:: Common Grounds? - NEW INFO WITHIN::
Hey there
im programming my PIC16F877A on a breadboard using ICD2 and a suported programmer...(which is powered by USB)... when i power the WHOLE BREADBOARD by my 5way ICSP connector its fine,and as i am interfacing to my pic...serial communication thru the form of a USB->SERIAL adaptor...and then taking the TRANSMIT pin to my RX pin... and the ground pin of serial plug to my BREADBOARD gnd... it all works fine... i can send hex values over 2my pic without a problem.
The reason i believe is becuase the USB ground is its COMMON GROUND...hence it works...
BUT for my project i will b powering through 240v - down to 5v... and when i plug "my" 5v power supply to the board, along with the serial line and its asscoiated ground, the pic doesnt like it... this is not just due to my pwoersupply, off the shelf 5v power supplies i have tried, with the same effect, the pic will only like it if its POWERED by the same GND as the transmission..
anyway around this?...for testings my transmission is wired... but in the end its gonna be an RF link... so my problem MAY be solved when i do this?
as i will have the transmitter on a small pcb board connected to the USB port of the pc...and the RF reciever will be powered by "MY" powersupply... does this make sense to you?
Hey there
im programming my PIC16F877A on a breadboard using ICD2 and a suported programmer...(which is powered by USB)... when i power the WHOLE BREADBOARD by my 5way ICSP connector its fine,and as i am interfacing to my pic...serial communication thru the form of a USB->SERIAL adaptor...and then taking the TRANSMIT pin to my RX pin... and the ground pin of serial plug to my BREADBOARD gnd... it all works fine... i can send hex values over 2my pic without a problem.
The reason i believe is becuase the USB ground is its COMMON GROUND...hence it works...
BUT for my project i will b powering through 240v - down to 5v... and when i plug "my" 5v power supply to the board, along with the serial line and its asscoiated ground, the pic doesnt like it... this is not just due to my pwoersupply, off the shelf 5v power supplies i have tried, with the same effect, the pic will only like it if its POWERED by the same GND as the transmission..
anyway around this?...for testings my transmission is wired... but in the end its gonna be an RF link... so my problem MAY be solved when i do this?
as i will have the transmitter on a small pcb board connected to the USB port of the pc...and the RF reciever will be powered by "MY" powersupply... does this make sense to you?
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