Connecting Parallax's 433MHz Transmitter and Receiver On the PC Side
Bill Chennault
Posts: 1,198
All--
I would like to replace my PC's Bluetooth (eb501) connection to my robot with Parallax's 433MHz transmitter/receiver pairs. It looks fairly straight-forward on the SX or Stamp side (just plug'em in, add power·and jumper the correct pins?), but I do not know how to do it on the PC side.
I do not have a single serial port in the house. But, I do have plenty of USB2SER adapters. My thoughts are to stick the 433MHz pair in a breadboard, build the voltage level shifter, and connect that assembly to the PC via USB2SER.
"Voltage level shifter." I understand what it does in the conversion of the PC's RS232 level signals to the TTL level voltage necessary for the 433MHz parts, but I do not know HOW to do it. I would love two things: Advice on which IC to use (the MAX232 will certainly work, but I would like a faster baud rate) and a schematic. (Gee. It would be a dream come true if I had a schematic showing a PC serial port connected via the voltage level shifter to the Parallax 433MHz transmitter and receiver!)
Will you help?
Thanks!
--Bill
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You are what you write.
I would like to replace my PC's Bluetooth (eb501) connection to my robot with Parallax's 433MHz transmitter/receiver pairs. It looks fairly straight-forward on the SX or Stamp side (just plug'em in, add power·and jumper the correct pins?), but I do not know how to do it on the PC side.
I do not have a single serial port in the house. But, I do have plenty of USB2SER adapters. My thoughts are to stick the 433MHz pair in a breadboard, build the voltage level shifter, and connect that assembly to the PC via USB2SER.
"Voltage level shifter." I understand what it does in the conversion of the PC's RS232 level signals to the TTL level voltage necessary for the 433MHz parts, but I do not know HOW to do it. I would love two things: Advice on which IC to use (the MAX232 will certainly work, but I would like a faster baud rate) and a schematic. (Gee. It would be a dream come true if I had a schematic showing a PC serial port connected via the voltage level shifter to the Parallax 433MHz transmitter and receiver!)
Will you help?
Thanks!
--Bill
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
You are what you write.
Comments
Referring to USB2SER can often be ambiguous in regards to the signal type. The USB2SER device that Parallax sells would not require any level conversion to use with the RF Transmitter and RF Receiver. However, the USB to 232 (which you may actually be referring to) would. Example circuits for converting TTL to RS-232 and back are listed in the Complete Projects Forum under Official Parallax Projects. I hope this helps. Take care.
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Chris Savage
Parallax Engineering
That DOES help a lot.
Thank you.
--Bill
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
You are what you write.