Had some spare time, two resistors and a pico on my desk.
Use the resistors in series, power from GPIO pin and measure adc values as indicated.
Pretty simple. Here the setup (excluding the pico)The values shown are measured with multimeter.
The interesting point is: when I move the brown wire , ADC1 from the right resistor column 47 to the left resistor column 44, then I expect the same voltage. But the voltage on the ADC changes by almost 200mV (!). Hence the attempt to use two connectors (green wires), but did not change too much.
The resistor of 2193 gives measured results of 1747 Ohm or 2326 Ohm depending on this connection.Guess the breadboard is playing an important role here.
Use the resistors in series, power from GPIO pin and measure adc values as indicated.
Pretty simple. Here the setup (excluding the pico)
The interesting point is: when I move the brown wire , ADC1 from the right resistor column 47 to the left resistor column 44, then I expect the same voltage. But the voltage on the ADC changes by almost 200mV (!). Hence the attempt to use two connectors (green wires), but did not change too much.
The resistor of 2193 gives measured results of 1747 Ohm or 2326 Ohm depending on this connection.
Statistics: Posted by ghp — Fri May 03, 2024 10:39 am