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Datalogger V3 digital pins from arduino connected to switches measuring lower than 5V #4

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ltan10 opened this issue Mar 3, 2021 · 0 comments

ltan10 commented Mar 3, 2021

Testing Method: Uploaded Following script

void setup() {
    pinMode(8, OUTPUT);
    pinMode(22, OUTPUT);
    pinMode(A1, OUTPUT);
}

void loop() {
    digitalWrite(A1, HIGH);
    digitalWrite(22, HIGH);
    digitalWrite(8, HIGH);
    delay(5000);
    digitalWrite(22, LOW);
    digitalWrite(A1, LOW);
    digitalWrite(8, LOW);
    delay(5000);
}

Observed D22 HIGH at 4.84V
D8 HIGH at 4.83V
A1 HIGH at 5.11V

Suspect impedance of BJT, n-fet pulldown and atmega pin impedance to contribute to voltage drop.
Able to ignore for the moment 2021-03-03

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