3.3 device.
It returns 4095 at 3.3 volts. So at 2.5 it should read approximately 3100.
Everything is correct with your readings.
Don't feed more than a 3.3 volts to its ADC: anything above 3.3 will read as 4095.
i see,
so should I divide joysticks output or what is the solution?
If your joystick output is 0..5v then you need a voltage divider: two resistors 1k and 2k.
thanks for your explanations,
is divider the only solution for that hardware?
A voltage divider is the standard and highly recommended solution.
Is not possible to connect the sticks to the 3.3V line?
The joystick doesn't contains any elements that sensible to supply voltage:
So you can use it even with 1.8v logic level
Most folks just use the map function.
I powered board and joysticks with 3.3V and it looks like it works fine.
Thank you guys for your help.
