Featured Post

Site Navigation is in the Left Column

Monday, February 22, 2021

Pressure Sensor Coding Done

I have developed the driver for the pressure sensor.  It appears to be functioning correctly.

Thursday, February 11, 2021

The Parts have Arrived

The relays are mounted and wired to the board.

The Pressure sensor has its contact points soldered in.

Wednesday, February 10, 2021

Ordered Relay Array

I ordered a 4-relay I2C control module and 4-40 amp zero-crossing solid state relays.  These will be used to control parts of the freeze dryer, such as the compressor, the vacuum pump, the second stage cooling unit, the cooling fans in the two cold chamber etc.

Ordered Pressure Sensor

I ordered the pressure sensor for the vacuum chamber.  I found the MPRLS0025PA00001A pressure sensor.

It has a 24-bit Analog-Digital-Converter reading a max pressure of 25 psi.  

It also has an I2C interface