Theory, hardware, software and code
Buying from e-bay a common valve usually is not gravity feed.
Needs a lot of pressure in order to allow the water to flow when the coil is energized.
The tools that we are going to need in order to make this modification are :
A glue gun
A straw
A water bottle
Tape
A diode
A screw driver
A dremel with 1.7 mm drill bit
A 12V 1A AC to DC adapter / power supply
...continue reading "Converting a normal water valve into a gravity feed valve"
In this third and last article of this series we will add two libraries in our Lazarus project and the event handling.
The compiled project can be found at TrustFm website.
We are going to use the synaser library (part of synapse) for the serial communication and the PlotPanel in order to plot our real time graph.
For synaser we are going to add only the "synaser.pas" file into our project.
For the PlotPanel we need to add the "plotpanel.pas" file into our project.
More informations for synaser can be found here and for PlotPanel here
...continue reading "Designing the software data logger for MASTECH MS8229 part2"
In this short post we will see how to do a measurement of resistance when you have to test a grounding system and how to do a ground resistance measurement.
**Little theoretical summary**
One of the major causes of injuries and danger in the electrical systems are high failure voltages (rated value of the system plus the power surge), due to generally high failure current (look at this post) of systems. Those currents are usually drained to ground by grounding systems. It's easy to understand why you want the lowest resistance possible in the grounding system, merely:
RG = UG / IF (1)
...continue reading "How to do a soil/grounding system resistance measurement"