GPIO Pull-up/down resistor value Raspberry Pi Zero WH 測定 内部プルアップ/ダウン抵抗値
3.284V 1.590V up-internal down-473
1.590V/3.284V=473/(473+X) -> X=50KΩ approx.(Pull-up)
3.284V 1.596V up-473 down-internal
1.596V/3.284V=X/(473+X) -> X=44.4KΩ approx.(Pull-down)
min50KΩ – max65KΩ 公式サイト

I2C Pull-up resistor value Raspberry Pi Zero WH 測定 内部プルアップ抵抗値
3.284V 3.174V up-internal down-473
3.174V/3.284V=473/(473+X) -> X=1.628KΩ approx.(Pull-up)