Most of the people complaining that they can not connect there microcontrollers to PC. The reason for this in many occasions , is wrong pin connections between MAX232 IC and PC and also MAX232 IC with microcontroller. Here you can see very clear diagram , which explain all the story between PC- MAX2...

Can you did the number one step of my above post and tell us the results

Now you have three more things to do. 1. remove the cable from the PC and directly short the Pin 2 and Pin 3 of your computer serial port. And as you did , write someting on the hyperterminal and see , wheter you can see what you are typing. This test has no effect of the cable and if this fail , we...

Dear Friend ,

You have shorted Pin 3 and Pin 4. You have to shorted Pin 2 and Pin 3. You can see pin numbers in the port with
small letters. Please see those and select the correct pins.

Short the two pins , which are in black border box in below diagram.

Most of the times , when we are design electronic circuits , we have to use both 5V and 3.3 V. Because some electronic components working in 5V and some are in 3.3 V. LM3940 is a low cost , but good regulator , which input 5V and output 3.3 V. So it will easy to work with this IC , when we have to w...

You have experinecd in lots of time , that microcontrollers are getting restart or stuck time to time. This condition can see , specially in industrial environments. Because there are lots of noises adding to the MCU power supply in such environments basically due to electro magnetic interferences. ...

Dear Friend , According your pin diagram in serial port , it seems , either your pin diagram wrong or serial cable is incorrect. As those are standard serial cables in the market , most probably the diagram could be wrong. I am sure what view you have drawn of your male and femal ports. Always draw ...

Dear Friend , if you have some problem with serial port , there is a easy way to test the serial port. Open the hyper terminal program in Windows ( Accessories -> Communication -> Hyper Terminal) with default settings. Plug the serial cable , to the respective serial port , you select for hyper term...