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hi daniii
if you have not enough knowledge about USB communication, its better to use USB to UART ICs to send and receive data over USB.
then you can use a low cost MCU without USB module.
PIC16F877A has an internal USART module that will do all of things that you need.
you should only configure USART of PIC16F877A and define a simple communication protocol.
if you are using MicroC, you can use library functions to setup an UART communication (its the simplest manner).
hi
1- in your code there is not any delay for charging S/H capacitor on second channel.
i think that you inserted "__delay_ms(20);" for this, but you should
insert delay after selecting a channel (not before it).
2- don't set ADON bit and GO/DONE bit in same instruction. first set ADON and then...
it depends on "If" condition. if your condition need some calculation, the needed clock cycle will be more than a simple decision.
for example, processing of "if((X/Y)>=45.678)" need more clock than "if(PORTA.B3)".
if you want to know exact values, you can see "Listing" (view>Listing). in...
but how can i calculate mismatch? i have not any professional measurement instruments. also i am not familiar in RF domain.
is there any way to design a practical small antenna without involving such measurement and heavy calculations?
i think that after last state (timer stop), you should reinitialize timer and wait for initial condition again:
-1- Wait for Initial condition
-2- Timer Start
-3- Timer Stop
-4- Capture timer value
-5- Show measured time
-6- Reinitialize timer value
-7- Go to -1-
First i should say that i am not an RF expert. I used RFM22B (si4432) RSSI register to measure RSSI. I read the register just after detecting preamble and i got a value about E0h that according to "RSSI vs Input Power" curve in SI4432 datasheet, the input power should be about -3dBm.
when i...
i think that you can use PIC MCUs with CTMU modules.
"The Charge Time Measurement Unit (CTMU) is a flexible analog module that provides charge measurement, accurate differential time measurement between pulse sources and asynchronous pulse generation."
in datasheet it mentioned that the...
hi.
i am using RFM22B-433-D (an RF module base on SI4432-revB1 that operate in 433MHz band and has DIP package).
DIP package of RFM22B has a little ground plane (with respect to SMD packages). and under some of the components, there is not any ground plane.
and also my circuit PCB has not a good...
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