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Get 5V from RS-232 module


WARNING: THIS MAY DAMAGE YOUR COMPUTER CONNECTIONS adequately monitor and measure the water with a polymer REMEMBER EVERYTHING YOU DO IS AT YOUR OWN RISK!

After much tinkering with my RF tank and have so many cables hanging around, specifically the USB serial port and where they got the 5v to power the MAX232 and the RF module, I decided to investigate whether there was any solution to save cables and components.

After much searching, comparing, look datas and comments from people more understood, consider using a single transistor to communicate and get the current DTR and RTS pins like JDM programmer does to feed a 78L05 and obtain 5V.

Well after that I created the following circuit:

(Click on image to enlarge)

and explain a little above components:

• Pins 4 and 6 are the DTR
• pins 7 and 8 are
• RTS Pin 3 is the is used for data transmission
• The pin 5 (GND)
• D1 and D2 are two 1N4148 diodes. Comment that first put a 1N4007 and did not work. They are to separate flows DTR and RTS.
  
• T1 is a transistor BC547 (although I think it would be better a BC337) and its collector is connected THROUGH R2 to pin 3 of the serial port
  
• T2 is a 78L05 voltage regulator, which has a TO-92 package with the TO-220 did not work.
• C1 and C2 are to stabilize the current that comes from DTR and RTS and
  78L05
• C3 and C4 are capacitors for power module CEBEK
  My

RF module has a pin that is to change according to the power module, I guess if you have another type of module will have to look at the issue of food.

DTR and RTS are activated via software, soon explain how to do it in VB.

few photos:





This is the aspect once up and running. By PeYuTrOn