jaydag71
New Member
Hi again all, this may be a very stupid question but I am confused due to conflicting infos I have gathered which all use different parts to accomplish the same or similar result!
I am trying to build a small daughter board for these old stock RF modules (Linx TXM//RXM-433-LC(S)),, I have found some useful links which illustrate interfacing the modules with a micro, but most use different methods and parts.
The purpose will be simple remote control 'mode' for a minisumo bot. The transmitter will be a unit similar to a PS2 controller. The receiver data will go into the mainboard's PIC. I was thinking about using a hex inverter as it seems to be a common method. My issue is that out of three designs I'm looking at currently which all use an inverter, each selects to use a different variation of inverter...ie. 1 uses the 74LS04, next uses the 74HC04, and other uses the 74HCT04. There is limited info about why each has selected their choice, but the LS design does talk about the pic it is interfaced to (UART) using TTL. I had thought that the PIC was a CMOS device though, so this adds to my confusion. I have browsed through the ref man UART section to find more info but have found none. I assume that each has worked out else they would have used something else, but my question is which is the best device variety to go with??? I have some HC's here and also some LS but would need to buy some HCT's if they are the best way to go,, so things are on hold untill I can settle this little issue!! helpz?
PS my design will use 5V for the RF and micro. Thanks in advance for any help clearing up this stupid confusion. jd
I am trying to build a small daughter board for these old stock RF modules (Linx TXM//RXM-433-LC(S)),, I have found some useful links which illustrate interfacing the modules with a micro, but most use different methods and parts.
The purpose will be simple remote control 'mode' for a minisumo bot. The transmitter will be a unit similar to a PS2 controller. The receiver data will go into the mainboard's PIC. I was thinking about using a hex inverter as it seems to be a common method. My issue is that out of three designs I'm looking at currently which all use an inverter, each selects to use a different variation of inverter...ie. 1 uses the 74LS04, next uses the 74HC04, and other uses the 74HCT04. There is limited info about why each has selected their choice, but the LS design does talk about the pic it is interfaced to (UART) using TTL. I had thought that the PIC was a CMOS device though, so this adds to my confusion. I have browsed through the ref man UART section to find more info but have found none. I assume that each has worked out else they would have used something else, but my question is which is the best device variety to go with??? I have some HC's here and also some LS but would need to buy some HCT's if they are the best way to go,, so things are on hold untill I can settle this little issue!! helpz?
PS my design will use 5V for the RF and micro. Thanks in advance for any help clearing up this stupid confusion. jd
