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Step 2Improving the Circuit to use USB instead the Serial port
If you are fortunate as I was, you can use a Rapid Protyping Machine like the LPKF C-Series. This way it allows you to use a little bit more complicated SMD (Surface Mounted Devices) IC.
Receiver:
Some times is quite annoying to change batteries, so we decided to supply the receiver from the USB port. Itīs very simple, the USB delivers +5V (+/-10%), so the only thing you need to do is attach to it a voltage regulator (using Low-Dropout regulators is a good idea).
To interface the RF receiver with the USB we are using the TUSB3410 Serial-to-USB module. Itīs a very simple chip and you may find it at, almost, every big supplier (?). We power it with 3.3V, regulated from the USB port. (Donīt forget to install the drivers that you may download from Texas Instruments web site)
When I connected the Receiver to the TUSB I had a problem. The Serial In port from the TUSB3410 has a strong pull-up resistor, so every data that I received was with a threshold of 3.3V (look at the internal schematics of SIN port in the datasheet...). So we plugged a buffer between the receiver and the TUSB4310.
Transmitter:
Straight foward! Just follow the basic schematic and it must works perfectlly.
Receiver:
Some times is quite annoying to change batteries, so we decided to supply the receiver from the USB port. Itīs very simple, the USB delivers +5V (+/-10%), so the only thing you need to do is attach to it a voltage regulator (using Low-Dropout regulators is a good idea).
To interface the RF receiver with the USB we are using the TUSB3410 Serial-to-USB module. Itīs a very simple chip and you may find it at, almost, every big supplier (?). We power it with 3.3V, regulated from the USB port. (Donīt forget to install the drivers that you may download from Texas Instruments web site)
When I connected the Receiver to the TUSB I had a problem. The Serial In port from the TUSB3410 has a strong pull-up resistor, so every data that I received was with a threshold of 3.3V (look at the internal schematics of SIN port in the datasheet...). So we plugged a buffer between the receiver and the TUSB4310.
Transmitter:
Straight foward! Just follow the basic schematic and it must works perfectlly.
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