The oled screen simply plugs in over the arduino which made for a nice compact board.
Arduino vacuum gauge.
Acrobotic bme 280 temperature humidity barometric pressure and altitude sensor breakout board for arduino raspberry pi esp8266 3 5vdc bme280 altimeter bmp280 upgrade 5 0 out of 5 stars 3 10 99 10.
When the 5v changes the resulting measured pressure does not change and is still accurate.
Power them with the arduino 5v and use the arduino 5v as analog reference that is the arduino default setting.
This had to be changed to a 0 5vdc range using a potential divider so it was compatible with the arduino.
Luckely they have also a vacuum sensor with a large range for example the mpxv6115v.
Pressure measurement methods air pressure measurement using mpx5010dp.
The vacuum gauge outputs 0 10vdc.
Absolute pressure is referenced to the pressure in a vacuum whereas gauge and differential pressures are referenced to another pressure such as the ambient atmospheric pressure or pressure in an adjacent vessel.
Initial build used a 10k pot in place of a vacuum gauge to make it simpler.