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Nitrogen flush monitor
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RDickens/Packing-Machine
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Pressure Monitor Roy Dickens (rccdickens@yahoo.co.uk) Original date 20-09-2022 Copyright (c) 2022 CC BY Packing Machine Gas Indicator ---------------------------------------------------------------------------- This program checks that there as is a set pressure to the nitrogen flush solenoid when gas is requested. If no gas is present then an audible / visual warning is triggered for a set time then silences itself. This will also have a button to immediately silence it. If gas pressure returns then the alert will be cancelled and the program will return to monitoring the the pressure ---------------------------------------------------------------------------- Tolerance from 1 bar ~1.75v DIP (1 2) Tolerance Steps 00 0% 0 01 10% 20 10 20% 40 11 30% 60 Offset 102 Steps. Sensor range output 0.5v - 4.5v for 0 - 30 psi ---------------------------------------------------------------------------- To calibrate required gas pressure ---------------------------------- 1. Set pressure regulator on nitrogen bottle 2. Set DIP3 to calibrate 3. Press silence / calibrate button 4. Lamp and sounder will pulse 5. Reset DIP3 to normal 6. Set tolerance DIP switches 1 & 2 as req. ****************************************************************************** PINS USED A0 Sensor Analog Attached to pressure sensor A1 Button Digital Used to calibrate / silence depending on DIP3 A2 Pulse input Digital Attached to gas pulse wire A3 DIP4 Silence Digital Disables sounder silence timeout A4 DIP3 Calibrate Digital Used to enable calibration button A5 DIP2 ToleranceB Digital Tolerance set LSB A6 DIP1 ToleranceA Digital Tolerance set MSB A7 Lamp Digital Front panel lamp B0 Indicator 1 Digital Onboard indicator (last pulse was low on gas) B1 Indicator 2 Digital Onboard indicator (last pulse was had enough gas) B2 Sounder Digital Front panel sounder B3 'Reset Digital Reset IC Release Notes Date 4/10/2022 --------------- - Initial release version Date 28/10/2022 --------------- - Connected spare IC pin A3 to DIP4 this will allow the sounder auto silence to be enabled or disabled - Adjusted pulse speed so lamp flashes at the same rate as sounder pulses - Adjusted resistor values to fit availability - Added momentary GAS button to simulate gas pulse Date 6/11/2022 --------------- - Fixed problem where button press starts silent alarm timer Date 24/1/2023 -------------- - Added watchdog reboot functionality - Added button press to blink indicator once to show user cpu is still working Date 5/2/2023 -------------- - Changed watchdog register to show reason for last reset.
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