I was trying made a gear indicator for my bike, with manually sensing the gear shift. But failed, cause my bike has no separate "neutral" wire, instead there is gear sensor in-built...!! But not gear-position indicator...!!
The in-built sensor gives different output voltage at every gear.
It sounds good that all I need is just an Pro-mini & OLED. But, facing problem with the voltage reading on Pro-mini.
When I checking with normal multimeter, the output voltage is very stable.
I tried with the simple voltage reading code. And added the voltages ranges as shows on multimeter.
Later Checked with Uno, Reading is quite stable (+- 0.02V).
But, Pro-mini voltage reading is too sensitive. Sometimes, in same gear position getting high voltage difference. So, in result I doesn't getting a stable voltage reading or gear display.
Need suggestion to make changes, so the pro-mini also read like the multimeter / Uno reads. (Is this because of Pro-Mini doesn't have the Op-Amp in-built?)
And, also, Why the serial output is around 1.5V, while no input in A0...?
PS: I didn't use voltage divider, because, gear sensor output voltage is below 5V.