Chasing the HHO outputs:
After preparing the HHO control unit and finishing the assembly of our HHO cell, we decided to make a LCD screen to get some outputs from the system. The figures that we interested to know are data like PWM duty cycle and frequency (so that we can test different PWM configuration during the same test run, maybe even to run program for self finding the best frequency),the current load of the system, the throttle status and additional data that might pop up in the future. Moreover we added 8 buttons for control possibility of the HHO cell so that we can change work modes and adjust the cell’s work during testing and without reprogramming.
For that purpose we got a 4 lines x 20 letters LCD and prepared a nice case for it.
The ingredients of our HHO screen:
- LCD screen 4x20. Quantity: 1.
- buttons for system control. Quantity: 8.
- black sunglasses case. Quantity: 1.
All the buttons are normally open. The screen connects to the HHO control unit using printer cable, screen uses 8 + 3 pins to receive signal from the unit.
After a very week or so of experimenting, we got the desired results from the screen (Screen data are fictional only for experiment):
Take a look at the guts of this baby:
Next mission is to place the screen in the passenger compartment and use it to find the best work point for our HHO cell. Meanwhile we consider to connect our HHO control unit to the ODB-2 port of the car and use it to receive vital data from the car’s computer like fuel consumption, RPM and so on. With an ODB-2 connection we will be able to use all the data that presented using Scangauge II for effectiveness calculations. To do this we will need to program an interface to ODB-2, Lot of work but for now it seems inevitable…:]