Home Automation V-2

This board will remove drawback found in previous board and will improve the performance to do more.

High voltage (220V) relay module get separated from main board for safety, Relay module will be put in the switch box. 

A buzzer was added to pin number 23.

ESP 32 power up using 3.3 V LDO that separately connected to battery charging module.

Logic level converter HV side powered up with 5.0 V.

 

 

Several output pins have been changed as follows  

 

 

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MOSFET DRIVER PCB

Four MOSFET Driver PCB

 

 

 

Single side PCB with six air wires 

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Double distilled water for laboratory use

There are basically de-ionized water (diH2O), distilled water (dH2O) and double-distilled water (ddH2O) that use in the laboratory.

 

diH2O water, as the name suggests, has had the charged molecules (ions) in the solution removed by filtration through a bed of ion exchange resins. These small plastic beads with a positive or negative charge, attract the undesirable molecules and replace them with either a H+ ion or an OH- ion, which combine to form pure water. The process does not remove anything without a charge, including viruses and bacteria. diH2O, due to the lack of ions, has very low electrical conductivity. The process is relatively inexpensive, as there is minimal hands-on time, the plastic beads can be ‘recharged’ multiple times with strong acids and bases, and the tanks require infrequent cleaning.

 

dH2O is produced by heating water to boiling and gathering the resulting water vapor in a clean container. Any contaminants and undesirable molecules are left behind in the original container as precipitated solids. The boiling process sterilizes the water, meaning viruses and bacteria are killed during the procedure. It is the oldest method of purification and is still in common usage. However, some dissolved impurities can have a lower boiling temperature than water and may be gathered in the secondary container along with the purified water vapor. The distillation process requires more hands-on time and cleaning of the solid contaminants out of the distillation chamber after every procedure, which can be challenging or even hazardous depending on the initial cleanliness of the water.

 

ddH2O is traditionally considered the ‘most pure’ type of laboratory-grade water. This is simply the secondary distillation of the water vapor of a prior distillation procedure. This process is the most time-consuming out of the three and does not necessarily avoid the risks of potential impurities being carried along with the vapor.

 

 hear is the basic flow diagram of double distillation process..